Redarc Tow-Pro Liberty EBRH-ACCNA User manual

Electric Trailer Brake Controller
12 Volt, 1 or 2 Axles
AL-KO ESC &
DEXTER DSC
APPROVED*
PROPORTIONAL
with ACTIVE CALIBRATION
LIBERTY
Suits 12V negative Ground systems
*Some Dexter systems may require a load resistor

2
TOW-PRO®LIBERTY PROPORTIONAL TRAILER BRAKE CONTROLLER
The Tow-Pro®Liberty is a proportional electric trailer brake controller designed to suit
most common trailer braking applications while requiring minimal dash space and being
simple to install and operate.
The Tow-Pro®Liberty features Active Calibration which constantly monitors the direction
of travel and will even calibrate with no trailer attached whilst maintaining the ability
to mount in any orientation. On vehicles which only activate the trailer lighting circuits
when a trailer is detected by the vehicle, calibration will commence immediately a trailer
is detected.
The unit is able to operate electric or electric over hydraulic trailer brakes from 12V
vehicle systems without the need for manual selection or extra components.
WARNINGS & SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS - THIS MANUAL CONTAINS IMPORTANT SAFETY INSTRUCTIONS
FOR THE TOW-PRO®LIBERTY PROPORTIONAL TRAILER BRAKE CONTROLLER.
DO NOT OPERATE THE CONTROLLER UNLESS YOU HAVE READ AND UNDERSTOOD
THIS MANUAL AND THE CONTROLLER IS INSTALLED AS PER THESE INSTALLATION
INSTRUCTIONS.
PLEASE ENSURE INSTRUCTIONS ARE PASSED ON TO END-USER
THIS PRODUCT MAY CONTAIN CHEMICALS KNOWN TO THE STATE OF CALIFORNIA TO
CAUSE CANCER AND BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.
ENSURE THAT YOUR TRAILER BRAKES ARE INSTALLED AND ARE OPERATING CORRECTLY:
IMPROPERLY INSTALLED AND/OR FAULTY TRAILER BRAKES CAN CAUSE ERRATIC VEHICLE
OR TRAILER BEHAVIOUR WITH THE POTENTIAL TO CAUSE A ROAD ACCIDENT. FOR THIS
REASON, IT IS OF UTMOST IMPORTANCE THAT YOUR TRAILER BRAKING SYSTEM BE
INSTALLED/MAINTAINED BY A QUALIFIED INSTALLER.
ALWAYS CHECK BRAKES AT LOW SPEED EACH TIME A TRAILER IS ATTACHED TO YOUR
VEHICLE.
1. Ensure that the Tow-Pro®Liberty is installed inside the vehicle cabin and away
from any environmental conditions that may cause damage, including engine
heat, submersion in water, salt spray, dripping water and humidity. Exposure
to these conditions may cause damage to the unit’s circuitry and may cause
erratic trailer braking.
2. Ensure that the Tow-Pro®Liberty is mounted securely in a fixed location.
Failure to mount securely will result in inaccurate braking force measurements
and incorrect braking of the trailer.
3. A Fuse or Circuit Breaker of appropriate rating (see section 2.2.2) must
be installed to protect the vehicle system. Please refer to the installation
instructions (section 2) for specific instructions on where to install the Fuse or
Circuit Breaker and for appropriate Fuse or Circuit Breaker rating. The Fuse or
Circuit Breaker must be installed as close as possible to the battery.
4. Ensure the remote head push-button activates correctly when installed into
surfaces with a thickness greater than 0.12” / 3.0mm. Failure to activate
correctly would result in not being able to activate the override function.
5. Ensure that the wire(s) and all connections used to install the Tow-Pro® Liberty
are suitably rated to supply the required current to simultaneously operate the
trailer electric brakes and stop lamps, Please refer to the wiring gauge guide
on page 6. Incorrect wiring can result in reduced (or total loss of) trailer braking
and/or damage to property or persons.
6. The Tow-Pro®Liberty is suitable for all trailers fitted with electric brakes with
up to two axles.
1. Ensure that a correct grounding point is used. Vehicles often have ungrounded
metal reinforcements under the dash and these points are not suitable
grounds. Poor grounding of the unit will result in poor or no operation.
2. Do NOT exceed Tow Vehicle and Trailer weights and specifications. Failure
to abide by the towing regulations, including maximum loads, may result
in a fine, or in case of an accident, refusal of the insurance claim, and the
possibility of further legal action.
3. If the tow vehicle or trailer’s maximum load is exceeded, police and transport
authorities have the power to order the combination off the road until the issue
is corrected. This may necessitate leaving the trailer on the side of the road
while a vehicle with suitable towing capacity is sourced or the trailer load is
reduced. Please contact your local authorities for further information.
4. If no trailer is connected, Active Calibration may occur as normal without
any indication from the LED. The LED will already be Blue when the trailer
is connected. Essentially, whether a trailer is connected or not, just drive
normally and Active Calibration will ensure the Tow-Pro®Liberty learns the
correct direction of travel.
5. Do NOT install the Remote Head in any location that may impede the activation
of vehicle air-bags.
6. The State of California regulations require that the manual override function
illuminates the trailer brake lights. Once the TowPro Liberty is installed it
should be tested with your vehicle to confirm the wiring configuration to make
sure the brake lights are illuminated when the override button is pressed.
1 SPECIFICATIONS
Part Number EBRH-ACCNA
Operating Voltage 9V - 16V
Nominal Input System Voltage 12V
Brake Input Signal Voltage OFF: 0V
ON: +12V nominal
Brake Coil Voltage 12V
Max. Trailer Axles 2 Axles
Nominal Current Draw 12A
Max. Rated Current 18A
Standby Current <5mA
Operating Temp -4°F to 140°F
-20°C to +60°C
Weight 7oz / 200g
Warranty 2 years
Kit Contents
1. Remote Head Assembly
2. Main Unit
3. Remote Head Nut
4. Remote Head Knob
5. Remote Head Bezel
6. Remote Head Cable (3’-3”/1m)
Dimensions & Connection
1.2in
30.0mm
0.4in
10.0mm
0.4in
10.0mm
Brake
Lights
(RED)
Input
Power
(BLACK)
Ground/
Earth
(WHITE)
Brake
Output
(BLUE)
Remote Head
Connection
0.9in
23.7mm
0.7in
19.0mm
(Recommended)
0.5in
11.5mm
0.8in
20.0mm
0.8in
20.0mm
1.7in
43.5mm
1.8in
46.5mm
2.9in
74.0mm
2.6in
67.0mm
3.3in
84.5mm
1.1in
28.8mm
4.1in
104.0mm
3.9in
100.0mm
EBRH-ACCVNA Instruction Manual – Version 1
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2
4
3
5
6

3
2 INSTALLATION
2.1 Mounting the main unit
The Tow-Pro®Liberty should be mounted inside the vehicle cabin using either M4
screws or other secure fitting methods at the mounting points provided. It is essential
to mount the unit in a location which allows access to the intended remote head
location via the included remote head cable.
The Tow-Pro®Liberty can be mounted in any orientation as long as the installation
is secure and the main unit cannot move or change orientation once installed. A
change of orientation will affect the system calibration.
Ensure that the Tow-Pro®Liberty is mounted securely in a fixed
location. Failure to mount securely will result in inaccurate braking force
measurements and incorrect braking of the trailer.
Ensure that the Tow-Pro®Liberty is installed inside the vehicle cabin and
away from any environmental conditions that may cause damage, including
engine heat, submersion in water, salt spray, dripping water and humidity.
Exposure to these conditions may cause damage to the unit’s circuitry and
may cause erratic trailer braking.
Do Not Mount to Cables / Wiring Looms
Any Secure Orientation OK
2.2 Wiring the brake controller
The Tow-Pro®Liberty is sold without a wiring harness.
REDARC Electronics manufactures a universal wiring harness, as well as a number of
vehicle-specific wiring harnesses for quick and easy installation.
For older vehicles not covered by our range of wiring harnesses where a custom
installation is required, the TPH-025 ‘Universal Harness’ should be used. Please follow
the subsequent instructions for all custom installations.
A Fuse or Circuit Breaker of appropriate rating must be installed to
protect the vehicle system. Please refer to the installation instructions for
specific instructions on where to install the Fuse or Circuit Breaker and
for appropriate Fuse or Circuit Breaker rating. The Fuse or Circuit Breaker
must be installed as close as possible to the battery.
Ensure that the wire(s) and all connections used to install the Tow-Pro®
Liberty are suitably rated to supply the required current to simultaneously
operate the trailer electric brakes and stop lamps. Incorrect wiring can result
in reduced (or total loss of) trailer braking and/or damage to property or
persons.
2.2.1 Red Wire (Vehicle Brake light) Connection
The requirements for a suitable connection of a brake controller trigger wire are quite
specific. This connection point must:
• Provide ‘Start Battery’* voltage output while the vehicle brakes are applied.
• Have 0 volts output while the vehicle brakes are not applied
• Accept battery voltage input when the brake controller manual over-ride is
operated and illuminate at least the trailer brake lights.
• Accept the battery voltage input as above without causing any damage,
spurious vehicle operation or erroneous fault indication.
A relay should not be installed to drive the red wire as this would prevent the override
feature from working and may introduce dangerous voltage spikes.
For many vehicles, the brake light terminal of the trailer lighting socket provides
a suitable connection, however this is not necessarily suitable for all vehicles.
Unfortunately REDARC cannot recommend where to make this connection on a specific
vehicle’s OEM wiring. For further information contact the vehicle manufacturer.
* Start Battery voltage output means, directly from the Start Battery and within 0.4V of
Supply (Black wire) voltage.
2.2.2 Wiring Diagrams - Electric Brakes
The Tow-Pro®Liberty is designed to operate electric brakes in 12V electrical systems
only. For wire selection refer to the wiring gauge guide in Section 4.
The Input Power (Black) wire must be connected directly to the positive
terminal of the start battery via a Fuse or Circuit Breaker and not through
an Ignition source.
14AWG / 1.6mm²
To 12V Vehicle
Brake Light trigger
(refer to Section 2.2.1)
To 12V Electric
Trailer Brakes
Blue
Red
30A Fuse or
Circuit Breaker
(CBK30-EB)
12V Vehicle
Start Battery
Ground
Black
-
Dash mount
controls for
Tow-pro.
14AWG / 1.6mm²
12AWG / 3.0mm²12AWG / 3.0mm²
White
2.2.3 Wiring Diagrams - Electric / Hydraulic Brakes
Always refer to the manufacturer’s specifications for your Electric/
Hydraulic Braking system prior to installation and usage of the Tow-Pro®
Liberty.
Electric / Hydraulic Trailer Brake Systems
The Tow-Pro®Liberty is designed to operate both Electric trailer brake systems and
Electric / Hydraulic trailer brake systems. However, most Electric / Hydraulic systems
require a separate 12V power feed for the hydraulic pump. For example:
Electric / Hydraulic
System
12V Start Battery Power Supply for
Electric/Hydraulic System
Output Wire (Blue)
Tow-Pro
Brake Signal
For wire selection refer to the wiring gauge guide in Section 6.
2.2.4 Wiring Diagrams - Vehicles with CAN Bus System
Many modern vehicles use a CAN Bus system for signalling when to apply the vehicles
brakes as required by safety systems including adaptive cruise control, stability
control, Autonomous Emergency Braking (AEB) and hill descent control. For these
vehicles, REDARC recommend the following wiring configuration.
White
To Vehicle Brake Light
Trigger
To Pin #6 of the
Trailer Plug
Blue
Red
30A Circuit Breaker
(CBK30-EB)
To Vehicle
Start Battery
Black
Dash mount
controls for
Tow-pro.
To Chassis Earth Bolt
Brake Signal Source
Brake Light Terminal of Trailer Plug
REDARC recommend sourcing the brake signal from the brake light wire of the trailer
plug as it will capture all braking events that illuminate the trailer brake lights.
Please note that if the brake signal is sourced at the trailer plug, a suitably rated* diode
MUST be fitted to the vehicles brake light wire on the vehicle side, the point where the
brake signal is sourced.
*The diode rating must at least match the total stop lamp(s) load on the trailer circuit.
Trailer Brake
Light Wire
from Vehicle
Tow-Pro Elite
Brake Signal Wire
Trailer Plug
Brake Light Wire
This prevents the back feeding of 12V into the vehicle when the Tow-Pro is manually
activated whilst illuminating the trailer brake lights.
Brake Pedal Switch
Sourcing the brake signal at the brake pedal will only detect braking events when
the brake pedal is depressed (and the switch activated) and not brake applications
activated by other on board systems such as AEB. Note: Only connect to the brake
pedal switch if specified by the vehicle manufacturer.

4
2.3 Mounting the Remote Head Control Knob
The Tow-Pro®Liberty remote head is designed to be mounted at a distance from
the main unit, allowing for a neat, convenient installation and not impeding on lower
leg airbags or driver leg room. The Tow-Pro®Liberty remote head is designed to be
mounted on or around the vehicle dashboard and when installed correctly, complies
with Federal Motor Vehicle Safety Standards No. 201, which sets requirements for
devices mounted on the dashboard.
The Tow-Pro®Liberty remote head can be mounted directly to the dashboard, to the
centre console or through a spare knock-out switch panel and requires two holes to be
drilled as per the Mounting Guide below. For easy access in an emergency situation,
REDARC recommend installing the remote head within reach of the driver such as the
regions shaded in the diagram below.
2.4 Remote Head Mounting Guide
2
Place bezel (optional)
to cleaned surface
4
Turn shaft fully anti-clockwise
3
Insert Remote Head shaft through
the hole and fasten with nut
Torque to 0.6 ft lb / 0.8Nm
1
Drill Ø3/8” / Ø10.0mm
mounting hole
Ø1/8”
(Ø3.5mm)
Ø3/8”
(Ø10.0mm,
drill pilot
hole first
or use a
spade bit)
0.3” (7.5mm)
0.08 - 0.12”
(2.0 - 3.0mm)
6
Test installed remote head
for correct function
5
Apply knob with ‘0’ aligned
to level marker on the bezel
Level marker
Ensure the remote head push-button activates correctly when installed into surfaces
with a thickness greater than 0.12” / 3.0mm. Failure to activate correctly would result
in not being able to activate the override function or change modes.
Do NOT install the Remote Head in any location that may impede the activation of
vehicle air-bags.
2.5 Installation Accessories
REDARC offer a range of vehicle specific switch inserts and
vehicle specific wiring kits designed to make the installation of
the Tow-Pro®Liberty easier.
The range includes most popular SUV & LCV’s and is frequently
being updated and added to. A full listing of Switch Inserts and
Wiring Kits is available online and can be purchased from the
REDARC website.
Please visit redarcqr.com/electricbrakes or follow the QR code for a
direct link to the appropriate page.
2.6 Active Calibration
Active Calibration constantly monitors the vehicle’s direction of travel and allows the
Tow-Pro®Liberty to ‘learn’ and continuously confirm its mounting orientation. This
process occurs whilst the vehicle is moving and the brake is applied and will occur
with or without a trailer connected, for most vehicles.
When the unit is first powered, Active Calibration must first become confident
in the vehicle direction of travel. Until this time the LED will flash Blue/Green.
Time Time
During Calibration: Once Calibrated:
When the Tow-Pro®Liberty is first installed it will begin learning its mounting
orientation through Active Calibration as soon as you start driving.
Until the Tow-Pro®Liberty has fully determined its mounting orientation the unit will
apply the brakes based on the level set on the control knob, this is indicated by the LED
glowing green with blue flashes. As the Tow-Pro®Liberty becomes more confident of
its direction of travel the length of the Blue flash will increase, to the point that the LED
is solid Blue which indicates it is now calibrated.
Under normal driving conditions the Tow-Pro®Liberty will learn its mounting orientation
within 20 brake applications. Note that the braking must be perceptible (applying the
brake while stopped will not assist calibration).
If power is disconnected (for example, if the vehicle battery is changed) calibration
memory will be lost and the unit will recalibrate itself using active calibration. This is
similar to a radio losing its clock or preset station memory.
If no trailer is connected, Active Calibration may occur as normal without any indication
from the LED, provided your brake light trigger point is active when there is no trailer
attached. The LED will already be Blue when the trailer is connected. Essentially,
whether a trailer is connected or not, just drive normally and Active Calibration will
ensure the Tow-Pro®Liberty learns the correct direction of travel.

5
3 OPERATION
3.1 Adjusting the Braking Force
The braking level can be adjusted to suit varying trailer loads, braking requirements
or user comfort by adjusting the control knob on the remote head.
The lower end of the scale (below level 5) should be used as a starting point and
adjusted accordingly once braking requirements are established.
If a lighter braking level is required, turn the control knob to a lower number
(anti-clockwise) to reduce the trailer braking force. Similarly, turn the control knob to
a higher number (clockwise) to increase the
trailer braking force.
The braking level will be indicated by the LED
changing from BLUE to a shade of RED when
the brakes are applied. The higher the braking
level, the more RED the LED will glow.
A setting of ‘0’ will result in no trailer
braking output, ie. no braking.
3.2 Normal Brake Application
Once calibrated, the Tow-Pro®Liberty
operates only in Proportional Mode, which is
indicated by a Blue LED color.
Proportional Mode means that the Tow-Pro®
Liberty will apply the trailer brakes at a level
proportional to the vehicle deceleration.
The control knob setting, 0 to 10, will set
the brakes from a lighter to a heavier trailer
brake application. Simply put, the harder
the vehicle is decelerating, the harder the
trailer will brake.
A setting of 0 will result in no braking.
3.3 Manual Override
Pressing the control knob whilst driving will
apply the manual override brake. The manual
override brake will apply the trailer brakes
only; if wired correctly it will also apply the
trailer brake lights and will turn the LED
indicator a shade of RED. Depending on the
vehicle wiring it may possibly also apply the
vehicle brake lights. The manual override is designed to be used when the trailer
brakes need to be applied without the vehicle brakes, such as correcting trailer
‘sway’ whilst travelling.
The manual override will apply the trailer brake to a level equivalent to ‘light’ vehicle
braking, which is sufficient to pull the trailer back into line.
The braking force can be adjusted by turning the control knob, either higher or lower,
even whilst applying the manual override brakes.
Manual override should not be used in place of the regular vehicle brakes.
3.5 LED Indication
The Tow-Pro®Liberty will indicate both Mode and Fault Condition through colour and
flash sequences of the LED indicator. The table below shows how the Tow-Pro®Liberty
will indicate Normal Operation of the unit.
NOTE: LEDs will glow full brightness when control is adjusted or manual override
is pressed. After release of the control knob the LED brightness will reduce. This is
designed to be less intrusive on driver’s vision at night.
Status Indication
Calibration Blue/Green flashing
Sleep Mode1Blue Breathing once with button push2
Trailer Connected Solid Blue
Braking Blue to Red3
Fault Code
(trailer braking
performance potentially
compromised)
Flashing in any sequence (other than Blue/Green)
Please refer to troubleshooting section (Section 3.6) or
contact an experienced auto-electrician.
1. Sleep Mode occurs when there is no trailer connected to the vehicle.
2. Breathing, as opposed to flashing, is the LED gradually getting brighter until
its brightest point and then gradually dimming until off. In the event of trailer
disconnection, breathing will occur, with a button push, after 1 minute.
3. The LED will vary between the Blue and Red depending on the braking force.
3.4 Park Brake Feature
If the Tow-Pro®Liberty detects that the vehicle brakes are applied for longer than 3
seconds whilst the vehicle is stationary, it will apply the trailer brakes in an intelligent
manner to reduce the required braking effort whilst decreasing the risk of rolling
forward or backward whilst stopped. If the controller determines the trailer brakes
are not required to keep the vehicle stationary, the output will be decreased to Zero.
3.6 Troubleshooting
The Tow-Pro®Liberty features sophisticated diagnostics to warn the operator of faults
in the vehicle and trailer brake wiring. Wiring faults are indicated by a series of colour
coded flash patterns on the Tow-Pro®Liberty LED.
Most faults turn out to be something simple such as a poor connection from a dirty
trailer socket, however a fault indication should not be ignored! It is a warning; if left
unattended such wiring faults can become worse and may lead to deterioration or
loss of trailer braking.
Please refer to the table below for the list of flash patterns, showing the cause &
recommended course of action for each of the conditions which may be detected.
Even intermittent faults are detected and may be indicated until cleared.
Fault codes can be cleared by unplugging the trailer for 1 minute then reconnecting.
LED Sequence Symptom/Description Possible Cause Suggested Action
1 Second
BLUE Breathing when the
Override button is pushed
The trailer brakes have not been
detected
Check the trailer plug and all
connections between the controller
& brakes.
Time
Flashing a Blue/ Green
sequence.
The unit is in the process of
calibrating, this is NOT a fault.
Keep driving normally and the unit
will calibrate
1 Second
The LED is YELLOW and flashes
PURPLE twice
There is a fault with the unit and/or
the installation.
Check and clean trailer plug
connection. Please contact REDARC
or visit your local auto-electrician for
further assistance
1 Second The LED is YELLOW and flashes
RED once per second
There is a short circuit somewhere on
the brake output line (BLUE wire)
Check all wiring from the unit to the
trailer brakes for any wiring faults,
including at trailer plug
1 Second
The LED is YELLOW and flashes
RED twice per second
There is a short circuit somewhere on
the brake light circuit (RED wire)
Check all wiring from the unit
to the brake light trigger for any
wiring faults
1 Second
The LED is YELLOW and flashes
RED four times per second
There is a break/open circuit
somewhere along the Tow-Pro®
Liberty’s Ground circuit (WHITE wire)
Check all ground connections and
associated wiring for any wiring faults
1 Second The LED is BLUE and flashes
RED once per second when
vehicles brake not applied
The unit has detected that the Remote
Cable is faulty, or it is in calibration
mode with a permanent input on the
brake light trigger.
Check the Remote cable is fully
plugged in, otherwise replace; check
red wire has 0V when vehicle brake
is not applied.
1 Second
The LED is flashing RED
The unit has detected an internal fault
of your Al-Ko iQ7 hydraulic/pneumatic
system; or there is a voltage drop
between the trailer earth and the
vehicle earth.
Check for faults according to the
manual for the Al-Ko iQ7 actuator. If
you don’t have an Al-Ko iQ7, check
for suitable wiring on the trailer
Ground circuit.
1 Second
The LED is flashing GREEN only
whilst braking
Loss of supply power or Circuit
Breaker cycling
Check supply (BLACK) wire for good
connection & check circuit breaker/
fuse not blown and correct value
1 Second
The LED is flashing GREEN
at any time
Hesitation during connection of BLACK
wire possibly causing incomplete
startup sequence
Disconnect BLACK wire, wait 1
minute and reconnect BLACK wire
to the battery
1 Second
The LED is flashing GREEN
at any time or only when
not braking
Low continuous voltage on brake
light (RED) wire
Check that RED wire is connected to
a point that is 0V when the brakes are
off and 12V with the brakes applied
1 Second
The LED is flashing BLUE The power supply to the unit is
not stable.
Check the BLACK and WHITE wires for
loose connections
Time
The LED flashes an unusual
colour sequence randomly
whilst braking
There is a short circuit on the output
(BLUE) wire or the Fuse or Circuit
Breaker is overloaded
Check for short circuit on trailer brake
(BLUE) circuit, including moving brake
swing arms
Check that no other devices are
running from the same Fuse or Circuit
Breaker as the Tow-Pro®Liberty
Time
LED only lights up when
braking
The power wire is most likely not
connected brake light fuse may
have blown
Check supply (BLACK) wire for
connection problems and check circuit
breaker/fuse is not blown
Time
The LED is not working at all
There is a bad connection to the
trailer OR between the Main Unit and
Remote Head
Check the trailer wiring as the unit
is not recognising that a trailer is
connected AND that the RH cable is
correctly plugged in to both the Main
Unit and Remote Head.
1
Lighter
Trailer
Heavier
Trailer
Blue
LED
Colour
Rotate knob to adjust brake level
2
0
4
6
8
10
3
‘Light’ Application
of Trailer Brakes only.
2
Red
LED
Colour
Brake
Applied

6
4 WIRING GAUGE GUIDE
Whilst Tow-Pro wiring harnesses are available for most vehicles on the market, some
older vehicles will require manual wiring. For this purpose REDARC offers the TPH-025
Universal Wiring harness for custom installation.
Below is a diagram outlining the required wire cross sectional areas for the Tow-Pro
®
Liberty custom installations detailed in Section 2.2.
All wire ratings refer to the minimum required cross sectional area of copper only
(not including insulation). Always use a wire gauge equal to or greater (in cross
sectional area) than what is specified in this guide.
5 PERIODIC MAINTENANCE/CHECKS
Ensure that your trailer brakes are installed and are operating correctly:
Improperly installed and/or faulty trailer brakes can cause erratic vehicle or trailer
behaviour with the potential to cause a road accident. For this reason, it is of utmost
importance that your trailer braking system be installed/maintained by a qualified
installer.
Always check brakes at low speed each time a trailer is attached to your vehicle.
Immediately After Installation (To be done by a qualified Auto-Electrician)
Test the installation/vehicle wiring. Testing your vehicle wiring is best done by connecting
a test light (Max 21W filament globe) to the brake output (BLUE Wire) at the trailer plug,
pushing the manual override and having someone check that the test lamp lights up.
Before each trip
It is important to ensure that your system is operating correctly before you set out. The
following should be checked, along with standard mechanical maintenance, each time
you attach your trailer:
• Correct brake light operation on both your vehicle and trailer
• Correct operation and setting of the electric brake controller
• Correct operation of your trailer brakes
• Check that your breakaway system is operating correctly and that the breaka-
way battery is healthy (if applicable)
• Ensure that the tow hitch, and safety chains and weight distribution systems
are setup correctly
Periodically
It is important to have a qualified technician check the function of your trailer
system on a periodic basis to ensure that everything is operating correctly. REDARC
recommend that you visit a qualified technician before the beginning of each holiday
season to ensure that any towing aids or systems are working correctly.
Other considerations
Please consider the below items whilst towing a trailer:
• Ensure that your vehicle is capable of towing the trailer
• Ensure that you adjust your driving style to allow more time to change lanes
and brake
• Always remember that your electric brake controller is designed to supple-
ment your vehicle brakes; do NOT use the Tow-Pro®Liberty manual override
in place of your vehicle foot brake
6 FREQUENTLY ASKED QUESTIONS
The LED is flashing Blue/Green, what does this mean?
A Blue/Green flash sequence indicates that the unit is in the process of calibration, as
the unit becomes more confident in it’s calibration the Blue will appear for longer. Keep
driving normally and eventually this will turn to a solid Blue.
Is the Tow-Pro®Liberty approved to use with the my Electronic Trailer Stability
Control system?
The Tow-Pro
®
Liberty is approved for use with the AL-KO ESC and the Dexter Sway
Control systems. Please visit the manufacturer’s website for more information.
Will it work with electric over hydraulic trailer brakes?
Yes, please see Section 2.2.3 of this manual.
Can it be mounted in any orientation? How do I set the levelling of the main unit?
Yes, the unit can be installed inside the vehicle at any angle, provided it is firmly
secured and in a location which allows access to the intended remote head location.
Please see Sections 2.1, 2.3 and 2.4 of this manual for more information.
My vehicle has shared tail/brake lights, will the Tow-Pro®Liberty work OK?
Yes, the Tow-Pro
®
Liberty is designed to operate correctly from both standard and shared
tail/brake lights.
My trailer is 3.5 tons fully loaded; Is the Tow-Pro®Liberty strong enough to stop
that much weight safely?
The controller is capable of supplying 2-axle setups at 12V input up to the maximum
rated braking ability of the brakes. You must also ensure that your trailer brakes are
adequate for the trailer load.
Can the remote head cable be extended?
Yes, the remote head cable is a standard RJ45 network cable and can be replaced by
an off the shelf cable up to 5m in length. If the cable used is longer than 1m however
we recommend using a ferrite bead clipped onto the cable as close as possible to
the main unit.
Can the braking level of the manual over-ride be adjusted?
Yes, the manual override can be adjusted whilst it is being applied by turning the
control knob. For more information on manual override please see Section 3.3 of this
manual.
Will my trailer brakes work while I am reversing?
The Tow-Pro
®
Liberty is designed to apply the trailer brakes whether the vehicle is
travelling forward or in reverse. The effectiveness of the brake application in reverse
will depend on the mechanical design of your particular electric brake system.
I have a 2 axle trailer, is the Tow-Pro®Liberty suitable for my trailer?
Yes, the Tow-Pro
®
Liberty is designed to operate up to and including 2-axle trailers.
Can I connect the Tow-Pro through my cigarette lighter socket?
No, as most ‘power sockets’ are rated around 10A which is insufficient to power
trailer brakes and stop lamps circuits. In addition, these outlets may not be powered
continuously and do not make a reliable contact.
7 CHECKING THE PRODUCT SERIAL NUMBER
The image below indicates where the Product Serial Number on the Main Unit and on
the Product Packaging.
The Serial Number Label contains the Part Number (circled in BLUE below) and the
Serial Number (circled in RED below).
The first 4 digits of the serial number indicate the YEAR and MONTH of manufacture,
in the form YYMM.
Red
1.6mm²
14AWG
White
1.6mm²
14AWG
3mm²
Blue
12AWG
3mm²
Black (12V)
12AWG
in
mm
Diagram
Scale
MADE IN AUSTRALIA BY
REDARC ELECTRONICS
PH [phone]
EBRH-ACCNA 2005003460069

7
TWO YEAR PRODUCT WARRANTY – NORTH AMERICA
Over the last four decades our company has established a reputation as the power conversion specialist.
A 100% Australian-owned company, we have met the needs of customers in transport and other industries through exciting, innovative thinking. We believe in total customer
satisfaction and practice this by offering our customers:
• Technical advice free of jargon and free of charge
• Prompt turnaround of orders
• Friendly, personalized, professional service and product support
In the unlikely event that a technical issue arises with a REDARC product, customers are encouraged to initially contact the REDARC Technical Support Team at the phone
number and e-mail listed in clause 26 for prompt and efficient diagnosis and product support.
REDARC Electronics Pty Ltd atf the REDARC Trust trading as REDARC Electronics (“REDARC”) offers a warranty in respect of its Products purchased from an authorized distributor or
reseller of REDARC by a person who is the original retail purchaser (“Purchaser”), on the terms and conditions, and for the duration, outlined below in this document (“Warranty”).
1. In this Warranty, the term “Products” means:
1.1 all new products manufactured or supplied by REDARC (excluding its solar products which
are covered by REDARC’s Solar Product Warranty); and
1.2 any component of or accessory for any product in clause 1.1 manufactured or supplied by
REDARC.
Offer and duration of product warranties
2. REDARC warrants that its Products will be free, under normal application, Installation, use and
service conditions, from defects in materials and workmanship affecting normal use, for
2 years from the date of purchase (“Warranty Period”).
3. The replacement of any component or part of your unit under warranty will not extend the
period of warranty.
4. Where a Product malfunctions or becomes inoperative during the Warranty Period, due to a
defect in materials or workmanship, as determined by REDARC, REDARC will, in exercise of
its sole discretion, either repair or replace the defective Product.
If REDARC determines that the defective Product cannot be repaired or replaced, then REDARC
will provide a refund to the Purchaser for the purchase price paid for the defective Product.
REDARC will cover any shipping cost for replacement.
5. For purposes of clarity, “repair or replace the defective Product” does not include any removal
or reinstallation costs or expenses, including, without limitation, any labor costs or expenses,
shipping costs to return non-conforming Products or any damages that may occur during
the return of Product to REDARC.
6. The remedies set forth herein constitute the exclusive and maximum liability of REDARC, to
the extent permitted by applicable law, with respect to the manufacture, sale, delivery,
installation, operation or use of the Products, whether arising out of contract, negligence,
tort or under any warranty or other legal theory.
7. The replacement of any component or part of your unit under warranty will not extend the
period of warranty.
Exclusions and limitations
8. This Warranty will not apply to, or include any defect, damage, fault, failure or malfunction of a
Product, which REDARC determines, in exercise of its sole discretion, to be due to:
8.1 normal wear and tear or exposure to weather conditions over time;
8.2 accident, misuse, abuse, negligence, vandalism, alteration or modification;
8.3 used or second-hand products;
8.4 non-observance of any of the instructions supplied by REDARC, including instructions
concerning installation, configuring, connecting, commissioning, use or application of the
Product, including without limitation choice of location;
8.5 failure to ensure proper maintenance of the Product strictly in accordance with REDARC’s
instructions or failure to ensure proper maintenance of any associated equipment or
machinery;
8.6 repairs to the Product that are not strictly in accordance with REDARC’s instructions;
8.7 installation, repairs or maintenance of the Product by, or under the supervision of, a person
who is not a qualified auto electrician or technician, or if non- genuine or non-approved
parts have been fitted;
8.8 faulty power supply, power failure, electrical spikes or surges, lightning, flood, storm, hail,
extreme heat, fire or other occurrence outside the control of REDARC;
or
8.9 use other than for any reasonable purpose for which the Product was manufactured.
8.10 use or installation in violation of the instructions or restrictions prescribed by any applicable
standard or code, including those contained in the latest National Electrical Code, Standards
for Safety of Underwriters Laboratory, Inc. (UL) the American National Standards Institute
(ANSI), or the Canada Standards Association (CSA).
9. REDARC shall not be liable for:
9.1 any loss of profit, direct, indirect, special, penalty, incidental, secondary, contingent
or consequential damages or expenses of any kind resulting from a breach of this
warranty; including without limitation damages resulting from loss of use, profits,
business or goodwill, even if REDARC was advised of or was otherwise aware of the
possibility of such damages.
9.2 service, labor, installation or delivery charges incurred in removing or replacing a
Product.
10. Warranty claims in respect of a Product must be made in writing to REDARC and received at
the postal address or email address specified in clause 26 within the Warranty Period.
Such claims must include the following:
10.1 details of the alleged defect or fault and the circumstances surrounding the defect or fault;
10.2 evidence of the claim, including photographs of the Product (where the subject of the claim
is capable of being photographed);
10.3 the serial number of the Product, specified on the label affixed to the Product; and
10.4 proof of purchase documentation for the Product from an authorized distributor.
11. The return of any Products without the prior written instructions of REDARC will not be
accepted by REDARC.
12. Without limiting any other clause in this Warranty, REDARC has the right to reject any
Warranty claim made by a Purchaser pursuant to this Warranty where:
12.1 the Purchaser does not notify REDARC in writing of a Warranty claim within the Warranty
Period;
12.2 the Purchaser does not notify REDARC in writing of a Warranty claim within 1 month of
becoming aware of the relevant circumstances giving rise to the claim, so that any further
problems with the Product are minimized;
12.3 the serial number of the Product has been altered, removed or made illegible without the
written authority of REDARC;
12.4 the Purchaser is unable to provide proof of purchase documentation in accordance with
clause 8.4 or evidence that the Product was properly installed and removed (if relevant), and
that proper maintenance has been performed on the Product, by, or under the supervision
of, a qualified auto electrician or technician, in accordance with the instructions of REDARC.
13. If the Product is found to be working satisfactorily on return to REDARC or upon investigation
by REDARC, the Purchaser must pay REDARC’s reasonable costs of testing and investigating
the Product in addition to shipping and transportation charges. Where REDARC is in
possession of the Product, the Product will be returned to the Purchaser on receipt of the
amount charged.
14. Any replaced Products or components of Products shall become the property of
15. REDARC may, in exercise of its sole discretion, deliver another type of Product or component
of a Product (different in size, color, shape, weight, brand and/or other specifications) in
fulfilling its obligations under this Warranty, in the event that REDARC has discontinued
manufacturing or supplying the relevant Product or component, so long as the replacement
Product or component performs at substantially the same level and carries out substantially
the same function as the Product or component being replaced.
Other conditions of Warranty
16. If the Purchaser acquired a Product for the purpose of resupply, then this Warranty shall not
apply to that Product. In particular, the sale of a Product via an online auction, online store
or other internet website by a party that is not an authorized distributor or reseller of the
Product will be deemed to be a resupply and will render this Warranty void.
17. A Purchaser shall only be entitled to the benefit of this Warranty after all amounts owing in
respect of the Product have been paid.
18. To the maximum extent permitted by law, REDARC does not warrant that the operation of the
Products will be uninterrupted or error-free.
19. To the maximum extent permitted by law, REDARC’s determination of the existence of any
defect and the cause of any defect will be conclusive.
20. The agents, officers and employees of any distributor or reseller of the Products and of
REDARC are not authorized to vary or extend the terms of this Warranty.
21. REDARC shall not be responsible or liable to the Customer or any third party in connection
with any non-performance or delay in performance of any terms and conditions of this
Warranty, due to acts of God, war, riots, strikes, warlike conditions, plague or other
epidemic, fire, flood, blizzard, hurricane, changes of public policies, terrorism and other
events which are beyond the control of REDARC. In such circumstances, REDARC may
suspend performance of this Warranty without liability for the period of the delay reasonably
attributable to such causes.
22. Except for the foregoing Warranty, there are no other representations, conditions
or warranties express or implied with respect to the Products, including
representations, conditions or warranties of merchantability, fitness for a particular
purpose or non-infringement which conditions, representations and warranties are
expressly disclaimed, to the extent permitted by applicable law.
23. No agent, distributor or dealer is authorized to change, modify or extend the terms of this
Warranty on behalf of REDARC.
24. REDARC reserves the right to use new, reconditioned, refurbished, repaired or
remanufactured products or parts in the repair or replacement of any Product covered by
this Warranty.
25. If a clause or part of a clause in this Warranty can be read in a way that makes it illegal,
unenforceable or invalid, but can also be read in a way that makes it legal, enforceable and
valid, it must be read in the latter way. If any clause or part of a clause in this Warranty is
illegal, unenforceable or invalid, that clause or part is to be treated as removed from this
Warranty, but the rest of this Warranty is not affected.
REDARC’s contact details
26. REDARC’s contact details for the sending of Warranty claims under this Warranty
are:
REDARC Electronics Pty Ltd
c/o SHALLCO, INC.
308 Component Dr.
Smithfield, NC 27577
Email: [email protected]
Telephone: [phone] if you are calling from the USA
[phone] if you are calling from Mexico
[phone] if you are calling from Canada
(calls are answered between 8am and 5.30pm Australian Central Standard Time (ACST))
27. REDARC reserves the right to modify this Warranty from time to time and any modifications
shall be effective for all orders placed on or after the effective date of such revised warranty.
Some states, provinces or territories do not allow exclusion or limitation of certain types
of damages, or permit limitations on the length of implied warranties, so certain of these
warranty limitations may not apply to the Purchaser. This Warranty gives the Purchaser
specific legal rights. The Purchaser may also have other rights which vary from state to
state, province to province or territory to territory. If any term of this Warranty is held to be
illegal or unenforceable, the legality and enforceability of the remaining terms shall not be
effected or impaired.This Warranty allocates risk of Product failure between the Purchaser
and REDARC, and REDARC’s Product pricing reflects this allocation of risk and the
limitations of liability contained in this Warranty.
UNDER NO CIRCUMSTANCES SHALL REDARC’S AGGREGATE LIABILITY ARISING OUT OF
OR IN CONNECTION WITH A DEFECTIVE PRODUCT, IN CONTRACT, TORT OR OTHERWISE,
EXCEED THE PURCHASE PRICE OF THE PRODUCT TO WHICH SUCH LIABILITY RELATES.

redarcelectronics.com
INST56 - REV1
North America
[email protected]
www.redarcelectronics.com
United States
[phone]
Canada
[phone]
Mexico
[phone]
Free technical assistance!
For product and technical support contact your regional distributor, call our head office between
8:00am to 5:30pm Australian Central Standard Time, Monday to Friday or send an email using the
regional specific details outlined below.
Copyright © 2020 REDARC Electronics Pty Ltd. All rights reserved.
US Patent Number US 9,446,747
US Trademark 5,353,114
Canadian Trademark TMA991,361
US Trademark 88/847477 (pending)
Canadian Trademark 2018955 (pending)
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