Redarc Tow-pro ebrh-accna User manual

Tow‑Pro®Liberty

Electric Trailer Brake Controller − 12V

MODEL:

 EBRH‑ACCNA

2

Tow‑Pro®Liberty

Electric Trailer Brake Controller

(EBRH‑ACCNA)

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 Tow‑Pro®Liberty is able to operate electric or

electric over hydraulic trailer brakes from 12 V vehicle

systems without the need for manual selection or

extra components.

Contents | 3

CONTENTS

WARNINGS AND SAFETY INSTRUCTIONS ��4

1 SPECIFICATIONS ��6

1.1 Kit Contents ��6

1.2 Dimensions and Connection ��7

2 INSTALLATION��8

2.1 Mounting the main unit ��8

2.2 Wiring the brake controller��9

2.3 Mounting the Remote Head Control Knob ��12

2.4 Remote Head Mounting Guide ��13

2.5 Installation Accessories ��14

2.6 Active Calibration��14

3 OPERATION �� 15

3.1 Adjusting the Braking Force ��15

3.2 Normal Brake Application ��15

3.3 Manual Override��16

3.4 Led Indication��16

3.5 Park Brake Feature ��17

3.6 Troubleshooting ��17

4 WIRING GAUGE GUIDE �� 20

5 PERIODIC MAINTENANCE AND CHECKS�� 21

6 FREQUENTLY ASKED QUESTIONS �� 22

7 WARRANTY�� 26

4 | Warnings and Safety Instructions

WARNINGS AND SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS — This manual contains important safety instructions for the

Tow‑Pro®Liberty Electric 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.

WARNING

• 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.

CAUTION

1. 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.

2. 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 and humidity.

Exposure to these conditions may cause damage to the unit’s circuitry and may cause erratic trailer

braking.

3. A Fuse or Circuit Breaker of appropriate rating must be installed to protect the vehicle system. Please

refer to the wiring instructions starting on page 10 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 or change modes.

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. 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 trailers with electric brakes up to two axles. Note that Federal and

State laws apply to trailer weights and brake controller requirements. Please consult your local authority to

ensure you comply with the legal requirements.

7. Do not drive with the Tow‑Pro®Liberty while a fault code is active. Fault codes of the Tow‑Pro®Liberty

may indicate conditions that make it unsafe or illegal to drive, including unreliable trailer brakes or failure of

brake lights.

Warnings and Safety Instructions | 5

8. During the calibration step of the Tow‑Pro®Liberty, braking of the trailer may be inconsistent. REDARC

recommends calibrating the Tow‑Pro®Liberty without a trailer attached. A normal drive of a few miles

will do for this purpose. If calibrating with a trailer attached, then the recommended dial setting for the

Tow‑Pro®Liberty is 4 or less.

NOTICE

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. Bad grounding of the unit will result in poor or

no operation.

2. The Tow‑Pro®Liberty does not act as a trailer lights voltage converter. If the trailer brake lights operate

on a different voltage, damage to the vehicle; trailer and/or Tow‑Pro®Liberty and associated wiring may

result. This may also result in reduced (or total loss of) trailer braking.

3. When installing the Tow‑Pro®Liberty Remote Control to a thin panel, washers are recommended to

reinforce the structure of the panel.

4. 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.

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.

5. 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.

6. The State of California regulations require that the manual override function illuminates the trailer brake

lights. Once the Tow‑Pro®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.

SAFETY MESSAGE CONVENTIONS

Safety messages in this manual include a signal word to indicate the level of the hazard as follows:

WARNING Indicates a potentially hazardous situation which, if not avoided, could

result in death or serious injury to the operator or to bystanders.

Carefully read the message and follow instructions precisely.

CAUTION Indicates a potentially hazardous situation which, if not avoided, may

result in moderate or minor injury to the operator or to bystanders.

Read the message and follow instructions precisely.

NOTICE Indicates a situation that may cause equipment damage.

6 | Speciﬁcations

1 SPECIFICATIONS

Part Number EBRH‑ACCNA

Operating Voltage 9 V to 16 V

Nominal Input System Voltage 12+ V

Brake Input Signal Voltage OFF: 0 V

ON: +12 V nominal

Brake Coil Voltage 12 V

Max. Trailer Axles 2 Axles

Nominal Current Draw 12 A

Max. Rated Current 18 A

Standby Current < 5 mA

Operating Temp −4°F to 140°F (–20°C to +60°C)

Weight 7.05oz (200 g)

Warranty 2 years

1.1 Kit Contents

2

16

4

3

5

Reference Description

1Remote Head Assembly

2Main Unit

3Remote Head Knob

4Remote Head Nut

5Remote Head Bezel

6Remote Head Cable 3'3" (1 m)

Speciﬁcations | 7

1.2 Dimensions and Connection

0.9"

(23.7 mm)

0.7"

(19.0 mm) (Recommended)

1.7"

(43.5 mm)

1.8"

(46.5 mm)

0.4" (10 mm) 0.4" (10.0 mm)

Brake

Lights

(RED)

Input

Power

(BLACK)

Ground/

Earth

(WHITE)

Brake

Output

(BLUE)

Remote Head

Connection

0.45" (11.5 mm)

0.8"

(20.0 mm)

0.8"

(20.0 mm)

1.2"

(30 mm)

3.3" (84.5 mm)

2.6" (67 mm)

2.9" (74 mm)

3.9" (100 mm)

4.1" (104 mm)

1.1"

(28.8 mm)

8 | Installation

2 INSTALLATION

2.1 Mounting the main unit

The Tow‑Pro®Liberty should be mounted inside the vehicle cabin using either 5⁄32" (M4) diameter

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.

CAUTION

• 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 and humidity. Exposure to these conditions may cause damage to the unit’s

circuitry and may cause erratic trailer braking.

Any Secure Orientation OK

Do Not Mount to Cables/Wiring

Looms (Must be mounted to a

rigid or solid object or surface)

Installation | 9

2.2 Wiring the brake controller

The Tow‑Pro®Liberty is sold without a wiring harness.

REDARC manufacturers 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.

CAUTION

• A Fuse or Circuit Breaker of appropriate rating must be installed to protect the vehicle

system. Please refer to the wiring instructions starting on page 10 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 speciﬁc. This

connection point must:

• Provide a voltage of the same voltage level as the Start Battery* 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.

*Start Battery voltage output means directly from the Start Battery and within 0.4 V of Supply (Black wire) voltage.

10 | Installation

2.2.2 WIRING — ELECTRIC BRAKES

The Tow‑Pro®Liberty is designed to operate electric brakes in 12 V electrical systems only. For wire

selection refer to the wiring gauge guide "Wiring Gauge Guide" on page 20.

NOTICE

The Input Power (Black) wire must be connected directly to the positive terminal of the start

battery via a Fuse (30 A) or Circuit Breaker (30 A) and not through an Ignition source.

Figure 2.2.2.1: Typical Setup

To 12V Vehicle

Brake Light trigger

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 (1.6mm)

12AWG (3.0mm)

2 AWG (3.0mm)

14AWG

(1.6mm)

Ground

For red wire connection, see Section2.2.1, "Red Wire (Vehicle Brake light) Connection" (page9).

Installation | 11

2.2.3 WIRING — ELECTRIC/HYDRAULIC BRAKES

NOTICE

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 12 V power feed for the hydraulic pump. For example:

Figure 2.2.3.1: Electric / Hydraulic Trailer Brake Systems

Electric / Hydraulic

System

Power Supply for

Electric/Hydraulic System

Output Wire (Blue)

Tow-Pro

Brake

Signal

12V Start

Battery

For wire selection refer to the wiring gauge guide in Section4, "Wiring Gauge Guide" (page20).

2.2.4 WIRING — 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.

Figure 2.2.4.1: Vehicles with a Can Bus System

Red

White

To 12V Brake

Light Trigger

To 12V Electric

Trailer Brakes

Blue

30A Circuit Breaker

(CBK30-EB)

To Vehicle

Start Battery

Black

Dash mount

controls for

Tow-Pro

To Chassis

Ground Bolt

12 | Installation

2.2.5 BRAKE SIGNAL SOURCE — BRAKE PEDAL SWITCH

Sourcing the brake signal at the brake pedal may 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.

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.

Figure 2.3.5.1: Suitable Remote Head Mounting Locations

NOTICE

Do NOT install the Remote Head in any location that may inﬂuence the activation of

vehicle air‑bags.

Installation | 13

2.4 Remote Head Mounting Guide

Test the push‑button after installation. If the LED does not illuminate when you push the button,

REDARC recommend installing the remote head without the Bezel.

Ø1/8"

(Ø3.5mm)

Ø3/8"

(Ø10.0mm)

0.3" (7.5mm)

0.08 - 0.12"

(2.0 - 3.0mm)

drill pilot

hole rst

or use a

spade bit

1Drill mounting holes. 2Place bezel (optional) to cleaned surface.

0.6 lbf-ft

(0.8Nm)

3Insert Remote Head shaft through the

hole and fasten with nut. 4Turn shaft fully anti‑clockwise.

Level marker

5Apply knob with ‘0’ aligned to level

marker on the bezel. 6Test installed remote head for

correct function.

CAUTION

Ensure the remote head push‑button activates correctly when installed into panels 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.

14 | Installation

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.

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.

During Calibration Once Calibrated

Time

NOTE: If there is no trailer is connected, Active Calibration will occur as normal, however the LED

will not alternate Blue/Green. The LED will already be Blue when the trailer is connected. Whether

a trailer is connected or not, drive normally and Active Calibration will ensure the Tow‑Pro®Liberty

learns the correct direction of travel.

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.

Operation | 15

3 OPERATION

3.1 Adjusting the Braking Force

Lighter

Trailer

Heavier

Trailer

Blue LED

Colour

Rotate knob to adjust brake level

2

0

4

6

8

10

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 gain control knob to a higher number (clockwise)

to increase the trailer braking force.

The braking level will be indicated by the LED changing 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.

3.2 Normal Brake Application

Once calibrated, the Tow‑Pro®Liberty operates the trailer

brakes Proportional to the vehicle braking level.

Proportional 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.

Red

LED

Colour

Brake

Applied

16 | Operation

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.

3.4 Led Indication

The Tow‑Pro®Liberty will indicate Operation and Fault Conditions 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

Time

Sleep Mode*1Blue breathing once with button push*2

Trailer Connected Solid blue

Time

Braking Blue to Red*3

Fault Code (trailer braking

performance potentially

compromised)

Flashing in any sequence (other than Blue/Green) please

refer to troubleshooting on page 17 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.

Operation | 17

3.5 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.

Refer to Section3.6.1, "Fault Codes – Flash Patterns" below for the list of ﬂash patterns. It shows

the cause and recommended course of action for each of the conditions which may be detected.

NOTICE

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.

18 | Operation

3.6.1 FAULT CODES – FLASH PATTERNS

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 OR the trailer is not

plugged in

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 or

within brake hubs

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 YELLOW

for 1 second followed

by OFF for 1 second,

repeatedly

Overload on trailer brake (BLUE)

circuit or extreme cold trailer

brakes

Check trailer has a Maximum

of 2 axles (4 brakes), wait for

brakes to warmup

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 0V when

vehicle brake is not applied

The LED is ﬂashing RED

The unit has detected an

internal fault of your Al‑Ko iQ7

hydraulic/pneumatic system

Check for faults according to

the manual for the Al‑Ko iQ7

actuator

There is a voltage drop between

the trailer ground and the

vehicle ground

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 and 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

Operation | 19

LED Sequence Symptom/Description Possible Cause Suggested Action

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 0 V

when the brakes are off and

12 V with the brakes applied

1 Second

Flashing green any time

with knob fully CW The unit is not yet calibrated Keep driving normally and the

unit will calibrate

1 Second

The LED is ﬂashing BLUE The Remote Head cable may

be damaged

Replace the cable between the

Remote Head and the Main Unit

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

1 Second

The LED is ﬂashing BLUE The RED wire is (constantly) at

a low voltage

Check the voltage at the

RED wire and reassess the

connection point if necessary

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

Check the trailer wiring as the

unit is not recognising that a

trailer is connected

Time

The LED is not working

at all

There is a bad connection

between the Main Unit and

Remote Head

Check that the RemoteHead

cable is correctly plugged

in to both the Main Unit and

RemoteHead

Time

The LED is not working

at all

The light tube may have been

lost or misplaced during

installation

Find and ﬁt the light tube or

contact supplier for a new light

tube

20 | Wiring Gauge Guide

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, "Wiring the brake controller".

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.

Required Wire Cross Sectional Areas for Tow‑Pro®Liberty custom installations

Red

1.6mm

14AWG

White

1.6mm

14AWG

3mm

Blue

12AWG

3mm

Black (12V)

12AWG

Diagram

Scale

mm

in

Redarc Tow-Pro EBRH-ACCNA User manual

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