iPA NATO MUTT M2000 User manual

Innovative Products of America®Incorporated
888-786-7899 • 234 Tinker Street, Woodstock, NY 12498 • www.ipatools.com
© 2020 Innovative Products of America®Incorporated. All rights reserved. This material may not be reproduced, displayed,
modied or distributed without the express prior written permission of the copyright holder. For permission, contact [email protected].
Battery Not
Included
Test Trailers Using 7 Round Pin and 12 Pin NATO Harnesses
Uses External 12/24 Volt Battery or Power Source
OPERATOR’S MANUAL
#M2000
NATO MUTT®
Mobile Universal Trailer Tester
MAD
E IN
USA

2
(OEM) Original Equipment Manufacturer USA
LETTER FROM THE PRESIDENT OF IPA®
My name is Ian Vinci and I would like to thank you for your interest in our products.
In today’s world, we have all experienced the lack of service and consideration
demonstrated by many companies after you buy their products. They say whatever
they can to make the sale, and then it’s like pulling teeth to get any service response
out of them. I know this myself rsthand and because of this, I want to be sure that
your experience with IPA®meets your expectations and that IPA®never disappoints
you with our service or customer response.
To prove my commitment to you, if for any reason, you are not happy with one of
our products, or more importantly, with the response from our customer service
department, or any member of the IPA®team, I invite you to contact me directly via
my email, [email protected] or call me at 888-786-7899. Your satisfaction is
more important to me than the sale itself. We will not be in business for long if we
don’t make you completely happy with our products and service. I want IPA®to be
different and be known for its quality and service.
With that said, please take a look at our product line. You will see innovative rst time
products that were created to help you do your job faster and better than before.
I would also like to invite you to critique our products. If you can think of a better way
to make them or changes that will make them work better, please contact me directly
and I will be sure to look into it. If you have an innovation and would like some
feedback, give me a call.
From all of us at IPA®, we thank you for taking the time to review our product line and
wish you and your family the very best of everything.
Ian Vinci
President
IPA®
www.ipatools.com
Toll Free: 888-786-7899
Phone: [phone]
Fax: [phone]

3
TABLE OF CONTENTS
PART 1: IMPORTANT SAFETY INSTRUCTIONS 4
PART 2: WHAT’S INCLUDED 7
PART 3: CONTROLS AND PANELS 8
3.1 Left and Right Side Panels 8
3.2 Electrical Control Panel 9
3.3 Air Brake Control Panel 10
PART 4: SET-UP 11
4.1 Choosing a Battery 11
4.2 Axle and Wheel Installation 11
PART 5: PRETESTING CHECKLIST 12
5.1 Cable Testing Procedure 12
PART 6: GENERAL CONTROLS AND OPERATIONS 13
6.1 Initial Startup and Shutdown 13
6.2 Auto Shutdown Feature 13
6.3 Using the 3-Button Remote Control 14
6.4 Using the 12-Button Remote Control 15
PART 7: ELECTRICAL/LIGHTING TESTING 16
7.1 Selecting a Circuit 16
Auto-Cycle Mode 16
7.2 Ground Integrity Test 17
Establishing a Chassis Ground 17
7.3 Fault Indication 18
Open Circuit 18
Crossed Circuits 18
Short/Overloaded Circuit 19
7.4 Activating Hazard Lights 20
7.5 All Circuits On (Override) Mode 21
PART 8: AIR BRAKE TESTING 22
8.1 Testing Set-Up 22
8.2 Setting Desired Working Pressure 23
8.3 Leak Down Testing 24
8.4 Actuating Air Brakes 25
8.5 Emergency Air Exhaust 26
PART 9: ABS BLINK CODE DIAGNOSTICS 27
9.1 Meritor/WABCO Blink Codes 28
9.2 Haldex Blink Codes 29
9.3 Bendix Blink Codes 34
PART 10: TYPICAL TRAILER WIRING 37
PART 11: MAINTENANCE AND STORAGE 38
PART 12: ADDITIONAL TESTING PROCEDURES 38
PART 13: OPTIONAL ACCESSORIES AND RELATED PRODUCTS 39

4
PART 1: IMPORTANT SAFETY INSTRUCTIONS
IT IS IMPORTANT TO READ, UNDERSTAND AND FOLLOW ALL SAFETY
MESSAGES AND INSTRUCTIONS PRINTED IN THIS MANUAL AND ON THE
EQUIPMENT BEFORE OPERATING. IF SAFETY INFORMATION IS NOT HEEDED,
SERIOUS INJURY OR DEATH TO THE OPERATOR OR BYSTANDERS MAY OCCUR.
DANGER
Indicates a hazardous situation, if not avoided, will result in death or serious injury.
The possible hazards are shown in the adjoining symbols or explained in the text.
WARNING
Indicates a hazardous situation, if not avoided, could result in death or serious injury.
The possible hazards are shown in the adjoining symbols or explained in the text.
CAUTION
Indicates a hazardous situation, if not avoided, may result in minor or major injury.
The possible hazards are shown in the adjoining symbols or explained in the text.
THE FOLLOWING SAFETY ALERT SYMBOLS ARE USED IN THIS MANUAL.
SYMBOL 1: Potential burn hazard. Sparks from electrical shorts can ignite
ammable liquids such as fuel or oil. Heat from electrical overloads can cause re
hazards.
SYMBOL 2: Potential electrical hazard. Batteries have enough electrical energy
potential to ignite ammable liquids such as fuel or oil. Wire overloads can cause
electrical failures. Shock hazard exists.
SYMBOL 3: Potential explosive air hazard. Pneumatic pressures used with this
equipment can cause explosive failures on damaged equipment.
SYMBOL 4: Potential eye hazard. Wear OSHA approved safety glasses. Battery
acid and high air pressures create hazardous situations for eyes.
SYMBOL 5: Potential chemical burn hazard. Wear protective gloves. Battery acid
is corrosive and can cause skin damage.
SYMBOL 6: Potential electrical hazard. Electrical energy can cause heat and
burn hazards.
SYMBOL 7: Potential re hazard. Use caution with ammable liquids such as fuel
and oil. Electrical shorts can ignite ammable liquids and wiring.
SYMBOL 8: Important information is stated.

5
BATTERY GASES, TESTER PREPARATION
AND TESTER/CHARGER LOCATION
RISK OF EXPLOSION
• Gases produced by a battery are highly explosive.
• Wear safety goggles and protective clothing, both
users and bystanders.
• Use in an area having at least four air changes per hour.
• Read, understand and follow all instructions for charger, battery, vehicle and any
equipment used near battery and charger.
• Do not smoke, strike a match, place metal tools on battery or cause a spark in
the vicinity of the battery. When removing battery cables, remove the ground
cable rst.
• Clean terminals before charging battery. During cleaning, keep corrosive particles
from eyes, nose and mouth. Use baking soda and water to neutralize acid and
help eliminate airborne corrosion.
• Never allow clamps on charger cables to touch each other.
• Do not expose tester or charger to rain, snow, or wet conditions.
• Do not allow battery gases or acid to contact MUTT®cabinet. Do not place
charger directly above or below battery.
• Fill battery to level specied by battery manufacturer using distilled water.
• Do not remove cell caps while charging per manufacturer’s instructions.
• Make sure tester cable clamps make tight connections.
• Battery explosion can cause injury.

6
GENERAL CHARGER USE
RISK OF ELECTRIC SHOCK AND FIRE
• Before connecting charger to unit, make sure
controls are set to OFF.
• Do not remove or bypass the grounding pin.
• Do not operate charger with damaged cord or plug.
Replace cord or plug immediately if damage occurs.
• Position power cord and charger cables away from the hood, doors and hot or
moving engine parts where they could be damaged.
• Unplug power cord by grasping and pulling on the plug, rather than the cord
when disconnecting charger from outlet.
• Charger power cord uses equipment-grounding conductor and a grounding plug.
Plug only into a 120V AC outlet that is correctly installed and grounded in
accordance with all ordinances and local codes.
• Unplug power cord from outlet before cleaning or maintaining tester and charger.
Turning off controls does not reduce the risk of electric shock.
• Do not operate charger after a sharp impact, drop or any other damage. Do not
disassemble charger.
• Use only recommended attachments.
• Do not charge a frozen battery.
• Do not overcharge a battery.
• Use charger only on lead-acid automotive batteries. Do not use charger for
charging dry cell batteries.
• Electric shock or re can cause injury.
RISK OF ENTANGLEMENT
• Keep yourself, clothing and battery charger leads clear of moving parts such as
fan blades, pulleys, hood and doors.
• Moving parts can cause injury.
RISK OF BURNS
• Batteries can produce short circuit current high enough to weld jewelry such
as rings, bracelets and watches. You must remove them before working near
batteries.
• Short circuits can cause injury.
DO NOT
Plug Directly Into
AC Wall Outlet

7
PART 2: WHAT’S INCLUDEDPART 2: WHAT’S INCLUDED
INCLUDED PARTS AND ACCESSORIES:
CONTROL FOB BATTERY
(12V Alkaline Energizer
AE or A23) #7900K-34B
10 AMP CHARGER
#KCHG-121001
Main Power
Switch
Handle
12 Pin NATO Out to Trailer
Emergency Side Air
Out (Red Hose)
Mute Switch
Electrical Testing
Panel
Trailer Type Switch
Fuse
7 Round Pin Out to
Trailer
Shop Air Inlet
Emergency Side
Air Ball Valve
Emergency Side Gauge
Service Side Brake
Control Switch
20 AMP Power
Input
Hanging Hook for
Face Shield
Foot
Pneumatic
Wheels
Face Shield/
Battery Cover
Slot to Hang Face Shield
Service Side Air
Ball Valve
Chassis Ground Outlet
Strap for Shoulder Screw
Service Side Gauge
Service Side Air
Out (Blue Hose)
12 Pin NATO Output
RAINCOVER
#CVR-0001
Use the Provided Reference Numbers When Ordering Products and Parts Above
Toll Free: 888-786-7899
FACE/BATTERY SHIELD
#9008-4R
3-BUTTON REMOTE
CONTROL FOB (Qty. 2 Included)
#MUT-RM3-9005A/8
12-BUTTON REMOTE
CONTROL FOB (Qty. 1 Included)
#MUT-RM12
NEXTCIRC.
BRAKELIGHT
CLEARANCE
TAILLIGHTS
PREV.CIRC.
LEFTTURN
TAIL/TAG
BO/RUNNING
AIRBRAKES
RIGHTTURN ABS/REVERSE
ALLCIRC.ON HAZARDS
BO/STOP
8 FT. RED GLAD HAND
#7900AP-8RD-AS
5 FT. 7 ROUND
PIN CABLE
#7900K-1
8 FT. BLUE GLAD HAND
#7900AP-8BL-AS

8
PART 3: CONTROLS AND PANELS
An overview of the MUTT®’s controls, inputs, outputs and their functions.
3.1 LEFT AND RIGHT SIDE PANELS
A. 12-PIN NATO CABLE OUT TO TRAILER
For testing the integrity of a NATO pin trailer cable. Can also be used to verify that
the MUTT®is operating correctly.
B. 12V DC BATTERY TRICKLE CHARGE INPUT
For connecting the trickle charger to the MUTT®’s internal battery (battery not included).
C. SHOP AIR INPUT
A bulk head air input with external stone lter that is used to connect an air
compressor to the MUTT®for testing air brakes on a trailer.
D. 20 AMP INDEPENDENT POWER INPUT SOURCE
For connecting external 12V DC 20 amp max. power
supply. (Power supply is an optional accessory, not for
battery charging.)
E. CHASSIS GROUND OUTLET
Insert the supplied ground cable into this socket for trailers using the frame or
body for ground connections instead of the ground pin in the harness.
F. 7 ROUND PIN OUT TO TRAILER
For connecting 7 round pin trailer to the MUTT®to test electrical circuits.
Left Side Right Side
D E F
AB
DC POWER ONLY
Do NOT plug directly
into AC wall outlet
C

9
3.2 ELECTRICAL CONTROL PANEL
A. POWER SOURCE SWITCH
Select between Internal Battery, External Power or Power Off.
Center: OFF (battery charge in this position only)
Up: Installed Battery ON
Down: External Power ON (power supply is an optional accessory)
B. BACKLIT 30 AMP AMMETER
Meter shows current draw of a selected circuit up to 30 amps.
C. TROUBLE WARNING INDICATORS
Flashing red LEDs indicate problems that may exist in a selected circuit. This includes
the Overload Indicator, Open Circuit Indicator, and Reversed (Battery) Polarity Indicator.
D. MUTE SWITCH
ON disables sound. OFF enables sound.
E. AUTO CYCLE INDICATOR
Illuminates when Auto Cycle Mode is engaged.
F. VOLTAGE INDICATOR
Shows supplied battery voltage integrity. Operating voltage range: 12/24 volt DC.
G. GROUND INTEGRITY
A large green LED above the control knob indicates ground status. Ground
integrity is automatically veried when power is turned on.
H. CONTROL KNOB
Knob activates all electrical test modes and circuits to be diagnosed.
I. CIRCUIT INDICATORS
The small green LEDs illuminate or blink in testing phase.
J. TRAILER TYPE SWITCH
Selecting a mode changes wiring conguration: NATO/7 Spade/6/5/4 Pin,
7-Way Round Pin.
K. 30 AMP FUSE SOCKET
Overload protection.
A
B
D
Electrical Control Panel
PROGRAM REMOTE:
Hold down largebutton on remote while
powering up unit. Releaseafter 5 seconds.
AUTO CYCLE:
Press and releasecontrol knob.
ALL CIRCUITS ON:
Press and hold control knob or remote
for 5 seconds.
*
ACCESS ABS BLINK CODES:
Refer to ABS Manufacturer Manual todetermine
mfg. sequence. Select ABS or BRAKE LIGHT. To
flash power between circuits, press and release
control knob.To maintain power between circuits,
hold control knob for3seconds until beep.
M OBILE U NIVERSAL T RAILER T ESTER
PULL KNOBTO ADJUST
MAX.120 PSI
AIR BRAKECONTROLS
WARNING: CHOCK ALL TRAILER WHEELS
BEFORE APPLYING AIR PRESSURE
OPENCLOSED OPENEXHAUST/
REMOTE
CLOSED
ON
OFF
VISIBLE ALERTS
Ground Integrity: During startup, all
circuits blinking indicate poor ground
pin or chassis ground problem.
Individual circuit(s) blinking indicates
bad return ground for that circuit.
(Check cable/pin connection.)
Open Circuit: Blinking circuit with
audible alert indicates disconnected
or open circuit.
Crossed Circuit: Selected circuit is
illuminated and crossed circuit(s)
blinks with audible alert.
INLET AIR PRESSURE IS DISPLAYED ON
EMERGENCY SIDE GAUGE: To set pressure,
connect shop air, push switch to open,
then adjust regulator knob.
LEAK DOWN TEST (Emergency/Service): To charge system
with air, set switch to open and fill to desired pressure.
Close switch to shut off air flow and note any pressure
drop through needle movement.
BRAKE ACTUATION: Open emergency side switch to release
parking brake. Open service side switch to actuate service
brakes. To operate service brakes with remote, set switch
to exhaust/remote and press small button on remote control.
30 30
1515 0
ON
OFF
.
BRAKE
B/O STOP
ELEC. BRAKE
ABS
REVERSE
NATO/7 SPADE/6/5/4 PIN MODE
7-WAY ROUND PIN MODE
BRAKE
LIGHTS
GROUND
INTEGRITY
TAIL/TAG
B/O RUNNING
AUXILIARY
RIGHT TURN
RIGHT TURN
LEFT TURN
LEFT TURN
CLEARANCE
TAIL LIGHTS
* ABS
TRAILER TYPE
OFF ON 7-WAY
ROUND PIN
NATO
7 SPADE
6/5/4 PIN
C
F
E
G
H
I
J
K

10
3.3 AIR BRAKE CONTROL PANEL
A. Air Pressure Gauge - Emergency Side
B. Air Out to Red Hose - Emergency Side
C. Emergency Side Air Ball Valve
D. Air Regulator Knob
E. Air Pressure Gauge - Service Side
F. Service Side Brake Control Switch
G. Air Out to Blue Hose - Service Side
H. Service Side Air Ball Valve
Air Brake Control Panel
B
A
C
F
E
G
H
D

11
PART 4: SET-UP
4.1 CHOOSING A BATTERY
The MUTT®is a 12/24V DC device. Attempting to power
your MUTT®with anything other than a 12 or 24 volt DC
power source will destroy the internal circuitry and void your
warranty.
(Manufacturer’s Suggested Replacement: Group 31. MUTT®will auto detect 12 or 24
volts. If 24 volts is required, two smaller 12 volt batteries can be used, but they must
be wired in series.)
• Battery Voltage: 12/24V DC
• Battery Type: Lead Acid
• Battery Compartment Dimensions:
13.5" L x 11" H x 9.25" D
• Battery Protection: Inline 30 amp Fuse for
Overcharge
• Battery must be clean and leak free.
• Identify battery polarity.
• Attach ring terminal (with red heat-shrink) to
positive (+) side and ring terminal (with black
heat-shrink) to negative (-) side. Also see
warning indicators on page 4. Connections
must only be made to clean terminal rings.
• Any loose or corroded connectors may cause
misdiagnosis or result in erroneous readings.
• Use well-charged battery.
Battery Compartment
DC POWER
Do not plug directly into
AC wall outlet
4.2 AXLE AND WHEEL INSTALLATION
• Insert axle (A) into left and right axle bores (B) at rear underside of the MUTT®.
• Slide one spacer (C) onto each side of the axle (A).
• Install one wheel (D) onto each side of the axle (A) with valve stem facing away
from the MUTT®.
• Insert one E-Clip (E) into the groove (F) in the axle end in front of the wheel to
each side.
• Check tire pressure. It must not exceed 8 psi.
NOTE: Install the Foot at the bottom of the unit with 45° angle side towards the back
of the unit.
F
E
E-Clip Installation
VALVE STEM
GROOVE
TIRE
(PUSH ONTO AXLE)
WHEEL
B A
F
CDE
Axle and Wheel Installation
FRONT
(UNDERSIDE OF MUTT®)

12
PART 5: PRETESTING CHECKLIST
The pretesting checklist should always be completed prior to using the MUTT®
UNIT PLACEMENT
• Place the tester on a at, level surface.
• Chock trailer wheels to avoid rolling before testing brakes.
MAINTAIN CONNECTORS
Dielectric grease should be used on all connections to avoid corrosion. If a bad
connection exists at the terminal junction, you may get an erroneous reading and the
MUTT®will not work properly.
• Make sure you have a solid connection in the socket.
• Be certain the pins in each plug are clean and spread to the proper size.
• Always check the MUTT®connector pins at the side of the MUTT®for proper
expansion. Over time, the pins may bend in slightly resulting in a poor connection
between the connector and the cable ends. A at head screwdriver can be used
to expand the pins until a tight connection is made.

13
PART 6: GENERAL CONTROLS AND OPERATIONS
6.1 INITIAL STARTUP AND SHUTDOWN
All functions of the MUTT®, including air brake controls, require the Power Source
Switch to be in BATTERY or EXTERNAL position.
POWERING UP
1. Push the Power Source Switch to BATTERY or EXTERNAL.
POWERING DOWN
1. Prior to shutting down, exhaust all air from the brake lines and return all air control
switches to the CLOSED position.
2. Push the Power Source Switch to the OFF position.
NOTE: Turning the power off will disengage the service brakes but NOT the
emergency/parking brakes. Exhausting the Emergency Side air will engage the
spring/parking brakes. See pg. 26 for exhausting/dumping air pressure.
6.2 AUTO SHUTDOWN FEATURE
If left inactive for a period of 20 minutes, the MUTT®enters a Sleep Mode and
powers down.
• A sound is emitted every 20 seconds during Sleep Mode.
• Activation of the control knob will cancel Sleep Mode.
0
DC
AMPERES
30
1
0
2
0
Set Power Source to BATTERY or EXTERNAL
0
DC
AMPERES
30
1
0
2
0
Set Power Source to OFF

14
6.3 USING THE 3-BUTTON REMOTE CONTROL
The included remote control(s) is preprogrammed to your MUTT®and should never
lose its programming. In the event that you suspect your remote has lost its program-
ming, contact technical support at 888-786-7899 or email [email protected].
HOW TO PROGRAM THE 3-BUTTON REMOTE
1. Press and hold the On/Off Button while turing on the MUTT®.
2. Continue to hold for two seconds.
3. Your Remote Control is now programmed.
HOW TO USE THE WIRELESS REMOTE
1. UP ARROW
Press and release to select the next circuit
in clockwise rotation. Press and hold for
ve seconds to activate All Circuits On Mode.
2. DOWN ARROW
Press and release to select the next circuit in a
counterclockwise rotation. Press and hold for
ve seconds to turn on hazard lights.
3. ON/OFF
Press and release to engage/disengage
air brakes.
4. REMOTE CONFIRMATION INDICATOR
Press any of the buttons (1, 2, 3) and the blue
light (4) will illuminate to conrm the battery
power of the remote.
NOTE: Inclement weather, nearby power transformers and closely parked trailers
may reduce the remote signal.
The supplied key fob battery for the remote control is 12V, Alkaline Energizer type
A23. A Gold Peak type 23A or Duracell MN21 battery can also be used.
1
4
2
3
3-Button Remote Control

15
6.4 USING THE 12-BUTTON REMOTE CONTROL
The included remote control(s) is preprogrammed to your MUTT®and should never
lose its programming. In the event that you suspect your remote has lost its program-
ming, contact technical support at 888-786-7899 or email [email protected].
HOW TO PROGRAM THE 12-BUTTON REMOTE
1. Press and hold the Brake Light Button while turning on the MUTT®.
2. Continue to hold for two seconds.
3. Your Remote Control is now programmed.
HOW TO USE THE 12-BUTTON REMOTE
1. CIRCUIT SELECTION
Pressing these buttons will select the
corresponding circuit on the MUTT®(Pressing
and holding the ABS/AUX or Brake Light Buttons
will latch both circuits on.)
NEXT CIRC.
BRAKE LIGHT
CLEARANCE
TAIL LIGHTS
PREV. CIRC.
LEFT TURN
TAIL/TAG
BO/RUNNING
AIR BRAKES
RIGHT TURN ABS/REVERSE
ALL CIRC. ON HAZARDS
BO/STOP
12-Button Remote Control

16
PART 7: ELECTRICAL/LIGHTING TESTING
Complete the pretesting checklist prior to all testing procedures.
The MUTT® is microprocessor controlled and features a special diagnostic rmware,
designed to seamlessly integrate with your preferred methods of testing. The MUTT®
will power the selected electrical circuits and instantly alert you to any signs of a faulty
condition. To properly utilize the diagnostic features, a complete scan of the
trailer’s electrical system should be performed at the front of the trailer using the
MUTT®prior to a walk-around inspection. If any wiring faults are present, the MUTT®
will blink or sound, alerting you to the issue. Only a one-time, walk-around/visual
inspection is needed to conrm that each individual light bulb is properly illuminating.
NOTE: Some advanced functions may not be listed on the face panel, so it’s
important to read the manual in its entirety to ensure that you are getting the full use
of this diagnostic system.
7.1 SELECTING A CIRCUIT
Circuits can be selected for testing manually, via remote control or by initiating Auto
Cycle Mode.
OPERATING WITH MANUAL CONTROL
1. Turn the control knob to select a circuit. The control knob
is automatically set to Ground Integrity when power is
turned on.
OPERATING WITH THE REMOTE CONTROL
1. Press and release the UP ARROW to select the next
circuit in clockwise rotation.
2. Press and release the DOWN ARROW to select the next
circuit in a counterclockwise rotation.
AUTO CYCLE MODE
Auto Cycle Mode automatically tests one circuit at a time
in a clockwise rotation.
1. Press and release the control knob. The Auto Cycle
Indicator should illuminate.
2. A 5-second delay commences before power is
automatically applied to the rst circuit.
3. Circuits are automatically tested one at a time in a clockwise rotation, starting from
the Ground Integrity Indicator.
4. To cancel Auto Cycle Mode, momentarily press and release or turn the control knob.
NOTE: Auto Cycle Mode does not work when ABS or Brake Light Circuits are selected.

17
7.2 GROUND INTEGRITY TEST
Each time the MUTT®is powered on, it automatically runs a Ground Integrity Test. A good
ground connection must be established for the MUTT®to operate a trailer’s electrical system.
1. Immediately after power up, the green lights around the control knob will illuminate.
2. A solid/healthy ground connection is indicated by a steadily illuminated Ground
Integrity Indicator.
3. Bad/poor ground or bad cable condition is indicated by all of the LED’s blinking
simultaneously. See ESTABLISHING A CHASSIS GROUND below.
4. When one or more green circuit LEDs blink while the Ground Integrity Indicator
is steadily illuminated, a solid ground has been established, but an open circuit
has been detected. Refer to OPEN CIRCUIT on pg. 18.
CHASSIS AND PIN GROUNDS
A poor ground warning may be an indication that the connected trailer is only wired
for chassis ground. There are two ground types. 1) Pin Ground: The ground wire from
each light assembly is wired through the main harness up into the trailer plug.
2) Chassis Ground: The ground wire from each light assembly is grounded directly to
the trailer chassis. Ground with the truck is established at the king pin.
ESTABLISHING A CHASSIS GROUND
1. To simulate the king pin on a chassis ground
connection and bypass the Ground Integrity Fault,
plug a chassis ground cable into the MUTT®’s
Chassis Ground Outlet.
2. Attach the other end of the chassis ground cable to
the chassis of the trailer.
3. Be sure that you are attaching to a clean, dry metal for an effective ground.
GOOD GROUND BAD/POOR GROUND
DO NOT
Assume that a Bad
Ground Warning is a
Result of a Faulty Trailer.
Check Cable Connection.
PRESSURIZE
Put the Chassis Ground Cable into the Outlet

18
7.3 FAULT INDICATION
OPEN CIRCUIT
The MUTT®senses no load which is often the symptom of a disconnected wire, cut
wire, poor pin connection or bad return ground. The MUTT®can detect open circuits in
two ways.
1. During Ground Integrity Test: An individual circuit will blink and no audible alerts
will be present.
2. During circuit selection: The selected circuit’s LED will blink, while simultaneously the
Open Circuit Indicator will ash. The MUTT®will also provide an audible alert (beep).
Example: The MUTT®detects an open circuit in the Clearance Light Circuit. The
Clearance LED will blink, the Open Circuit Indicator will ash and the MUTT®will beep.
NOTE: Open Circuit Indicator will only illuminate during circuit selection.
CROSSED CIRCUITS
The MUTT®indicates that two or more circuits are back feeding or crossed. This can
be a symptom of two wires in the same harness wearing through their insulated coating
and connecting.
1. When a crossed circuit is identied, the selected circuit LED will illuminate steadily and the
circuit it is crossed with will ash. The MUTT®will also provide an audible alert (beep).
Example: The MUTT®detects that the Clearance and Tail/Tag are crossed while the
Clearance Circuit is selected. The Clearance LED will illuminate, the Tail/Tag LED will
ash and the MUTT®will beep.
Example: Open Circuit in Clearance Light
Example: Crossed Circuits in Clearance and Tail/Tag Lights

19
NOTE: In some cases, a crossed circuit may be a normal function of advanced
diagnostic testing, such as with certain ABS systems.
SHORT/OVERLOADED CIRCUIT
Short circuits or overloads can occur when a positive, hot wire touches ground.
They can also occur due to faulty lights or connectors.
1. If a short or overloaded circuit is suspected, the MUTT®will instantly stop
powering the circuit.
2. The Overload Warning Indicator will then ash, along with the selected circuit’s
LED. The ammeter needle will also max out and return to 0.
3. The MUTT®will now automatically enter Pulsar®mode. During Pulsar®mode, the
MUTT®will attempt to reapply power to the faulty circuit every three seconds for
an indenite period of time. After power is applied, if a short is still present, steps
1-3 will automatically repeat.
Example: The MUTT®detects a short in the Clearance Light Circuit. The Clearance
LED and Overload Warning Indicator will ash and a warning beep will sound. The
MUTT®will now enter Pulsar®mode.
NOTE: Pulsar® mode can be a useful troubleshooting tool for nding dead and
intermittent shorts.
Example: Short Circuit in the Clearance Light

20
7.4 ACTIVATING HAZARD LIGHTS:
The four-way ashers on the vehicle can be activated with the remote control.
3-Button Remote Control
1. To activate, press and hold the DOWN ARROW for ve seconds.
Press and Hold DOWN ARROW to Activate
Press and Hold HAZARDS to Activate
12-Button Remote Control
1. To activate, press and hold Hazards Button.