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Light Module Mounting Location
The Tow Assist uses an indicator light module to notify the driver of
system function and potential diagnostic codes. Driver notification is
an essential part of a safety system. The light module does not have
a regulated location. Dexter recommends that it be located in a place
easily visible to the driver through the tow-vehicle mirror(s) while sitting
in the driver's seat. Please see the suggested locations marked in red in
Figure 1 and Figure 2.
Figure 1:
Light Module
Figure 2:
Wiring
The Tow Assist wiring harness manages connection points with
weatherproof connectors and nylon braided shroud to ensure system
function. The wiring diagram and color code chart are meant to provide
a general understanding and unit requirements to perform the harness
installation section.
CAUTION
Only an experienced technician should route and install wiring.
Wire Identification & Correct Connection
Harness is color coded to match the plug on the brake to assist with
right and left identification.
TOW ASSIST INSTALLATION MANUAL
ABS & SWAY MITIGATION SYSTEM
Light Module
CAUTION
Proper harness must be used based on number of axles in
installation. Using the incorrect harness may result in malfunction.
Trailer configuration wiring is dependent on the number of braked axles
on the trailer. Please note that the Tow Assist system requires all axles
to be equipped with Tow Assist brakes and hub-drums. The following
configurations are valid for the Tow Assist system:
ƒ Single Axle Trailer: A single front axle (FL & FR) should be
selected during trailer variant configuration.
ƒ Tandem Axle Trailer (all axles braked): Both braked axles Front
& Rear (FL, FR, RL, RR) are selected and controlled by Tow Assist.
ƒ Triple Axle Trailer (all axles braked): All braked axles Front,
Center & Rear (FL, FR, CL, CR, RL, RR) are selected and
controlled by Tow Assist.
Wheel Speed Sensor Connectors
Wheel Speed Sensors will connect at the brakes to the wiring harness
with a 2-pin Molex® connector. They are covered with a vinyl cap, green
on right side, yellow on the left and are located on the back (in board)
side of the brake.
Brake Magnet Connectors
Brake magnets will connect to the wiring harness with a 2-pin Weather
Pack® connector and are adjacently located to sensor connector.
Wiring Harness
Your Tow Assist system comes with a two-piece wiring harness that
provides cabling to connect to the tow vehicle connections, ECU and
braked wheel ends. It consists of a power/communication harness
consisting of wires for power with integral 30A fuse, ground, brake
request, ground connection, OBD2 communication cable with integral
4A fuse and the indicator light cable. The other half of the harness is
the axle harness that comes in single, tandem and triple configurations.
This harness connects the wheel speed sensors and brake magnets
from each wheel to the ECU. Install the harness only after the ECU and
axles have been securely mounted. Due to the variation of trailer types,
this is meant as an overview, not as step by step instructions.
Tandem Axle Harness and 30' Power Harness Example
Please see Figure 3 in the reference section.
2021.01 | 5
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