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Power Harness
The power harness is designed to allow routing down the left side of the
trailer from the ECU. It can be routed other ways as application dictates,
but the harnesses must exit the ECU to the left. The power harness
has a protective nylon braid gathering all the wires and cabling into a
bundle. The harness has 18" to 30" of uncovered area to allow for end
connections and mounting considerations.
ƒ Select routing path for trailer power harness
ƒ Identify location that the power, brake request, and ground wires
will be mounted
ƒ Identify further routing for the indicator light. The light cable
extends approximately 15' further from the braid for mounting
location of the light.
ƒ Identify an environmentally protected area on trailer to mount
the OBD2 communication connector. Alternately, the connector
can be mounted in the trailer wiring interface box or in its own
enclosure in an accessible location on the trailer provided there
is approximately 4" of clearance in front of the connector for the
OBD2 plug to be inserted. This connector will need to be used to
complete the configuration of the ECU at the end of installation.
Failure to protect OBD2 connector and/or Bluetooth® adapter
from the environment will result in decreased connectivity.
ƒ Mount an appropriate cable clamp with a rubber insert
approximately 6" away from the power harness exit from the
ECU. The clamp must be large enough to accommodate the
power harness and the axle harness. This clamp will rigidly fix
the cable assemblies for vibration resistance.
CAUTION
Improperly mounting the cable clamp will result in vibration and
damage to the product.
TOW ASSIST INSTALLATION MANUAL
ABS & SWAY MITIGATION SYSTEM
ƒ Route the harness as desired avoiding tight bends and
excessively sharp edges locating the power wires, light harness
and OBD2 extension. Route it through the cable clamp at the
ECU. Utilize cable clamp as needed to avoid pinch points and
sagging areas.
ƒ DO NOT apply power to trailer harness at the junction box, tow
vehicle plug or from any power location until all connections are
made.
ƒ Insert the PLUG B connector to the left side PLUG B receptacle
and secure the connector latch. It locks on a feature on the
connector cap. Make sure there is no orange seal sticking out of
connector.
Axle Harness
CAUTION
Proper harness must be used based on number of axles in
installation. Using the incorrect harness may result in malfunction.
The axle harness has lengths of cable bundles with the speed sensor
connector and magnet connector that run to each wheel. The harness
has colored heat shrink applied at the end of the sensor cable that
coincides with a colored cap on the sensor connector mounted to the
brake backing plate to aid in correct harness installation. Yellow for the
left-side brakes and green for the right-side brakes. The harness also
has provisions for lengths of harness that are bundled to run to the
axles from the ECU connection to front or back of the trailer, primarily
from the center of the trailer.
Common Ground Wiring Point
For correct operation of the ECU, the ground connector of axle wiring
harness must be connected to mating plug of the power harness at ECU.
2021.01 | 7
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