Two trailer harnesses are available: the heavy-duty trailer
towing (UY7) harness and the camper (UY1) harness.
Pickup Trailer Harness Routing
Suburban/Utility Trailer Harness Routing
The option UY7 trailer harness is for heavy-duty towing applications.
A 30-amp fused battery feed wire and auxiliary circuit routes from the
cowl-mounted junction block, along the body side rail, to the rear bumper
crossmember. The harness for the brake/parking lamps is spliced from the rear
lamp harness. The harness is at the rear bumper crossmember. A plastic strap
binds the harness. Tape wrapped around the harness prevents short circuits.
The 8 wires have the following functions:
| • | Orange -- The 30-amp fused battery feed |
| • | Blue -- An auxiliary circuit for electric trailer brakes |
| • | Brown -- The taillamps and the license lamps |
| • | Light green -- The backup lamps |
| • | Dark green -- The right turn signal and the stoplamp |
| • | Yellow -- The left turn signal and the stoplamp |
| • | White (heavy gage) -- Ground |
| • | White (light gage) -- The center high-mounted stop lamp |
The UY7 option does not include a connector at the end of the harness.
A qualified technician must wire the connector following production.
- Attach the trailer harness wiring to the trailer
- Strap the harness wiring to the vehicle in a manner that allows
slack in order to prevent the following conditions:
| • | The harness drags on the ground. |
- Secure with tape or straps the trailer portion of the harness
to the trailer tongue in order to prevent the harness from dragging on the
ground.
- Secure the harness when the harness is not in use.
| 4.1. | Wrap the harness together. |
| 4.2. | Bind the harness with a tie strap in order to avoid damage. |
| 4.3. | Store the harness behind the rear bumper on the fuel tank. |
| 4.4. | Strap the harness with a band or a tie strap. |
The second wiring harness option is the UY1 camper wiring harness. The
UY1 harness is under the vehicle. The harness is inside the frame rail. The
harness is even with the front of the pickup box on the driver's side.
The UY1 harness is for the brake/parking lamps. The harness has an auxiliary
power feed.
The wires have the following functions:
| • | Dark blue -- A 30-amp fused auxiliary power circuit. The
other end of the wire is taped to the wiring near the junction block on the
cowl. |
| • | Dark green -- The right turn signal and the stoplamp |
| • | Light green -- The backup lamps |
| • | Yellow -- The left turn signal and the stoplamp |
- Route the trailer harness wiring between the frame and the bumper,
or the camper and the body, in such a manner that slack remains in the harness
in order to prevent the following conditings:
| • | The harness drags on the ground. |
- Tape or strap the trailer portion of the harness (if used) to
the vehicle in order to prevent the harness from dragging.
- Secure the harness when the wiring is not in use.
| 3.1. | Wrap the harness together. |
| 3.2. | Bind the harness with a tie strap in order to prevent damage. |
