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Maintenance When Trailer Towing
Your vehicle will need service more often when
you’re pulling a trailer. See the Maintenance
Schedule for more on this. Things that are
especially important in trailer operation are
automatic transmission fluid (don’t overfill), engine
oil, axle lubricant, belt, cooling system and
brake system. Each of these is covered in this
manual, and the Index will help you find them
quickly. If you’re trailering, it’s a good idea
to review these sections before you start your trip.
Check periodically to see that all hitch nuts and
bolts are tight.
Trailer Wiring Harness
The optional heavy-duty trailer wiring package
includes a seven-wire harness assembly at
the rear of the vehicle and a four-wire harness
assembly under the left hand side of the
instrument panel. The seven-wire harness
assembly is taped together and located in a frame
pocket at the driver side rear left corner of the
frame. The seven-wire harness includes a 30-amp
feed wire.
Both harnesses come without connectors and
should be wired by a qualified electrical technician.
The technician can use the following color code
chart when connecting the wiring harness to
your trailer and trailer brake controller.
Seven-Wire Harness
• Light Green: Back-up lamps
• Brown: Parking lamps
• Yellow: Left stoplamp and turn signal
• Dark Green: Right stoplamp and turn signal
• Dark Blue: Use for electric trailer brakes
• Red/Black Stripe: Trailer accessory
• White (heavy gage): Ground wire
Four-Wire Harness (Trailer Brake Controller)
• Black: Ground
• Red/White Stripe: Fused Battery
• Dark Blue: Trailer Brake Feed
• Light Blue: Fused Stoplamp/CHMSL
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