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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
• Orange: 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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