Maintenance When Trailer Towing; Trailer Wiring Harness - Chevrolet 2001 Express Van Owner's Manual

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

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The optional heavy duty trailer wiring package is a
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seven wire harness assembly. The four
the harness assembly is stored under the vehicle, along
the driver's side rear corner of the frame rail. The
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three wire portion of the harness assembly is stored in a
frame pocket under the rear of the vehicle, on the
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driver's side. The heavy duty trailer wiring harness has
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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.
4-42
Four
D
D
D
D
Three
D
D
D
Securely attach the harness to the trailer, then tape or
strap it to your vehicle's frame rail. Be sure you leave it
loose enough so the wiring doesn't bend or break, but
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wire portion of
not so loose that it drags on the ground. Store the
harness in its original place. Wrap the harness together
and tie it neatly so it won't be damaged.
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Wire Harness
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Light Green: Back up lamps
Brown: Parking lamps
Yellow: Left stoplamp and turn signal
Dark Green: Right stoplamp and turn signal
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Wire Harness
Dark Blue: Use for electric trailer brakes
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(seven wire harness only)
Orange: Trailer accessory (seven
White (heavy gage): Ground wire
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wire harness only)