Trailer Wiring Harness - Chevrolet 1999 Blazer Owner's Manual

Trailer Wiring Harness

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The light duty trailer wiring is a six
assembly. The optional heavy
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eight wire harness assembly. The harnesses are stored
under the vehicle, along the passenger
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crossmember on two door vehicles or on the driver's
side corner frame rear crossmember on four
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vehicles. The heavy duty trailer wiring has a 30
feed wire with an inline fuse located by the junction
block. See "Fuses and Circuit Breakers" in the Index.
Both harnesses have no connector 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.
D
Dark Blue: Use for electric trailer brakes or
auxiliary wiring.
D
Red: Use for battery charging; it connects to the
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starter solenoid (eight
4-56
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wire harness
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duty trailer wiring is an
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side frame
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door
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amp
wire harness only).
D
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Light Green: Back up lamps
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(eight wire harness only).
D
Brown: Taillamps and parking lamps.
D
Yellow: Left stoplamp and turn signal.
D
Dark Green: Right stoplamp and turn signal.
D
White (Heavy Gauge): Ground wire.
D
White (Light Gauge): Auxiliary stoplamp.
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
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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