GMC 2000 Sierra - Manual (Page 265)

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Camper/Fifth - Wheel Trailer Wiring Package
(If Equipped)
The eight - wire camper harness is located under the front
edge of the pickup box on the driver’s side of the
vehicle, attached to the frame bracket. A connector will
have to be added to the wiring harness which connects
to the camper.
The eight - wire harness contains the following
camper/trailer circuits:
D Yellow: Left Stop/Turn Signal
D Dark Green: Right Stop/Turn Signal
D Brown: Taillamps
D White: Ground
D Light Green: Back
- up Lamps
D Light Blue: Center High - Mounted
Stoplamp (CHMSL)
D Red: Battery Feed
D Dark Blue: Trailer Brake
A jumper harness for an electric trailer brake controller
and a trailer battery feed fuse are included with this
trailering package. (See“Instrument Panel Jumper
Wiring Harness” later in this section.)
If your vehicle is equipped with the “Heavy - Duty
Trailering” option, please refer to “Heavy - Duty Trailer
Wiring Package”, earlier in this section.
When the camper - wiring harness is ordered without the
heavy - duty trailering package, an eight - wire harness
with a seven - pin connector and separate CHMSL
connector are located at the rear of the vehicle and are
tied to the vehicle’s frame.