2003 Chevrolet Astro Owner's Manual - Page 216

Trailer Wiring Harness If you have the optional trailering package, your vehicle will have an eight-wire harness, including the center high-mounted stoplamp battery feed wire. The harness is stored on the passenger's side of the vehicle near the rear wheel well. This harness has a 30 amp battery feed wire and no connector, and should be wired by a qualified electrical technician. After choosing an aftermarket trailer mating connector pair, have the technician attach one connector to the eight-wire trailer harness and the otherconnector to the wiring harness on the trailer. Be sure the wiring harness on the trailer is taped or strapped to the trailer's frame rail and leave it loose enough so the wiring doesn't bend or break, but not so loose that it drags on the ground. The eight-wire harness must be routed out of your vehicle between the rear door and the floor, with enough of the harness left on both sides so that the trailer or the body won't pull it. If you do not have the optional trailering package, your vehicle will still have a trailering harness. The harness is located near the passenger's side rear wheel well. It consists of six wires that may be used by after-market trailer hitch installers. The technician can use the following color code chart when connecting the wiring harness to your trailer. e e Brown: Rear lamps. Yellow: Left stoplamp and turn signal. Dark Green: Right stoplamp and turn signal. White (Heavy Gage): Ground. Light Green: Back-up lamps. White (Light Gage): Center High-Mounted Stoplamp. Blue: Auxiliary circuit (eight-wire harness only). Orange: Fused auxiliary (eight-wire harness only). Store the harness in its original place. Wrap the harness together and tie it neatly so it won't be damaged. 4-4 1