1998 Chevrolet Express Van Owner's Manual - Page 200

Trailer Wiring Harness The light-duty trailer wiring harness is a six-wire harness assembly. The optional heavy-duty trailer wiring package is an eight-wire harness assembly. The harness is stored under the vehicle, along the driver's side rear corner of the frame rail. The heavy-duty trailer wiring harness has 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. Dark Blue: Use for electric trailer brakes (eight-wire harness only) Orange: Trailer accessory (eight-wire harness only) 0 0 Light Green: Back-up lamps Brown: Parking lamps Yellow: Left stoplamp and turn signal Dark Green: Right stoplamp and turn signal White (heavy gage): Ground wire White (light gage): Center high-mounted stoplamp 0 0 Securely attach the harness to the trailer, then tapeor rail. Be sure you leave it strap it to your vehicle's frame loose enough so the wiring doesn't bendor break, but not so loose that it drags on the ground.Store the harness in its original place. Wrap theharness together so and tie it neatly it won't be damaged.