1997 Chevrolet Blazer Owner's Manual - Page 216

Trailer Wiring Harness The light duty trailerwiring is a six-wire harness assembly. The optional heavy-duty trailer wiring is an eight-wire harness assembly. The harnesses are stored under the vehicle, along the passenger-side frame crossmember on two-door vehicles or on the driver's side corner framecrossmember on four-door vehicles. The heavy-duty trailer wiring has a 30-amp 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. Dark Blue: Use for electric trailer brakes or auxiliary wiring. 0 0 Light Green: Back-up lamps (eight-wire harness only). Brown: Taillamps and parking lamps. Yellow: Left stoplamp and turn signal. Dark Green: Right stoplamp and turn signal. White (Heavy Gage): Ground wire. White (Light Gage): Auxiliary stoplamp. 0 0 0 0 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. Storethe harness in its original place. Wrap the harness together and tie it neatly so it won't be damaged. Red: Use for battery charging; it connects to the starter solenoid (eight-wire harness only). 4-55