2009 GMC Savana Van Owner's Manual - Page 242

Trailer Wiring Harness The optional heavy-duty trailer wiring package includes a wiring harness, with a seven-pin connector at the rear of the vehicle and a four-wire harness assembly under the driver side of the instrument panel. The four-wire harness assembly comes without a connector. If the vehicle does not have a trailer hitch, the seven-wire harness assembly with connector is taped together and located in a frame pocket at the driver side rear left corner of the frame. If the vehicle has a trailer hitch, the seven-wire harness assembly with connector is attached to a bracket on the hitch platform. In both cases, the seven-wire harness has a connector and includes a 30-amp feed wire. The seven-wire harness connector contains the following trailer circuits: The four-wire harness (without connector) contains the following circuits: Black: Ground Red/White: Battery Feed Dark Blue: Trailer Brake Signal Light Blue: CHMSL/Stoplamp Supply Voltage * If the vehicle is a cutaway with trailer provisions, a 15 amp fuse will be shared for both left/stop trailer turn and right/stop trailer turn signals. However, the cutaway lighting connector will have a 10 amp fuse for each signal. ** If the vehicle is a cutaway with trailer provisions, a 15 amp fuse will be shared for trailer park lamps and cutaway rear lighting connector park lamps. Also, a 10 amp fuse will be shared for trailer back-up lamps and cutaway rear lighting connector back-up lamps. Light Green: Back-up Lamps (10A fuse)** White: Ground Dark Blue: Trailer Brake Signal Dark Green: Right Rear Stop and Turn Signal* Red/Black Stripe: Battery Feed (30A Fuse) Brown: Trailer Park Lamp Supply Voltage (15A fuse)** • Yellow: Left Rear Stop and Turn Signal * 4-40