2009 Hummer H3T Owner's Manual - Page 234

4-52 Driving Your Vehicle Four-Wire Harness Adapter If towing a light-duty trailer with a standard four-way, flat pin connector, an adapter is available from your dealer/retailer. The trailer towing harness contains the following seven trailer circuits: • Yellow: Left Stop/Turn Signal • Dark Green: Right Stop/Turn Signal Brown: Taillamps White: Ground Light Green: Back-up Lamps Red: Battery Feed Dark Blue: Trailer Brake Connect the adapter to the seven-pin universal heavy-duty trailer connector attached to the bracket on the hitch platform. The flip cap on the vehicle's harness locks onto the tab and helps hold the adapter in place. Plug the four-way pin connector onto the adapter. If charging a remote (non-vehicle) battery, turn on the headlamps to boost the vehicle system voltage to properly charge the battery. Hold the adapter with the tab pointing up.