2010 Hummer H3T Owner's Manual - Page 265

Driving and Operating Trailer Brake Control Wiring Harness The trailer brake control wiring harness is located under the instrument panel to the right of the steering column. The wires are taped to the harness that goes to the courtesy light under the instrument panel. The harness has the following wires: ... 9-81 Trailer Recommendations Subtract the hitch loads from the Cargo Weight Rating (CWR). CWR is the maximum weight of the load the vehicle can carry. It does not include the weight of the people inside, but you can figure about 68 kg (150 lbs) for each passenger. The total cargo load must not be more than the vehicles CWR. Weigh the vehicle with the trailer attached, so the GVWR or GAWR are not exceeded. If using a weight-distributing hitch, weigh the vehicle without the spring bars in place. The best performance is obtained by correctly spreading out the weight of the load and choosing the correct hitch and trailer brakes. For more information see Trailer Towing on page 9‑74. Conversions and Add-Ons Add-On Electrical Equipment Notice: Do not add anything electrical to the vehicle unless you check with your dealer first. Some electrical equipment can damage the vehicle and the damage would not be covered by the vehicle's warranty. Some add-on electrical equipment can keep other components from working as they should. Add-on equipment can drain the vehicle battery, even if the vehicle is not operating. The vehicle has an airbag system. Before attempting to add anything electrical to the vehicle, see Servicing the Airbag-Equipped Vehicle on page 3‑40 and Adding Equipment to the Airbag-Equipped Vehicle on page 3‑40. Red Wire: AUX B+ Black Wire: Ground Light Blue Wire: Brake Signal Dark Blue Wire: Trailer Brakes