2005 Duramax Trailer Brake Wiring Harness Diagram. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! There are several standards for trailer wires, and if you search, you'll find a different Trailer Wiring Diagram for each.
This diagram shows the colors of a basic trailer wiring setup as well as what each wire is supposed to be connected to. If you have a trailer wiring harness it probably has a short in it and is back feeding the circuit when the brakes are applied remove and replace the trailer You should see either a brake controller box under the dashboard, or a wiring harness under or through the back bumper for hooking power from. I took it apart but it did not look like the wire could be re-connected.
This page has wire diagrams for many electric options including wires for trailer lights, brakes, alt power and connectors.
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I just installed the brake control in the cab following the factory diagram -- all worked OK. if anyone needs wiring diagrams pm me i have access to almost anything. thx. This brake controller wiring diagram shows which wire goes where. I had one that explained all the ECM pins, voltages The owner of this GM Duramax was headed to Montana on vacation with his family and camper trailer in tow.