Question about 1996 GMC Sierra

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I am putting in a trailer brake controler. I found the wires to hook the plug to, but where do they come out at the front of the truck? Are they under the dash?

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  • Zaraki Sep 17, 2010

    The brake control unit should have very specific instructions on how to wire in the brake control unit, and except for the main negative and positve feed wires running out to the battery, (and possibly a blue wire running out to the trailer connector for electric trailer brakes) all of the other connections will be made under the dash, usually by tapping the wires from the brake control unit into the vehicles wiring harness, and it is a matter of locating the proper wires, and usually they are only for the brake light switch and an ignition key "On" only source, and a test light should be used to confirm each wire before any connections are made. I would strongly suggest soldering all of the connections and using a red, black, and a blue10 ga. wire for the battery connections and the electric brake wire, and also a 30 amp circuit breaker installed into the main battery positive wire about 1 foot from the battery. Let me know if you require any further assistance.

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Look at the harness on the back side of the fuse box under the hood. Pull the fuse cover and the fuse box housing. You will probably have to remove the fender brace. They usually run the wires to connect to in the harness and bend them back into the wrap. Should be orange and blue. You will have to splice into them under the hood and run wires into the cab along with a GOOD ground and the drake switch and a hot fused wire. Look at the owners manual and see if fuse post 1 and fuse post 2 are connected. If not, one will feed to the brake controller and the other to 12 volt power to the trailer... Blue brake and orange to trailer power.
Also look at http://www.etrailer.com/faq-wiring.aspx. Full of useful info.

Posted on Jan 14, 2011

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