2012 GMC Sierra Trailer Wiring | etrailer 2012 GMC Sierra Trailer Wiring. Select Vehicle Style: RV-style connector in your truck bed to simplify hookup of your 5th-wheel or gooseneck trailer. Harness plugs into existing wiring and retains use of factory 7-pole at the bumper. 90-Degree-angled connector fits into tight spaces. 2012 GMC Sierra Trailer Hitch. 2012 GMC Sierra Brake 2012 GMC Sierra Hitch Wiring - CARiD wwwd››Trailer Hitches›Hitch Wiring›GMC›SierraGMC Sierra 2012, Towing Wiring Harness by Westin®. Location: G. Electric System Type: 2-Wire System. This superior product is perfect to make your trailer towing experience safe and convenient.
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