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  1. #1

    Unhappy Help wiring electric brake controller for trailer

    I have a 2008 Trailblazer LS equipped with a towing package. I purchase an aftermarket controller which has four wires-white (for ground/negative terminal), blue (for electric trailer brakes), black ( for positive terminal from battery) and red ( cold wire for brake lights). My vehicle owners manual indicates wiring for electric brakes is located under the instrument panel. I have located an unused Delphi connector with 9 wires of various colors. What wire colors do I use for this model vehicle that correspond to above colors on the controller?

  2. #2


    my harness was labeled,i just went out to look but couldn't tell which is what seems how they are all wrapped and stuff, try going to the brake controllers website should be able to find out for sure,if i remember right you don't use all of the wires from the gm harness and there should be a green fuse wrapped inside also to plug in the main box under the hood.

    06 Silverado 4x4
    Westin bars
    GM hood guard
    Extang tonneau cover
    Catback exhaust
    3.5in SS tips
    K&N Cold air intake

    05 Colorado Z71

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