Truck side trailer wiring problem

Discussion in 'Towing & Trailer Tech' started by Mtrotter, Mar 3, 2012.

  1. Mtrotter

    Mtrotter New Member

    Hello all, I have a 2004 GMC Sierra 1500 Z71 crew cab.

    My truck is used mainly for towing my trailer and not driven much otherwise and my 10 month old Lab puppy chewed the harness a bit for the 7pin trailer wiring plug on my truck.

    I re-connected all the wires by matching the colored wires to one another but have one blue wire left over with no match for it. There was two blue wires, do a couple of them get combined up? The only think on my trailer that isnt working is the electric brakes.

    Anyone have a photo of theirs or a diagram? thanks, Im hoping to use my trailer tomorrow.

    Morgan Trotter
  2. KidHauler

    KidHauler Epic Member 5+ Years 500 Posts

    Try this link:

    The heavy gauge blue wire is for the trailer brake. The blue is paired with an orange that runs along the frame rail to the under-hood fuse block.

    Good luck,

    I'm going to try this, too... [MENTION=33937]Mtrotter[/MENTION]
    technology, huh?
    Last edited: Mar 3, 2012

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