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Trailer interior lights

Discussion in 'GM Electrical Tech' started by trackbird, Apr 7, 2013.

  1. trackbird

    trackbird New Member

    I bought an enclosed car trailer a couple of years ago and the interior lights never worked. The previous owner said they didn’t work for him and gave me wiring schematics. I didn’t spend alot of time on it but last week I took the trailer for a professional service on axles and brakes; they fixed the problem in about 3 minutes.
    The fellow raised the hood ON MY TRUCK and removed the fusebox cover on the driver’s side. He then reached into the wire loom nearby and pulled out a length of red wire that had a connector on the end. That wire went on the middle post of the fuse box. He put a fuse in the circuit and VOILA... lights in the trailer.
    I somehow overlooked that if it was in the owner’s manual.
    My truck is a 2008 2500 HD w/ the towing package. I hope this helps someone.

  2. RayVoy

    RayVoy Well-Known Member 2 Years 1000 Posts

    Yep, the infamous "what's this red wire for" wire.

    Also used to charge an on-board battery if one is installed.
  3. Enkeiavalanche

    Enkeiavalanche Rockstar 4 Years ROTM Winner 5000 Posts

    Sometimes wrapped up in the Glove box too....
  4. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    Usually they have to add a fuse, too...
  5. steved

    steved Former Member

    Or two...

    On my 2012, there are three of those "red wires" and two fuses required...aftermarket brake controller wiring, trailer 12VDC power wiring, and roof-mounted beacon wiring...and then the fuses to power the two studs these get hooked to.
  6. Conlan Rose

    Conlan Rose Active Member 2 Years 1000 Posts

    The 90's trucks have the fuses preinstalled... back when GM cared.

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