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  1. #1

    Default Trailer interior lights

    I bought an enclosed car trailer a couple of years ago and the interior lights never worked. The previous owner said they didnít work for him and gave me wiring schematics. I didnít 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 driverís 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 ownerís manual.
    My truck is a 2008 2500 HD w/ the towing package. I hope this helps someone.

  2. #2


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

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

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3

    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Piermont,NY, back in Northern NJ now, But may be in IL soon....


    Sometimes wrapped up in the Glove box too....
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  4. #4


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

  5. #5
    Former Member
    Join Date
    Apr 2012
    Reading, PA


    Quote Originally Posted by SurrealOne View Post
    Usually they have to add a fuse, too...
    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. #6


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

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

    Check out my other mods in My Garage:

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