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Trailer keeps blowing Truck brake light fuse !!

Discussion in 'Lawn Mowing' started by Turfer, Sep 15, 2000.

  1. Turfer

    Turfer LawnSite Member
    Posts: 99

    I have a fairly new 12' x 6.5' trailer with the normal 4 pin light connection. My Chevy z71 has an RV connection so I use a standard adaptor to get the 4 pin to fit into the RV connection. The problem is, I keep blowing brake light fuses in my truck. It also blew the turn signal fuse. The parking lights seem to work fine. Am I missing something ? I went from a 15 amp to a 20 amp thinking that this would solve the problem but it still blew. I also blew a brake light fuse in my wife's SUV when I hooked the trailer up to it just to pull it out of the garage so this makes me believe it is the trailer. Any help would be apreciated. Thanks.
  2. sunrise

    sunrise Banned
    Posts: 247

    This happened to me also. My problem was that the a wire on the trailer was bare or skined and was moving and touching metal causeing the blow. I put all the wires in a loom and I havent had problems.
  3. cos

    cos LawnSite Addict
    Posts: 1,253

    That's what I was gonna say. A bare wire touching any grounded metal will blow fuses left and right.
  4. Cutter1

    Cutter1 LawnSite Bronze Member
    Posts: 1,251

    I had the same problem, bare wire came out and was touching. Another time I hade it wired wrong and the ground wire was in the wrong one.
  5. Eric ELM

    Eric ELM Husband, Father, Friend, Angel
    Posts: 4,831

    You have 3 wires going back to the lights, one is for the running lights one is for the left turn signal/stop lights and one is for the right turn signal/stop lights. The 4th wire in a plug is the ground. Either the right or left turn signal/stop light wire to the lights has a dead short. It sounds like the insulation coating wore off and is touching the frame. I had one trailer, they run the wires to the back and then put the wood floor on top of the wires, duh, they should have know down the line a guy would have problems.
  6. Turfer

    Turfer LawnSite Member
    Posts: 99

    Thanks guys. I had a bear wire going through a hole leading to the brake light on the trailer. I checked all the holes and most of them were very sharp from being drilled out during the manufacturing process. It's probably wise to go ahead and tape your wires at these holes when you first get your new trailer.
  7. Eric ELM

    Eric ELM Husband, Father, Friend, Angel
    Posts: 4,831

    Good to hear you found the problem. Normally if you blow fuses only when you have the trailer hooked up, it is a dead short somewhere. I think they should run the wires in conduit and when I need to rewire a trailer, I do this to prevent further problems.

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