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Keep blowing brake light fuse

Discussion in 'Trucks and Trailers' started by Edgewater, Aug 23, 2005.

  1. Edgewater

    Edgewater LawnSite Senior Member
    Posts: 457

    I have an 88 F-250 that keeps blowing the brake light fuse. It pulls a 16 foot trailer with electric breaks. If I replace the fuse, it will not burn right away, it will last most of a day. Can't seem to find the cause.

    Anybody have any suggestions?
  2. Jamesgateslandscaping

    Jamesgateslandscaping LawnSite Senior Member
    Posts: 421

    The lighting system on the trailer is being grounded to the frame, which is causing the blow, happened to mine last week. Check it with a meter and there should be a resistence because of the lights, if there isnt any there is def. a ground fault.
  3. Edgewater

    Edgewater LawnSite Senior Member
    Posts: 457

    Thanks for the help, I have two PJ trailers, one with brakes and one w/o.

    I have checked several times and they seem ok tonight. I am begining to think that they may only cause problems when it's raining. It's definately the trailer though because it does it on two different trucks
  4. PLM-1

    PLM-1 LawnSite Bronze Member
    Posts: 1,640

    Mine used to only blow when it rained. It was the brake controller fuse though. I ended up just putting a breaker in it.

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