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Plow light fuse keeps popping

Discussion in 'Truck & Equipment Repair' started by redtred, Jan 9, 2010.

  1. redtred

    redtred Junior Member
    from Maine
    Messages: 6

    Some background first. My truck is an 08 2500 silverado with the duramax. I installed the plow harness myself. The isolation module (3 port) and other wiring on the truck was new a year ago. The plow is a 8ft Fisher mm2 that is about 5 years old. Everything has worked perfectly until the headlight fuse on the plow harness started blowing. It is the 10amp fuse that comes out of port #1 and also has the fuse for the fishstick control in it( two 10 amp fuses under the same cover). If I replace the fuse it will switch back to plow lights for about 15 minuets then blow again. When the fuse goes it switches back to the truck headlights.
    I have gone over the harness looking for a short or grounded wire and have found nothing. I have also gone over the plow with a careful eye and found nothing. My options at this point seem limited. I have looked for what I though it could be but don't want to buy a new isolation module if that isn't what it is. Is there anything else I should be checking before I drop this off at the dealer? Any suggestions are appreciated.
    Thanks,
    Tom
     
  2. no lead

    no lead PlowSite.com Addict
    Messages: 1,308

    did you take the plow light buckets apart? often corrosion will build there. not likely the module is bad.
     
  3. redtred

    redtred Junior Member
    from Maine
    Messages: 6

    I just went out and looked and both sides were very clean. But I did find a broken wire to one of directionals. I'd bet that was it. I fixed it and let the truck run for 20 mins and I still have polw lights. I hope that was it. Thanks for the help! Tom