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Fisher MM1 Plow -- Ground Wire melted on plow frame after installation

Discussion in 'Truck & Equipment Repair' started by francurran2003, Dec 8, 2005.

  1. francurran2003

    francurran2003 Junior Member
    Messages: 5

    I switched my plow from a 90 GMC blazer to my 90 GMC k1500

    When I hooked all the wiring back up and went to raise the plow-- the ground wire on the plow frame started to melt

    What did I do wrong?

    Any thoughts???
  2. wirenut

    wirenut Senior Member
    from nh
    Messages: 529

    loose or bad connection..?
  3. If it started to melt it immediately, I would say you have a wire on backwards. If you supply voltage to a ground, and there is not fuse, it will find the weakest link and destroy it.
  4. francurran2003

    francurran2003 Junior Member
    Messages: 5

    Now that you mention it---

    The only thing I can think of is that there is a relay coming off the battery with 4 posts--

    2 high voltage-- (1 off the battery & 1 to the plow-- both positive I assume)
    2 low voltage -- 1 of which was the ground wire-- I hooked a ground wire up to the negative on the battery-- b/c the schematic onfisher online --

    I got the schematic off of :


    Could I have charged it by hooking it up to the negative post on the battery?