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Fisher w/Headlight Problem

Discussion in 'Fisher Engineering Discussion' started by snownj, Dec 9, 2009.

  1. snownj

    snownj Junior Member
    Messages: 21

    We have a Fisher MM2 3 wire, Isolation Module, on a 2002 F-450 with a lighting problem.

    When the plow is connected, only one side headlight switches over from the truck to the plow. The other side continues to be lit on the truck.

    Anyone seen this type of problem before ?
  2. wirenut

    wirenut Senior Member
    from nh
    Messages: 507

    check wiring and iso
  3. RepoMan207

    RepoMan207 PlowSite Fanatic
    from Maine
    Messages: 5,031

    New install?
  4. abbe

    abbe Senior Member
    from RI
    Messages: 719

    configuration plug?
  5. snownj

    snownj Junior Member
    Messages: 21

    Thanks, RepoMan207: Not sure when it was installed. We just bought the truck last summer.
  6. snownj

    snownj Junior Member
    Messages: 21

    Thanks abbe. I just did a search on configuration plug and found the Fisher Mechanics Guide so we will go through the troubleshooting.

    We always ran Fishers but this is the first one we got with the isolation module.
  7. snownj

    snownj Junior Member
    Messages: 21

    The trouble was found at the truck headlight. The vehicle harness was plugged into the headlight instead of the position 3 harness.

    Thanks to all for the advice.