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Thread: Bought a used mm1 need help

  1. #1

    Angry Bought a used mm1 need help

    Controller works when plow is disconnected but as soon as the plow is connected controer has no power
    WHATS WRONG!!!!!

  2. #2
    Join Date
    Nov 2008
    Posts
    2,494

    Default Re: Bought a used mm1 need help

    That'll be a weak or improper power or ground supply for the harness. Ground usually.

    Which system, relay or isolation? And what is it on?

  3. #3

    Default Re: Bought a used mm1 need help

    its on a 99 f350

  4. #4

    Default Re: Bought a used mm1 need help

    The controler has power until I hit any button then it temp shuts off

  5. #5
    Join Date
    Nov 2008
    Posts
    2,494

    Default Re: Bought a used mm1 need help

    And which wiring system? It makes a difference to the diagnosis direction to a degree. Still have a weak power or ground either way though.

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