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MM1 3 plug wont operate unless light harness is plugged in

Discussion in 'Fisher Engineering Discussion' started by TMacie, Nov 29, 2014.

  1. TMacie

    TMacie Junior Member
    Messages: 22

    Should the MM1 3 plug plow operate with only the control plug plugged in? This is the only way mine will move. If this is intentional, is there a way to make it work without the light harness plugged in?

    Thanks,
    Travis
     
  2. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,238

    So let me get this right.You are asking if you can run your plow without the light harness plugged in?
     
  3. TMacie

    TMacie Junior Member
    Messages: 22

    Yes, but mostly just to troubleshoot the plow and to understand the theory.
     
  4. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,238

    Is there something wrong with it?
     
  5. TMacie

    TMacie Junior Member
    Messages: 22

    Not right now, but I noticed that when I don't plug in the light harness, the plow wont move.

    I like to learn about things and why they do what they do and why they don't do what they don't do. Education goes a long way if something does break in the middle of plowing.

    Travis
     
  6. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,924

    That's normal, need the light harness plugged in. You can bypass that tho.
     
  7. TMacie

    TMacie Junior Member
    Messages: 22

    Thanks Dieselss, would you mind sharing the info on how to bypass it, or point me in the direction of a line that has the info?


    Travis
     
  8. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,924

    Fishers website has all the wiring diagrams.
    But blk/og from.the pump motor to the small wires going to the lights, back feeds to the Iso module
     
  9. TMacie

    TMacie Junior Member
    Messages: 22

    Gotcha. Thank you!


    Travis
     
  10. buddymanzpop

    buddymanzpop Senior Member
    Messages: 599

    Read the mechanics guide on Fishers web site, you'll understand the theory of operation then.