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Discussion in 'Chevy Trucks' started by nalegtx, Nov 3, 2010.

  1. nalegtx

    nalegtx Senior Member
    Messages: 139

    :confused:My 2003 Chevy 2500 has aMM2 Fisher 8'HD. Seems like over the last 3 or 4 years whenever i move the plow left right,up or down all the lights on the vehicle inside and out including dash are dimming really bad. I have changed the battery and the alternator with the same results. Anyone have any ideas? I was thinking maybe since i haven't changed the pump filter in a few years....i know i forgot sorry.......that maybe there is a restriction causing the pump to work harder drawing more amperage????? any help is great thank you.......................LET IT SNOW!!!!!!!!!!!!!!!!!!!
  2. RichG53

    RichG53 PlowSite.com Addict
    Messages: 1,135

    Or a bad pump motor...

    Drawing a lot of Amps......
  3. JCByrd24

    JCByrd24 Senior Member
    from Maine
    Messages: 232

    First thing would be to go through every electrical connection between battery and motor on both 12v and ground side and make sure they are clean. Also do this between alternator and battery. Wouldn't hurt to clean that filter too.
  4. mayhem

    mayhem PlowSite.com Addict
    from Peru MA
    Messages: 1,016

    Bad ground. Do the big 3 upgrade.
  5. 496 BB

    496 BB Senior Member
    Messages: 789

    You do have dual batteries right?
  6. vinces designs

    vinces designs Junior Member
    Messages: 14

    switch your alt to a high output factory suck
  7. nalegtx

    nalegtx Senior Member
    Messages: 139

    thanx for all the recommendations...gonna give em all a try this weekend. got a digital volt meter and will run some voltage drop tests and resistance tests on wires...checking all my grounds and maybe some bad wiring maybe
  8. flykelley

    flykelley 2000 Club Member
    Messages: 2,127

    I think we have a winner!