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Plow draining volts

Discussion in 'Truck & Equipment Repair' started by uniquechev, Jan 20, 2012.

  1. uniquechev

    uniquechev Member
    Messages: 66

    Hey guysI have developed a major problem that I nor shops can figure out just wondering if anyone else has had this problem with there plow truck? I'm running a MM1 on a 99 chevy silverado and i know the volts gage will drop down cause of the major draw but lately when the plow angles or goes up the lights dim to almost off etc with the accessories . I had put a new high output alternator in the truck last yr and had it serviced in the spring. took the truck there yesterday and they say its tested ok. any serious idea's as to a solution ??? got another storm rolling in tomorrow morning and would like to try and fix this major issue before it starts. Thanks guys HAPPY PLOWING !!!! ussmileyflag
    Last edited: Jan 20, 2012
  2. oneoldsap

    oneoldsap Senior Member
    Messages: 188

    I was having the same problem . Mine was caused by me putting Hydraulic oil in it instead of plow oil . Changed it today , problem solved ! I asked my dealer if hydraulic oil was okay and he said yes . NOT ! I hate to say it , but I have Fisher oil in my Boss plow now . Now if we could get some snow to plow . I'm refering to this winter as the winter of my discontent ! If I'd known it wasn't going to snow I'd have waited till spring to retire !
  3. uniquechev

    uniquechev Member
    Messages: 66

    I was having problems with the fisher oil so I was told to run ATF fluid. I havent had a problem till this year. Last year with all that snow we go in mass. My question to you now is how would changing the fluid change how the volts draw on the truck ?
  4. chevboy167

    chevboy167 Member
    Messages: 96

    try a clamp on ammeter on the plow wiring & have some one operate all its funtions. check for an excessive draw from the plow motor. motor could be going south on you. and/or a possible clogged pump filter causing pump to work harder than it should.
  5. Kwing1120

    Kwing1120 Member
    Messages: 39

    search for the big 3 upgrade here. it could be the size of wire from your alt to the batt. you may want to upgrade it along with grounds
  6. oneoldsap

    oneoldsap Senior Member
    Messages: 188

    If you put hydraulic oil in it , it will do exactly as what you are describing .
  7. leolkfrm

    leolkfrm PlowSite.com Addict
    Messages: 1,339

    check the grounds on the truck...don't just look at them take the time to pull them apart and clean them...don't forget the fender one...also check the pos on the firewall block.....just fixed the same problem this way....after a new alt cause i thought the old one was going bad.....
  8. uniquechev

    uniquechev Member
    Messages: 66

    checked the grounds and took them off and cleaned them. i did manage to find a broken wire when i checked all of that out but in the storm last night the plow just stopped angling to the left right ... would go up and down but i'm going to take the plow to another shop and see if the motor good or going. i bought the plow used three years ago and it came off a 01 so it might be time to upgrade it .... any other thoughts are more then welcome!!!
  9. EliteSnow&Ice

    EliteSnow&Ice Senior Member
    Messages: 129

    It maybe the solenoid going bad.
  10. samjr

    samjr Senior Member
    Messages: 480

    180 amps comes down to 120amps

    I had my truck on test the other day and the fisher motor (new 2 weeks ago) Pulls 185amps @ first hit of the botton and gos down to 120 amps i just put a 200 amp ALT on my truck and can still see things go dim
  11. leolkfrm

    leolkfrm PlowSite.com Addict
    Messages: 1,339

    when was the last time you cleaned the system, and replaced with plow oil?
  12. justme-

    justme- 2000 Club Member
    Messages: 2,138

    Fluid and filter in the plow- motor brushes in the plow worn bad could cause excessive draw (making a short), dirty power connections ground and feed. How about connections to the batteries (all clean) and alt?
  13. birddseedd

    birddseedd PlowSite Veteran
    Messages: 3,516

    battery coudl be going bad? sure its getting good charging, but a good alt cannot make up for a failing batter in any case.

    shrugs. im just a noob.
  14. JimBostick

    JimBostick Junior Member
    Messages: 2

    Voltage problem

    Have your battery load tested, that is the most likely cause. If the battery is ok ck the amp draw on the motor with a clamp on ammeter, should be no more than 180 amps when lifting.
  15. Laszlo Almasi

    Laszlo Almasi Senior Member
    Messages: 326

    I too think it may very well be a wiring/connectivity issue. And it may very well be your battery as well.
  16. ratherbfishin

    ratherbfishin Senior Member
    Messages: 201

    I posted a thread (In Fisher section) with a similar situation.My 2011 GMC drains down voltage, as usual,but takes a long time(2-3 minutes) to recover to normal.Fisher dealer said it was normal ???-GMC dealer said it checked out o'k.I guess the newer charging systems only charge battery as needed.I checked out another similar set up to mine on dealer lot...It was way better than mine.The excuse...the truck has been sitting for a while,so computer is telling the alt.to put out max to charge battery.WTF gives??
  17. Laszlo Almasi

    Laszlo Almasi Senior Member
    Messages: 326

    What is the reserve capacity of your batteries?
  18. Antlerart06

    Antlerart06 PlowSite Veteran
    Messages: 3,437

    Check your plow motor could be dragging if does it will draw more amps
    Check the all grounds
  19. Eronningen

    Eronningen Senior Member
    Messages: 442

    I 2nd the battery check. I've had that been the root caue to many of my problems.

    Lastly, and I'm sure you already checked this but check the volt drain plug on the system and make sure its tight and/or in good working condition.
  20. ratherbfishin

    ratherbfishin Senior Member
    Messages: 201

    Battery checked out ...what the hell is the "volt drain plug"?