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MVP Plus Draining batteries

Discussion in 'Western Plows Discussion' started by mini_blaine, Feb 12, 2013.

  1. mini_blaine

    mini_blaine Junior Member
    Messages: 15

    Hello,
    I am having a hard time figuring out why my plow is draining the batteries when everything is turned off.

    I have a 2000 F250 7.3L and the plow will drain my batteries right down to nothing in about 10 hours when it is just sitting.

    If anyone could give some ideas as to why that would be great.

    Thanks
     
  2. Antlerart06

    Antlerart06 PlowSite Veteran
    Messages: 3,437

    Does you plow work when your key is off
     
  3. mini_blaine

    mini_blaine Junior Member
    Messages: 15

    No it does not. There is power to the solenoid on the plow motor when everything is turned off.
     
  4. Antlerart06

    Antlerart06 PlowSite Veteran
    Messages: 3,437

    What model and year of the plow
     
  5. mini_blaine

    mini_blaine Junior Member
    Messages: 15

    It is the 2006 MVP Plus 9' 6".
     
  6. Antlerart06

    Antlerart06 PlowSite Veteran
    Messages: 3,437

    Is there power on both side of the solenoid is it open if so
    Then you might have a bad modular unit
     
  7. mini_blaine

    mini_blaine Junior Member
    Messages: 15

    Nope just on the one side the the battery is connected.

    It seems to me the the isolation unit would cut the power to the plow when everything is turned off.
     
  8. Antlerart06

    Antlerart06 PlowSite Veteran
    Messages: 3,437

    Test light and check all connections
    Im stump then
    Maybe someone on here had the same problem will help
     
  9. mini_blaine

    mini_blaine Junior Member
    Messages: 15

    Yeah I have no idea, I've been over everything so many time with a tester i don't know what else to do. All connections are good.
     
  10. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    which wire has the pwr,,,bwn/rd or the bk/or???
     
  11. jasonv

    jasonv PlowSite.com Addict
    from kannada
    Messages: 1,114

    Are you certain that its the plow that is responsible?
     
  12. mini_blaine

    mini_blaine Junior Member
    Messages: 15

    There is power at the large red wire from the battery to the solenoid, and power at the small red wire and the small black wire at the solenoid.

    Yes I'm fairly sure that it is the plow, the batteries only drain down when connected to the truck. If the plow is not connected the truck can sit for weeks without any problem.
     
  13. jasonv

    jasonv PlowSite.com Addict
    from kannada
    Messages: 1,114

    You say you've gone over everything with a tester... what kind of a tester?
    Voltmeter? Ammeter? What?

    With the plow OFF the truck, you need to test the plugs like this;

    Find out which pins on the TRUCK side are positive voltage. Voltmeter against the frame. Make a note of every pin with a reading other than "0 volts".

    Second, with an AMMETER, test the rest of the pins for continuity with negative/chassis. Make a note of every pin with continuity.

    Now on the plow side with your AMMETER, test all of the corresponding POSITIVE volt pins against all of the chassis/negative pins AND against the plow frame body itself. When you find continuity, physically follow that circuit to your problem.
     
  14. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Ammeter for continuity? That's new to me....

    Must be a norh of the border thing
     
  15. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,992

    Let's all calm down with a little meditation, eyes closed, back straight and repeat after me..................Ohmmmmmmmmmmmmm
     
  16. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    You'd be surprised at the things you'd find. Well not really.

    Thanks that really helped, I feel mulch better now. :D


    Disconnect the plug at port #1 (if it's a 4 port) or port C (if it's a 3 port) and see if it still drains the battery overnight.
     
  17. mini_blaine

    mini_blaine Junior Member
    Messages: 15

    Does anyone have a diagram of which pins are suppose to be hot and ones that are not.

    I have the 4 port isolation on the truck and 3 port on the plow.
     
  18. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,992

    Listen to B&B's advice. it's the most sensible thing said in the entire thread. Stop looking for an ammeter, try it and report back.
     
  19. mini_blaine

    mini_blaine Junior Member
    Messages: 15

    I did some testing for ohms on the coil solenoids and it appears that the one that controls the lower function is bad. Could that be the problem that it is calling for power when the unit is off?
     
  20. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    How could it,,,,need to find out what wire is hot after the ign is off. Something is on somewhere. I asked what wires have pwr at the solenoid when its off.
    Now,,,,turn you tk off, and unhook all grill connectors do you hear anything "clicking". That might be a place to start