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Fischer pump motor won't shut off

Discussion in 'Truck & Equipment Repair' started by mikem503, Jan 25, 2015.

  1. mikem503

    mikem503 Junior Member
    Messages: 16

    I am afraid I will burn out my motor. Even when the power switch on the controller is off it still runs. I changed the solenoid and it did not help. Thought it was the solenoid because if I tapped the solenoid it would work. Turn truck on again and the pump motor stays on again.
    Any thoughts?
     
  2. rjigto4oje

    rjigto4oje PlowSite.com Addict
    Messages: 1,295

    Something is shorted. I had this happen I us to run a 30 inch long whip under my floormat until it got corroded I suppose a controler could do this try unplugging it if it continues to run look at the wiring
     
  3. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,977

    Remove the pos cable at the pump, set aside.
    Test light the pins at the solenoid.
    One is gnd....blk/og
    Not sure of the other but it should not be hot without you pressing the controller.
    If it is, you.probably have a short somewhere in the system
     
  4. Brian Young

    Brian Young PlowSite Veteran
    Messages: 3,382

    It has to be a bad rely or solenoid. Either or are not cutting the power to the motor causing it to constantly run.
     
  5. rjigto4oje

    rjigto4oje PlowSite.com Addict
    Messages: 1,295

    Did you read the above post you have a short I dout the selenoid is your problem
     
  6. mikem503

    mikem503 Junior Member
    Messages: 16

  7. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,977

    Would it still be a short if when I tap on the solenoid it works fine for a few mins?

    No it wouldn't. Need to test light it like I said

    The solenoids are close. Some are more h.d. then others.
     
  8. mikem503

    mikem503 Junior Member
    Messages: 16

    The solenoid has 4 pins, which two am I testing? Top 2?
     
  9. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,977

    Already answered
     
  10. mikem503

    mikem503 Junior Member
    Messages: 16

    you said "One is gnd....blk/og
    Not sure of the other"

    Hate to be a pain but that really only references two pins.
     
  11. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,977

    The 2 SMALL PINS.
    How do you think it works?
     
  12. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,977

    This is close to what you have.

    Screenshot_2015-01-25-13-05-26.jpg
     
  13. mikem503

    mikem503 Junior Member
    Messages: 16

    Hey way to be helpful!
    If i knew how it worked I would not be asking for your help!
     
  14. mikem503

    mikem503 Junior Member
    Messages: 16

    Apparently no short.
    Buying another new solenoid!