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Electric Hoist Stalls Truck

Discussion in 'Truck & Equipment Repair' started by BuffaloJoe, Mar 11, 2011.

  1. BuffaloJoe

    BuffaloJoe Member
    Messages: 51

    I've got a GMC 3500 with an electric/ hydraulic dump body on it. Whenever I go to raise the hoist, the head lights come on dimly and the horn sounds and if the button is held for anymore than 2 seconds, the truck stalls. The solenoid on the hoist motor clicks even though I just replaced it. The power wire for the hoist is right to the positive end of the battery, and it is ground is through the pump/ motor and right to the frame. All of the connections are clean and tight. I am guessing that somewhere there is a wire somewhere that is lightly grounding, but there is miles of wiring on this truck and don't want to tear apart everything. Just seeing where I should start if anybody has any insight.

    Thank You

    PS. There is no problem with the hoist, because I hooked it up to another battery and it works flawlessly. I have also unhooked the trucks positive battery cable from the battery and it still doesn't work when it's grounded to the frame.

    NICHOLS LANDSCA PlowSite Veteran
    Messages: 4,286

    I'm going to say bad ground. Try hooking some jumper cables up from the pump to the ground on the battery to check.
  3. CGM Inc.

    CGM Inc. PlowSite Veteran
    from Ontario
    Messages: 3,589

    Bad Solenoid?
  4. forbidden

    forbidden Senior Member
    Messages: 392

    Bad ground almost for certain. Nichols Landsca nailed the exact way to test it. A good ground is not about connecting it to the largest metal as close as possible, it is about the lowest amount of resistance back to the source. I would take a close look at the ground from the battery to chassis.
  5. no lead

    no lead PlowSite.com Addict
    Messages: 1,308

    bad is your ground.:nod::nod:
  6. BuffaloJoe

    BuffaloJoe Member
    Messages: 51


    Yep it was the ground. The truck has two wires off the - side of the battery, a heavy and a light gauge. It was the light one that went to the body of the truck. I cleaned and greased them both and shes good to go. Thanks for the help everyone.
  7. forbidden

    forbidden Senior Member
    Messages: 392

    Upgrade that ground to a far larger wire. You are basically giving your truck a heart attack with that small guage wire from battery to chassis.