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Blinker & lights activate pump - Fisher MM1

Discussion in 'Truck & Equipment Repair' started by rbergevine, Nov 13, 2008.

  1. rbergevine

    rbergevine Member
    Messages: 62

    Any guidance would be very much appreciated - I'm losing sleep on this.

    Lights off - Plow works perfect
    Parking lights work to the plow.

    These conditions happen whether joystick controller is on or not:
    Blinker on - pump activates and plow moves
    Lights on (lo&hi) - pump activates and plow moves

    All connections seem in order.
    Plow & trucks side plugs seem quite great shape.

    All worked good in July, No changes since except full fluid flush.

    Fisher MM1
    Basics: Fisher MM1 SEHP, 2 plug, 9 pin straight blade on 95 Chevy K1500 4x4.
    Brand new battery 1000A/850 CCA

  2. dirtmandan2

    dirtmandan2 Senior Member
    Messages: 275

    I'd start chasing wires one by one, they have to be getting voltage somewhere, only thing that makes scense is that a couple wires are fused together...
  3. snow7899

    snow7899 Senior Member
    Messages: 234

    This can also happen from a bad ground. Check the main ground where it attaches to the truck.
  4. DeereFarmer

    DeereFarmer PlowSite Veteran
    Messages: 3,296

    Also, make sure the plow side and truck side plugs are very clean and have dielectric grease on them.
  5. rbergevine

    rbergevine Member
    Messages: 62

    Thank you all very much. SOLVED.

    In my haste to put the pump back on after a complete system flush and a new gasket a couple weekends ago, I neglected to reattach the small blk/org ground wire that runs from the coil/solenoid box on the manifold over to the ground on the pump motor. It is mostly black and laid back up against the black angle iron of the headgear frame - easy to miss.

    I studied the schematic intensely trying to figure this out and had determined it was likely a ground issue and then DirtmanDa2 said the same! The gound of the headlights and blinker comes back across that unattached wire to pump neg and then back via the 2-prong plug to the truck side ground.
    The parking lights worked because they have their own ground at the light.

    Basically Operator error and lesson learned - I'll certainly never make that mistak again!

    Thanks to all who replied and an extra thumbs up to DirtManDan2 for nailing it !

    Peace to all.