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Electrical problems w/ lights on SEHP

Discussion in 'Fisher Engineering Discussion' started by rbergevine, Nov 12, 2008.

  1. rbergevine

    rbergevine Member
    Messages: 62

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

    New home with 970 ft drive so I bought the truck which came with plow over the summer. I read every Fisher doc avail and have lurked this site without asking questions for many months but now I really do need help. I am very hands-on and can usually figure anything out.

    When bought in July I hooked up plow, Hydro did not work but lights worked - they switched as expected between truck and plow, etc. I thought that was cool. I completely overhauled the hydr parts and tested in last weekend. I was ecstatic when the plow now worked as it should - I had done a great job making it right again - so I thought
    Now electrical problems began...

    Lights off - plow functions great - all motions.
    Lights off & Rt turn signal - plow drops or angles Rt
    Turn lights on and plow start movement and no light gets to plow.
    When it begins to move unexpectedly I just shut it down.

    What perplexes me is it worked fine before overhauling the hydro.
    What could be different causing the symptoms above?

    I have schematics but not sure where to start given that the light functions
    had been working fine, I just fixed the fluids, hoses, etc. The only electric I did was disconnect motor leads ... could I have them backward now?
    I inspected all wires, leads, connectors etc and nothing seems obviously wrong/bad.

    Please send me any input you may have.
    As I said, I have read a ton and would not ask unless I've done my homework.
    Thanks you in advance.
  2. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,993

    Sounds like the dreaded DD plug rot.:nod: Check the molded grill plugs, they are known to rot out and cause these kinds of problems.
  3. rbergevine

    rbergevine Member
    Messages: 62

    Thank you all very much. SOLVED.

    I also posted the issue in truck repair forum...

    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.