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Plow lights not working

Discussion in 'Fisher Engineering Discussion' started by SuperDuty, Dec 6, 2007.

  1. SuperDuty

    SuperDuty Senior Member
    Messages: 147

    When I plug the lights in they don't come on, but the directionals do work! Anyone have any ideas as to what the problem maybe???

  2. Gicon

    Gicon Senior Member
    from MA
    Messages: 989

    Tighten up your ground wire on the plow, and make sure theres nothing inside your plugs. Check and grease your connections well.
  3. harley hauler

    harley hauler Senior Member
    Messages: 214

    I have the same problem got lights only when switched to high beam. I have a similar tread on this. A couple of my replies said to flip the light connection over?? It's in the chevy forum under Help NBS with fishers
  4. SuperDuty

    SuperDuty Senior Member
    Messages: 147

    Checked the ground connection(GOOD), cleaned out the plugs(GOOD), and put in new grease and they still won't switch on????
  5. Arc Burn

    Arc Burn PlowSite.com Addict
    Messages: 1,138

    Is this an Isolation module or relay set up?
  6. SuperDuty

    SuperDuty Senior Member
    Messages: 147

    Pretty sure I have modules under the hood!!! I've cleaned them too, which may mean I have a bad one?
  7. MOXIE

    MOXIE Member
    Messages: 38

    Fast way to determine if truck or plow is at fault

    Super Duty, Connect large power cord and solanoid cord to truck. clean of the face of the truck side lighting harness. you will see ### on the pin connections. using a small piece of wire jump female pin #2 to Female pin #7. This will complete the ground circuit, telling the E-Force box to switch the lights from truck to plow. The headlights ground thru the lighting harness and the run/dir lights ground thru the power cord. Try it and get back to me. MOXIE
  8. SuperDuty

    SuperDuty Senior Member
    Messages: 147

    Grabbed our mechanic from work yesterday, and found a white wire broken that provides power to the cube relay to make the lights switch. I would have repaired it but the original installer buried the module to where you can't get at it. I just made a jumper and jumped the green and yellow wires, which switched the lights. Taking it back Sat. to have them look at it!!!