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Plow light Issue Ultramount

Discussion in 'Western Plows Discussion' started by Ant118, Dec 19, 2013.

  1. Ant118

    Ant118 Senior Member
    Messages: 184

    Well on my 2000 dodge with a 9' Pro Plus the plowlights arent working. I keep checking the 10amp fuse for the lights and they keep blowing. Seem like they work until you hit a bump. Im thinking there is a short somewhere. Been looking through the harness with still no luck. Any thoughts?
     
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,003

    Start by following the wiring harness from the lights, to the ISO mod. Then out out the mod to the trk lights and plow lights. Look at any place where the wiring rubs. But hate to say it, welcome to the world of electrical diag
     
  3. mishnick

    mishnick 2000 Club Member
    Messages: 2,243

    You need to narrow things down. Does this affect only the plow lights or the truck too? According to the 3 port schematic that 10A fuse provides power to the isolation module to pass down the line to the plow headlights. All the truck headlights do when the plow is connected is activate relays in the iso module to send that fused power out to the plow. So if the fuse is blowing I don't think it will be a problem in the truck lights or the wires between headlights and isolation module. I would be looking at the cable the cable that plugs into port A on the iso module and runs out to the grill to plug into the plow. if you have had a rad replacement or something they probably pinched the wires under a bolt. Pull the whole cable out and examine it. If that is OK then move on to the plow side that this plugs into and examine it carefully, inch by inch. You should open the Nighthawks too and see that nothing is shorting out or exposed inside there.
     
  4. Ant118

    Ant118 Senior Member
    Messages: 184

    Thanks guys. I figured out it was the plug into the module. Replaced and works 100%
     
  5. mishnick

    mishnick 2000 Club Member
    Messages: 2,243

    Strange that an unplugged cable would blow fuses?
     
  6. Ant118

    Ant118 Senior Member
    Messages: 184

    a couple of the pins were corroded going into the module.
     
  7. snowish10

    snowish10 PlowSite.com Addict
    Messages: 1,082

    I had kind of the same probelm, My problem was the pins n the truck/plowside connector were corroded. Or you might want to check if you wiggle around the truck plowside and the lights work, one of you connectors are going bad-that was my other problem.