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lights stuck on

Discussion in 'Western Plows Discussion' started by nmiplowin, Feb 1, 2011.

  1. nmiplowin

    nmiplowin Junior Member
    Messages: 1

    7'6" unimount on 2002 gmc 2500hd.
    I havent had one issue with this plow until now. Just today, I noticed my plow headlights were on. This was a couple hours after I parked it. So I unpluged the bumper plug. I messed with some other stuff in the yard for about 15 minutes. Before I went in, I wanted to see if the headlights would come back on.
    So I pluged the plow light/control harness back in and lights are off. Cool. Took my tools to the shop and came back, light are ON again... This has me stumped. I can see a bad relay and the lights now working...but what would make them stay on continuously?? What should I start checking?
    The truck lights function correctly with the plow lights unhooked. I multimetered the harness pug for voltage to see what pins are hot, but got nothing on any of the pins.. Im confused.
  2. mishnick

    mishnick 2000 Club Member
    Messages: 2,353

    It is probably a bad relay. If the vehicle light switch is turned off then the relays are the only possibility asside from a short in the wires.