1. Welcome to PlowSite. Notice a fresh look and new features? It’s now easier to share photos and videos, find popular topics fast, and enjoy expanded user profiles. If you have any questions, click HELP at the top or bottom of any page, or send an email to help@plowsite.com. We welcome your feedback.

    Dismiss Notice

03 2500HD plow/light problems

Discussion in 'Boss Plows Discussion' started by Jimini, Nov 30, 2005.

  1. Jimini

    Jimini Junior Member
    Messages: 2

    Hi everyone, i'm new to the site, so I'm hope you can help. I installed a Boss Poly-V plow and connected the Boss wiring harness up, including 3 spliced wires - 1 for marker lights - 1 for left signal and 1 for right signal. Problem is that both the high and low beam lights on the truck come on when you flip the switch from plow to truck. It doesn't matter whether you turn the highbeams on or off, they still both stay on. Both of the light relays on the harness are both energized all the time. If you pull the low beam relay, the high beams stay on and vice versa. I haven't had the plow on the truck yet, as I have to go and pick it up still so I can't check the plow light operation. Any suggestions you plowing gurus? I appreciate the help. Thanks Jim.

    FSUPERDUTY Senior Member
    Messages: 309

    I had a 03 gmc hd and did the wiring my self.I don't have the instrucions in front of me but I am guesing you have the pigtails misplaced.almost sounds like the day time lamps are maybe powering the headlamps
  3. zsqure

    zsqure Junior Member
    Messages: 19

    Call the dealer, if he/she is any kind of a "good guy" they'll help you out. I kept blowing fuses while attempting to wire my headlights. They fixed me right up.

    JRKRACE Senior Member
    Messages: 172

    Make sure that the right harness was used as GM changed the electrical systems on these trucks from 2002 to 2003...
  5. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 7,902

    Most plow Mfg make pig tails, it's a three way plug, that plugs in to your headlights then you plug in the trucks wiring, then the plows, no splicing necessary.