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Where's the warning light wire in a 2500HD

Discussion in 'Chevy Trucks' started by Chris-R, Dec 2, 2005.

  1. Chris-R

    Chris-R Senior Member
    Messages: 321

    I'm ready to install a permanent warning light on top of my back rack. I want to connect the light to the dash mounted OEM warning light switch and understand that there's already a wire somewhere above the headliner. I'd rather not disassemble any more of the headliner than I have to so can someone tell me where I might find the wire for the warning light? I have an 05 GMC 2500HD extended cab. Thanks for your help.
     
  2. Plowfast9957

    Plowfast9957 Senior Member
    Messages: 280

    Hey chris I just did mine. If you pull down the headliner in the drivers side its right there taped to the roof. about 6 feet of wire coiled up.
     
  3. flykelley

    flykelley 2000 Club Member
    Messages: 2,124

    Chris Remove the plastic cap over the upper latch on the drivers side, Gently pull the headliner down in the middle of the drivers side. It should be held with a magnet and velcro. The wire is taped to the underside of the roof with blue tape.

    Good Luck Mike
     
  4. sonjaab

    sonjaab PlowSite.com Addict
    Messages: 1,425

    BTW..............You will be looking for a heavy Brown+
    and a heavy Black- wire...................geo:drinkup:
     
  5. Chris-R

    Chris-R Senior Member
    Messages: 321

    Thanks guys. It was right where you said it would be complete with blue tape and all. After finding the wire, I ran into a problem. When I pressed the button on the dash, I couldn't get power. After taking apart half the truck, finding the relay behind the back seat and behind the seat belt mechanism, finding no power to the relay, I found a connector near the emergency brake had become disconnected. The bad part is that I had already pulled the switch from the dash, etc. and I blew a few fuses when trying to troubleshoot. Now I dont have instrument lights and I don't have the little power-on light when I press the emergency light switch but I have everything else including transmission settings, radio, etc. I can't seem to locate a fuse for the instrument lights even after looking at the book and pulling and testing a bunch of fuses in the engine compartment and on the dash side fuse block. Does anyone know if there's a dedicated fuse for the instrument lights?
     
  6. sonjaab

    sonjaab PlowSite.com Addict
    Messages: 1,425

    Chris......

    I forgot to mention the relay was in the left rear B pillar by
    the upper seatbelt anchor.

    Go here for complete VYU plow prep. info."
    http://www.gmupfitter.com Go to publications pg. 27
     
    Last edited: Dec 4, 2005
  7. PerfiCut L&L

    PerfiCut L&L Senior Member
    Messages: 178

    Im confused as what switch your talking about? I didnt know their was a "pre-wired" warding light switch. Can you explain what switch this is and where its located?
     
  8. flykelley

    flykelley 2000 Club Member
    Messages: 2,124

    George
    I didn't have to do anything to my relay, it was already hot. Thats kinda wierd.

    Regards Mike
     
  9. wgsshowe

    wgsshowe Junior Member
    Messages: 10

    The snow plow prep package for 2500 HD GMC comes with a prewired push button switch with indicator light right by the passenger air bag disconnect switch. The wires for this light are termintated in the headliner above the drivers side.
     
  10. Antnee77

    Antnee77 PlowSite.com Addict
    from RI
    Messages: 1,056

  11. golden arches

    golden arches Senior Member
    Messages: 193

    I've been looking for this silly thing for 4 years! Even the local dealer didn't know where it was.

    The diagram indicates it's in the center column.. on ext cab's is it in the front pillar or ?

    thanks all!
     
  12. golden arches

    golden arches Senior Member
    Messages: 193

    Hey guys, went out, pulled the seat belt cover and headliner and there it was!

    It's hooked up and running.. thanks for your insight.
     
  13. csx5197

    csx5197 Senior Member
    Messages: 209

    Does anyone have some pictures of this? I've been trying to find it for awhile now and with Plowing season just around the corner, I'd like to find it. I found what I thought was the wire, but was too afraid to just pull the wire and hope it was it.
     
  14. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Should have been two wires, a brown and a black together. If so, then they're the corrrect ones.
     
  15. 042500hd

    042500hd Senior Member
    Messages: 251

    Nobody could tell me what that button did at 2 GMC dealers. Everyone thought it was for a trailer brake. It's also no where in the manual that I could find.
     
  16. csx5197

    csx5197 Senior Member
    Messages: 209

    B&B, thanks, It might have been, if I recall it was a thick black wire. Just was hoping someone might have had a picture of it, so I could be certain, it might have been two wires.
     
  17. 042500hd

    042500hd Senior Member
    Messages: 251

    If anyone has a pic of how they used that wire I'd like to see it. I don't want to drill a hole in the roof, was thinking of maybe getting the wire out near the cab brake light. Any thoughts?
     
  18. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Thats the way many guys do it. On many trucks it's actually doable to just remove the third brake light assembly and go in through there. I've fished them out with a coat hanger to grab them before...no need to even pull the interior apart. Drill a small hole in the brake light lens and run the wires out through it along with a dab of silicone.
     
  19. mckaloz1

    mckaloz1 Junior Member
    Messages: 3

    Roof Beacon light

    have a 2003 2500HD with plow prep package. Found the wires in the headliner and pulled them down so I can hook up a light bar. No power to either wire. replaced fuse in underhood fuse panel just to be sure. still no power. I know where the relay is in the back d side c or b post. haven't checked that yet because pain in the butt to get to. I've heard something about some disconnected wires near the emergency brake. Any ideas? Have tried flip-flopping wires with and without the OEM switch on and off. Light on switch comes on correctly. Have checked the upfitter page as well and everything seems the way it should be. Have also tried it with my plow hooked up and unhooked. Thanks. Mike