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No Power at 12v Trailer Plug.....09 GMC

Discussion in 'Chevy Trucks' started by G.Landscape, Jan 13, 2013.

  1. G.Landscape

    G.Landscape Senior Member
    from Ontario
    Messages: 847

  2. Triple L

    Triple L PlowSite Fanatic
    from Canada
    Messages: 5,988

    are u using the live all the time or the backup lamp wire? put the truck in reverse and it should power up...
    Did you check the fuse's?
     
  3. Cosmic Charlie

    Cosmic Charlie Senior Member
    Messages: 228

    Trailer plug has separate breakers under the hood & has nothing to do with the tail lights ...
     
  4. G.Landscape

    G.Landscape Senior Member
    from Ontario
    Messages: 847

    OK....so I have basically built my own back up buddy set up. I have checked all the fuses and they are fine. I have it hooked up through a relay using the 12v on the trailer plug as constant power with the reverse terminal as the signal line. When I shift into reverse I can hear the relay turn on but with only 1.5v from the power the lights won't turn on.
     
  5. Triple L

    Triple L PlowSite Fanatic
    from Canada
    Messages: 5,988

    Just use the reverse and don't worry about it... I have had 2 large non led lights hooked onto myn since 2009, are you worried about burning something up?
     
  6. 1olddogtwo

    1olddogtwo PlowSite Fanatic
    Messages: 11,521

    sounds like your tapped into the brake wire.
     
  7. G.Landscape

    G.Landscape Senior Member
    from Ontario
    Messages: 847

    Are you using a relay or just straight wired on? it seems when I try the reverse terminal that the fuse keeps blowing, so something isn't right. These are 2 spot lights at 80w each so they take a good amount of power.
     
  8. Triple L

    Triple L PlowSite Fanatic
    from Canada
    Messages: 5,988

    Striaght wired to the reverse plug with a trailer plug... 2 lights with 2 bulbs each light, very bright, never have had a issue
     
  9. 1olddogtwo

    1olddogtwo PlowSite Fanatic
    Messages: 11,521

    That's only 7 amps each
     
  10. G.Landscape

    G.Landscape Senior Member
    from Ontario
    Messages: 847

    So I had 20amp fuses and they were still blowing. Changed the lights out to 2 50w bulbs and it workes fine now. Still wired through the relay but running off the reverse plug only
     
  11. G.Landscape

    G.Landscape Senior Member
    from Ontario
    Messages: 847

    OK, so I realized the relay is doing nothing now to I took it off. Works good now. Thanks for the help. Here is what I mocked up, I used wood so when I back into something I can replace it instead of having a bend up piece of metal. Also used all the same color wire so if someone steals it they will be really confused. [​IMG]

    Just kidding. I am going to make a proper metal box for it at the shop next week, this was just the **** I had lying around the house.
     
  12. Triple L

    Triple L PlowSite Fanatic
    from Canada
    Messages: 5,988

    is that your truck?
     
  13. Triple L

    Triple L PlowSite Fanatic
    from Canada
    Messages: 5,988

    myn is a 1 wire set up haha, You like complicating things I must say.... :eek:
     
  14. G.Landscape

    G.Landscape Senior Member
    from Ontario
    Messages: 847

    How are you going to get away with less wires then that? 2 Power and 2 ground. and yes that's my truck.
     
  15. theholycow

    theholycow PlowSite.com Addict
    Messages: 1,180

    Just for backup lights?

    I mounted mine to my spring mounts, grounded them nearby, ran the two power wires into a Y-wire, then tapped that wire directly into my trailer harness's reverse wire. 55W bulbs in them, never blew a fuse. Couldn't see them without ducking your head under the truck but they lit up the snow behind me just fine.
    [​IMG]
     
  16. G.Landscape

    G.Landscape Senior Member
    from Ontario
    Messages: 847

    I figured it was best the ground right to the trailer plug instead of having another splice/ground screw to rust and fail. If it was any kind of distance from the plug I probably would have grounded right to the truck, I will head out and grab some pictures soon, just getting dark now.
     
  17. G.Landscape

    G.Landscape Senior Member
    from Ontario
    Messages: 847

    Here is the lights. The fence is approx 130' (40m) from the truck
    [​IMG]
     
  18. Triple L

    Triple L PlowSite Fanatic
    from Canada
    Messages: 5,988

    Exactly how theholycow said... Keep it simple stupid, soo much easier and I dig the clean look most of all...
     
  19. CENTRALIAPLOWER

    CENTRALIAPLOWER Junior Member
    Messages: 9

    LED lights

    I used these lights for back up lights on back of my truck. As you all know LED lights draw very little amps so the can be wired right off the trailer plug reverse wire without losing output like u would a non LED light if a relay wasnt used. Used a sealed plastic box from radio shack and mounted on back all the wires.

    lights.jpg
     
  20. Hysert

    Hysert PlowSite.com Addict
    Messages: 1,264

    center pin on seven prong is back up should power those lights no prob I have 2 on the spreader running off that and the third brake light all running off the bumper. my stock back ups have the hid aways in them and replace in the summer. took the top amber signal out of the front lights and mounted the hid aways in there too peaks out nicely under the western night hawks.