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Trailer wiring

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 90K5, Jan 2, 2001.

  1. 90K5

    90K5 1/2 ton status

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    I got a trailer at a junkyard for $55 today and it was in pretty goos shape except the wiring was trashed. i picked up new light, and a wiring harness today and put them on, and it works, but when i have one blinker on in my truck, both of the lights flash on the trailer. Does anyone know what causes this and what I have to do to fix it?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Sounds to me like one of the wires is hooked up the wrong way. Bad thing about trailers, the wiring, however simple, always seems to be a problem. If they are both flashing, the ground is ok...but it sounds like maybe one of the wires is connected to the truck wrong, like both of the trailer wires are hooked to one side of the signal on the truck side. Or if they do it no matter which directional is on, then perhaps you have both wires hooked up to both turn signals...did you buy one of those plug in adapters that lets you install the flat 4 connector without cutting the truck wiring??

    Dorian
    My K5 and Chev/Olds links: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  3. 90K5

    90K5 1/2 ton status

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    I fixed it, but I don't know how. I turned on the flashers and then the blinker, and it worked.

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    You know it will come back next time you go to use the trailer don't you? : ) My trucks left front turn signals recently decided to once in awhile ignore my requests to flash. Flip the switch right, then left and they usually work again. Weird that onlt the rear works 100% of the time, and not the fronts, since they are on the same circuit. your trailer sounds the same way. nothing really could have changed you'd think, but there you are, they work. No chance of a short or anything where the wiring was added?


    Dorian
    My K5 and Chev/Olds links: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  5. 90K5

    90K5 1/2 ton status

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    I looked at the wiring really good and it seems OK. I didn't put rubber things in the holes it goes through, but I don't think it matters, i did a good job putting it on...

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  6. Smitty

    Smitty 1/2 ton status

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    I've had that problem caused by a bad ground between the trailer and the tow vehicle. You'd think that a good ground is made between the ball and the trailer but it doesn't always work that way. You end up with a problem that comes and goes.

    Smitty
     
  7. Michael

    Michael 1/2 ton status

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    It's always a good idea to run a good ground wire from truck to trailer and not just depend on the ball making a good ground. Sometimes the lights will try to gound thru themselves....

    Michael[​IMG][​IMG]
     
  8. pr1aw

    pr1aw 1/2 ton status

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    I had that problem also. I installed a heavy duty flasher that fixed it.
     
  9. Smitty

    Smitty 1/2 ton status

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    If you have the common 4 wire hook-up the white wire is usually the ground.

    Smitty
     
  10. laketex

    laketex 3/4 ton status

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    hey man I do that for a living and if you have any other probs, I can come up there and rig ya up. later on.

    Bryan

    [​IMG]
    Durant, Ok
     
  11. 90K5

    90K5 1/2 ton status

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    I have the 4 connector thing, with the white ground. The old harness wasn't even grounded, the ground wire wasn't even stripped. If I have any other problems I can't figure out, I'll ask you laketex, thanks

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     

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