trailer lights are not working

Discussion in 'Trucks and Trailers' started by bobcatnj, Aug 2, 2005.

  1. bobcatnj

    bobcatnj LawnSite Senior Member
    Messages: 687

    i have a 15 ft open trailer and the light are not working. i checked all the wires and they seem fine (not cut or broke). the only time the lights work is when i put the headlights on, but none of the blinkers work. any suggestions??
  2. BSDeality

    BSDeality LawnSite Silver Member
    Messages: 2,849

    blown fuse probably.
  3. RedWingsDet

    RedWingsDet LawnSite Gold Member
    from Detroit
    Messages: 3,556

    on open trailers, its easier to just re-do the wiring. atleast thats what I did on two of my open trailers.
  4. bobcatnj

    bobcatnj LawnSite Senior Member
    Messages: 687

    i did re-do the wiring. thats why i cant figure it out
  5. RedWingsDet

    RedWingsDet LawnSite Gold Member
    from Detroit
    Messages: 3,556

    check the ground, bulbs, and fuses.
  6. nobagger

    nobagger LawnSite Gold Member
    from Pa
    Messages: 3,065

    bobcatnj, I know Fords had problems with the light switch itself that maybe why it only works with headlights on. Also check the ground for the light connector on the truck. It can only be a couple of things. Check fuses for tail and stop lights. Good luck! :waving:
  7. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Messages: 3,526

    Make sure that the wire harness is grounded good on both ends. 90% of light problems are bad grounds
  8. wushaw

    wushaw LawnSite Member
    Messages: 61

    Only your blinkers don't work which means your brake lights probably don't work either. Did you make sure your bulbs are 1157 or dual fillament bulbs and they are good. You can ohm them out to verify they are good.
  9. RedWingsDet

    RedWingsDet LawnSite Gold Member
    from Detroit
    Messages: 3,556

    its only the brake and blinker on the driverside. passenger side is flawless
  10. greywynd

    greywynd LawnSite Member
    Messages: 132

    Main thing to do is to divide it into smaller pieces and work through each. Separate the truck and trailer, then check the truck over. Use a test light at the trailer connector to see what's working (or not) there. You can also use a battery or battery charger and hook up to the trailer to test the lights there. If it seems to be one light somewhere (say a rear taillight) start at the trailer connector. Make sure there is power at the connection itself. Then look to see if you can find a connection that you can use the test light on in the harness (often there is a join within a few feet of the connector itself.) If you have power there, go to the connection at the taillight and make sure power is getting that far, if it is, take the bulb out, and test the terminals that would touch the bulb...and so on.....

    Just like a big jigsaw puzzle, do it one small piece at a time. I currently have 6 trailers sitting in the yard, all 10+ years old, and the only one that got completely rewired was because there were so many joins in the wires. Here the winter road salt gets into the connections and corrodes them, I used to have to replace the trailer plug on my trucks every year. Now, with some more (and likely better) TLC, I usually get two years out of them.

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