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Turn signal vs trailer wiring?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Insmnyk, Jan 10, 2024.

  1. Jan 10, 2024 at 5:45 PM
    #1
    Insmnyk

    Insmnyk [OP] Member

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    So my left turn signal it stuck on. I found this thread. Symptoms are about the same and the issue was traced to the trailer wiring harness. I also had an issue where I tried to rent a uhaul motorcycle trailer and couldn't because my trailer wiring is non-functional.

    Sounds to me like its time to rebuild my trailer wiring harness.

    Any suggestions or tips? 2008 Tacoma pre-runner w/ four banger.
     
  2. Jan 10, 2024 at 6:26 PM
    #2
    Nessal

    Nessal Well-Known Member

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    You can test it with a voltmeter. It should read 12v on each of the lead for the turn signal and brake lights when actuated/applied. That should tell you if the controller is working on the truck end. For the trailer end, you can use a 12v power source and put a lead on the ground and then each of the other contacts to see if they light up.
     
  3. Jan 10, 2024 at 6:44 PM
    #3
    Insmnyk

    Insmnyk [OP] Member

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    Thanks Nessal, I'll throw a spare battery to charge and dust off my multimeter.
     
  4. Jan 10, 2024 at 7:07 PM
    #4
    Nessal

    Nessal Well-Known Member

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    Do you have a 4 wire or 7 wire? You posted in the 1st gen forum so I assume you will have a 4 wire but you said your Tacoma is a 2008 and I believe those are 7 wire. They sell this item to test your wiring on the rig side as well. I have never used it since I have a multimeter but this takes the guess work out. I had some issues with my trailer as well and it turned out to be the controller after going through all of the test procedure. Was a real head scratcher since my issue was intermittent.

    https://www.amazon.com/NEW-SUN-Trai...2789945&mcid=6be5dfc16b363ef7bf2c01164de7e59a

     
  5. Jan 10, 2024 at 7:35 PM
    #5
    Insmnyk

    Insmnyk [OP] Member

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    4 wire on mine. Oh, man that Harbor Freight one for 4$ is gonna help. I didn't even know those existed. Tha!
     
    Nessal likes this.

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