Pete 579 no left turn signal on trailer

Discussion in 'Peterbilt Forum' started by AlexLia, Oct 9, 2021.

  1. AlexLia

    AlexLia Bobtail Member

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    Hi everyone.
    2017 Peterbilt 579. No driver side turn signal on trailer. Right is good same like other lights. All fuses are good. Plugs and wire to trailer too. Any ideas how to fix?
     
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  3. bad-luck

    bad-luck Road Train Member

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    Have you tried moving the plug where it plugs into the trailer? Try lifting it up, put paper or a plastic zip tie in the socket and plug it back in. If that doesn't work, check if there is power to the light.
     
  4. AlexLia

    AlexLia Bobtail Member

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    It is 100% not trailer issue. It happened with all four trailers I had last week. I am sure it is power related problem.
     
  5. bad-luck

    bad-luck Road Train Member

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    Ok, have you checked the socket that the cord plugs into on the back of your tractor. I had a similar issue with that on my truck. Had no running lights on the trailer. Turned out the socket was bad.
     
  6. AlexLia

    AlexLia Bobtail Member

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    Yes but up to my skills. Pins are in good condition no rust. Wire going under sleeper from that plug have no cuts too in visible areas.
    Is there a chance that it is a relay in fuse box need to be replaced?
     
  7. bad-luck

    bad-luck Road Train Member

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    I doubt it. Do you 4 way flashers work?
     
  8. AlexLia

    AlexLia Bobtail Member

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    Only on another side and everywhere on truck.
     
  9. bad-luck

    bad-luck Road Train Member

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    Ok. She if the back of the socket on the back of your truck is getting power when the turn signal is on.
     
  10. AlexLia

    AlexLia Bobtail Member

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    If you talking about this pin marked with yellow line - it is not.
     

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  11. bad-luck

    bad-luck Road Train Member

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    Yes. Where the wire going into the back of the scoket. Use your test light and it should blink.
     
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