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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    Oct 6, 2021
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    I will try tmr. Thank you.

    What do you think about an idea to directly connect this pin with trailer tail lights? Will it work?
     
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  3. bad-luck

    bad-luck Road Train Member

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    They actually sell a tester that plugs right into the trailer socket. Here is one. And your very welcome! Screenshot_20211009-203817_Chrome.jpg
     
  4. AlexLia

    AlexLia Bobtail Member

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    Oct 6, 2021
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    I already know that there is no power on that pin for trailer left turn signal. Why to buy it?
     
  5. bad-luck

    bad-luck Road Train Member

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    Ok, you need.ro see if there is power to the back of the socket on your truck. If there is not. It's could be the wire to the socket. Does your turn signal work on.the back of the tractor?
     
  6. AlexLia

    AlexLia Bobtail Member

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    Oct 6, 2021
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    OK.
    Yes. Tractor signals works perfect.
     
  7. bad-luck

    bad-luck Road Train Member

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    Ok, I would check the back of the socket tomorrow and start there.
     
  8. AlexLia

    AlexLia Bobtail Member

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    Oct 6, 2021
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    OK. Thanks.
     
  9. Six9GS

    Six9GS Road Train Member

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    On my Volvo, I have separate fuses for trailer lights. And, separate fuses for both right and left sides. I had the same basic deal, no trailer turn signal or 4 way signal on the right side. Had them on left side and all the tractor lights. It was the fuse. Replaced it and everything's been fine since.
    Unsure if a Pete will have a similar set up, but it seems likely to me.
    Or, you could simply not make any left hand turns!!! (o:
     
  10. bavarian

    bavarian Heavy Load Member

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    I have a Pete 387, quite a few years older, but it may help. Mine has a separate relays box under the cab. Once a relay got hung up and the turn signal was on solid. On the trailer only. A new relay solved the problem.
    It takes two bolts to open it.
     
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