Trailer lights acting very weird any help?

Discussion in 'Volvo Forum' started by RustyNailStepDeck, Mar 28, 2020.

  1. RustyNailStepDeck

    RustyNailStepDeck Bobtail Member

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    Hi I got a 06 vnl 670 and s 2016 benson drop deck. All lights and signals work on the truck but not the trailer.

    Left turn signal works.
    Right turn signal doesnt work at all.
    ALL Flashers work including right side when the head lights are off only.
    When running light or head lights are on only the left turning markers work.

    Checked fuses, cleaned the pig tail on both ends.. any ideas?
     
  2. jammer910Z

    jammer910Z Road Train Member

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    Try a different pig tail if you have access to one.
    That will eliminate the most simple problem of a broken/frayed ground inside the wiring.
    Could be bad prongs, too.

    Start there.

    If that doesn't work, it's likely a ground issue somewhere on the trailer.
    Almost always is.

    If the tractor is correct, then it's the conduit (pig tail) or the receptor.
     
    Dino soar and Bean Jr. Thank this.
  3. RustyNailStepDeck

    RustyNailStepDeck Bobtail Member

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    Thanks buddy, yeah that was my next step. I'll do that tomorrow morning.
     
  4. "semi" retired

    "semi" retired Road Train Member

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    Bad ground does funky things.
     
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  5. Boom Tube

    Boom Tube Light Load Member

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    I usually open up the trailer prongs a bit with a knife or screwdriver and that fixes the issue.
     
    jammer910Z Thanks this.
  6. "semi" retired

    "semi" retired Road Train Member

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    I used to do that until you break half a prong off. We used to put a big paper clip in the plug. Cop will write you up for that today.
     
    jammer910Z Thanks this.
  7. Boom Tube

    Boom Tube Light Load Member

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    At that point, the prongs have been messed with so much, so the unit would definitely need to be replaced.
     
  8. HoneyBadger67

    HoneyBadger67 Road Train Member

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    I've learned that just pushing a narrow bladed screwdriver into the slot works much better than trying to twist it. Just a bit of inward force but no actual torque. Too many "DOH!" moments with twisting and breaking....
     
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