Why would the driver side turn signal on the trailer work, but not the passenger side?

Discussion in 'Questions From New Drivers' started by Davidbenjamin, May 10, 2021.

  1. Davidbenjamin

    Davidbenjamin Bobtail Member

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    Is it because of a bad electrical connection, and if so, how would I fix it? The four way flashers only work on the driver side of the trailer as well, I.e. they only flash on the driver side when I turn them on. The tractor lights work fine.
     
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  3. Arctic_fox

    Arctic_fox Medium Load Member

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    Check your pigtail pin connection. Look for bent/tarnished/damaged/missing pins or pins with grease on them before anything else. Also check the holes as well to make sure the metal hasn't stripped off for example. Next either get a voltage tester and check the pins are actully giving voltage or replace the pigtail.
    qu27196_800.jpg
    Odds are good that is the problem. If not it may be a blown fuse though thats unlikely if the truck lights work. Otherwise something shorted in the trailer which can be much harder to track down.
     
  4. God prefers Diesels

    God prefers Diesels Road Train Member

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    Pull your pigtail and meter it while you run your blinkers. If you have juice, it's in the trailer. If not, it's in the truck. Work your way that direction. But my guess is a loose/busted wire at the pigtail, or corrosion inside of one of the 7-ways.
     
  5. lovesthedrive

    lovesthedrive Is here to help

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    On a freightliner, the right and left are two different circuits.
    Make sure it isnt a blown fuse. If it has a resetable breaker. lightly touch the outside, if it is hot you have a short
     
  6. Davidbenjamin

    Davidbenjamin Bobtail Member

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    I'm back up and running now. All I had to do was spray some wd40 in the pigtail. Thank you all for helping.
     
  7. kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    You should get a tube of Di-electric grease. Put just a dab in each of the holes in your pigtail.
     
  8. baha

    baha Road Train Member

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    Thanks for ck. back in that you got it working, that turn sig. must be working all the time, if you roll up to a DOT insp. and its quit again you will be put out of serv.
     
  9. Moose1958

    Moose1958 Road Train Member

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    There is another quick test I have done many times over the years. If you have been doing pre/post trips you should have confidence in the tractor systems working right. If the tractor's lights are working but the trailer is not AND you have been doing the pre/post trip inspections on the rig in the days before you can be 99% sure it's in the trailer. If I am where I can I will report that trailer and go slide under another one.
     
  10. skallagrime

    skallagrime Heavy Load Member

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    If all it was was the pigtail, the long term fix is either spread the pins on the trailer pins (if not replacing that socket) or replacing the pigtail end on the tractor

    Both are annoying and it may be cheaper timewise to just buy a new green cord with the ends already done up
     
  11. God prefers Diesels

    God prefers Diesels Road Train Member

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    Exactly what I do. Every time I grease the truck, I pull both my pigtails and grease both ends with this stuff. It's also great for O-rings and glad hand gaskets, because the silicon grease doesn't eat rubber/nitrile/viton/ect.
    https://www.amazon.com/Dow-Corning-Ring-Silicone-Lubricant/dp/B08P5RJVLW
     
    Davidbenjamin Thanks this.
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