Trailer light problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by skman, May 24, 2022.

  1. skman

    skman Light Load Member

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    Aug 26, 2013
    Saskatchewan
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    I went to hook up my truck (2016 Pete 389) to the trailer this morning and the trailer lights came on for about a second... then went out.
    I checked all fuses and all checked out good with test light. Even changed a couple to be sure. Still nothing.
    I put a cord tester on the end and the red light at the top comes on and a couple green light on each side of the tester under the red light.
    If I turn my hazards on...two green lights blink and the other two green lights (that were on solid before hitting hazard switch) are also blinking.
    So there is power coming through the cord to some extent...but nothing on the trailer. I tried hooking to another trailer and still nothing so it's def a truck issue.
    Changed power cord with a spare I had in the shop...same thing.
    Not sure where else to check....pigtail going up to cord maybe?
     
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  3. kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    Check the plug on the tractor that the pigtail plugs into yet?
     
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  4. Oxbow

    Oxbow Road Train Member

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    If you tested one red (top pole that is bigger than the rest - ground) and the two wires just below on either side were green - positive - those are your two clearance lamp and marker light circuits. It would seem that the problem is either in the connection from your pigtail to the trailer itself or the trailer. You tried a different trailer, so that leaves me to believe that it could be the connection.

    I would pop out the trailer receptacle and test the back of it next were it me.
     
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  5. skman

    skman Light Load Member

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    Aug 26, 2013
    Saskatchewan
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    I pulled the cord off and plugged the tester in where the trailer cord plugs I and it was the same.
    Im thinking maybe a short in the pigtail...
     
  6. skman

    skman Light Load Member

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    Aug 26, 2013
    Saskatchewan
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    Yeah I'm going to have to check that next. Can't see what else it could be beside maybe chassis node?
     
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  7. spsauerland

    spsauerland Road Train Member

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    Did you check all the fuses in the CLC.
     
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  8. skman

    skman Light Load Member

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    Aug 26, 2013
    Saskatchewan
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    I checked the fuses under the hood and in the cab
     
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