No trailer brake lights!!!!!!

Discussion in 'Freightliner Forum' started by Nazayar, May 28, 2014.

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  1. May 28, 2014 #1
    Nazayar

    Nazayar Bobtail Member

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    May 28, 2014
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    Hello can anyone help figure this tedious headache out???? I have lights to both units tractor and trailer but whenever I apply my brakes I get only the brake lights on the tractor but no trailer brake lights I have connected to several trailers and the issue is the same no trailer brake lights does anyone have a clue what this could be I have a new pigtail and a new connector which the pigtail connects to at the back of the tractor and still no brake lights on the trailer im at wits end with this one!!!
     
    Nazayar, May 28, 2014
    Nazayar, May 28, 2014
    #1
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  3. May 28, 2014 #2
    generallee

    generallee Medium Load Member

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    Jan 4, 2014
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    Sounds like a bad wire going to the tractor connector. Figure out which pin it is and check it for power with someone applying the brakes to confirm or rule out.
     
    generallee, May 28, 2014
    generallee, May 28, 2014
    #2
  4. May 28, 2014 #3
    ipogsd

    ipogsd Heavy Load Member

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    Jun 13, 2012
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    Did you check fuses? Had same issue except lower parking lights.
     
    ipogsd, May 28, 2014
    ipogsd, May 28, 2014
    #3
  5. May 28, 2014 #4
    tucker

    tucker Road Train Member

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    IN
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    Step 1, take a screwdriver and spread the prongs on your pigtail. Each end.

    Step 2, if that don't work, see Step 3


    Step 3, hopefully you don't need to see your trailer brake lights, to know that you're slowing down
     
    tucker, May 28, 2014
    tucker, May 28, 2014
    #4
  7. May 28, 2014 #5
    freightrunner

    freightrunner Heavy Load Member

    722
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    Mar 25, 2012
    Georgia
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    I don't know why but my truck abs relay went out and caused the trailer brake lights to go out.
     
    freightrunner, May 28, 2014
    freightrunner, May 28, 2014
    #5
  8. May 28, 2014 #6
    jerseyguy71

    jerseyguy71 Light Load Member

    106
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    Jun 16, 2013
    plainfield,nj
    0
    i'd check fuses & relays...fuses 1st:biggrin_25525:
     
    jerseyguy71, May 28, 2014
    jerseyguy71, May 28, 2014
    #6
  9. May 28, 2014 #7
    j.r.1981

    j.r.1981 Light Load Member

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    Aug 22, 2012
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    Check where your pigtale plugs into the tractor...had the same problem it was a broken pin on the tractor plug.
     
    j.r.1981, May 28, 2014
    j.r.1981, May 28, 2014
    #7
  10. May 28, 2014 #8
    back40

    back40 Light Load Member

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    Feb 8, 2014
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    The one thing I hate above all others electrical
     
    back40, May 28, 2014
    back40, May 28, 2014
    #8
  11. May 28, 2014 #9
    RSQ20

    RSQ20 Medium Load Member

    315
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    Jul 11, 2013
    Upper Fraser Valley, BC Canada
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    That is an indication of an incomplete ground...

    ....Philip
     
    RSQ20, May 28, 2014
    RSQ20, May 28, 2014
    #9
  12. May 28, 2014 #10
    rank

    rank Road Train Member

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    113,510
    Feb 11, 2010
    50 miles north of Rochester, NY
    0
    I had this with my '98 T800 a few weeks ago. After checking all fuses, pigtail and such, it turned out to be a bad trailer brake relay. It is located in the firewall, in the engine bay, on the driver side on T8.
     
    rank, May 28, 2014
    rank, May 28, 2014
    #10
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