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Electrical problem 379

Discussion in 'Peterbilt Forum' started by MSS, Jun 21, 2016.

  1. Jun 21, 2016 #1
    MSS

    MSS Light Load Member

    83
    22
    Feb 16, 2008
    Hagerstown,MD
    0
    Ok guys need your expertise. When i turn on my cab marker lights (on its own switch) the left turn lights come on and the left blinker does not work. With cab lights off the cab lights blink with the left turn signal... go! 2004 379
     
    MSS, Jun 21, 2016
    MSS, Jun 21, 2016
    #1
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  3. Jun 21, 2016 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

    4,188
    6,004
    Aug 26, 2014
    0
    Normally a broken filament in a bulb causing a short. Unplug trailer cord and test. Trailer end first and truck end second. Then left tail light, LF turn, mid turn. Easiest to unplug first. Isolate and fix the problem. Could be a bad ground on a light also.
     
    BoxCarKidd, Jun 21, 2016
    BoxCarKidd, Jun 21, 2016
    #2
  4. Jun 21, 2016 #3
    agitator

    agitator Light Load Member

    65
    80
    Apr 21, 2012
    Ohio
    0
    Sounds like a bad ground....but definitely check the rear tail light bulbs...had a similar thing happen and it was just a tail light bulb..
     
    agitator, Jun 21, 2016
    agitator, Jun 21, 2016
    #3
  5. Jun 25, 2016 #4
    MSS

    MSS Light Load Member

    83
    22
    Feb 16, 2008
    Hagerstown,MD
    0
    Found the problem my pigtail wires were all screwed up, so easy fix this time.
     
    MSS, Jun 25, 2016
    MSS, Jun 25, 2016
    #4
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