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No lights 96 peterbilt 378

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by killalol, Aug 2, 2022.

  1. Aug 2, 2022 #1
    killalol

    killalol Bobtail Member

    15
    4
    Apr 15, 2022
    0
    Hello,
    So past week I have no brake lights. Or turn signals/hazards.
    The turn signals and hazards turn on but they do not flash .
    I have change the fuse but it still turns on but does not flash. I have also changed the turn signal switch but it doesn’t nothing.

    also reverse lights probably work half the time .
     

    Attached Files:

    killalol, Aug 2, 2022
    killalol, Aug 2, 2022
    #1
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  3. Aug 2, 2022 #2
    Mr Bob

    Mr Bob Light Load Member

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    Mar 17, 2015
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    did you replace the flasher? did you check all your bulbs?
     
    Mr Bob, Aug 2, 2022
    Mr Bob, Aug 2, 2022
    #2
  4. Aug 2, 2022 #3
    lester

    lester Midwest's #1 Feed Hauler

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    Try unplugging your trailer cord and see if everything on the truck works or vice-versa. Narrow down the problem.
     
    lester, Aug 2, 2022
    lester, Aug 2, 2022
    #3
  5. Aug 3, 2022 #4
    killalol

    killalol Bobtail Member

    15
    4
    Apr 15, 2022
    0
    Yes replaced flasher, and bulbs.
    Is there a flasher/hazard relay?

    there was only a 25 Amp fuse in the fuse box
     
    killalol, Aug 3, 2022
    killalol, Aug 3, 2022
    #4
  7. Aug 3, 2022 #5
    killalol

    killalol Bobtail Member

    15
    4
    Apr 15, 2022
    0
    Ok I replaced it with another flasher and it worked now? Weird
     
    killalol, Aug 3, 2022
    killalol, Aug 3, 2022
    #5
    Oxbow Thanks this.
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