Tail lights and front marker lights stuck on

Discussion in 'Peterbilt Forum' started by Josiah Harder, Dec 23, 2022.

  1. Josiah Harder

    Josiah Harder Light Load Member

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    Ignition is off and all switches are off but still can't get these lights to turn off. It's odd because after I realized they wouldn't turn off I left the yard for 5 minutes and came back to them off but then several hours later they were on again.

    I found the fuse that will turn them off its labeled 1 in my picture. Though last night in the dark I could see even with that fuse out the tail lights had some residual power and were on but very dim. So I took fuse number 2 out and the left taillight went out completely and fuse 3 took out the right taillight completely.

    Even the licence plate light is stuck on when fuse number 1 is in. Really don't wanna bring the truck to the shop for something silly like this haha IMG_20221223_091225.jpg IMG_20221223_085904_edit_130565770507160.jpg IMG_20221223_085953~2.jpg
     
  2. Josiah Harder

    Josiah Harder Light Load Member

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    Update: I took the relay out labeled marker clearance lights and that also caused the lights to go out even with fuse #1 inserted. So maybe it's the relay that's gone bad idk
     
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  3. Josiah Harder

    Josiah Harder Light Load Member

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    Update: I tried a new relay but that didn't resolve the issue
     
    Last edited: Dec 23, 2022
    bullhaulerswife Thanks this.