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2012 Pete 388 Taillight Wiring Troubles

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mkoski286, Aug 11, 2025 at 9:44 PM.

  1. Aug 11, 2025 at 9:44 PM #1
    mkoski286

    mkoski286 Bobtail Member

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    2012 Peterbilt 388 is having issues tracking down information. At the tail light harness connector at the back of the frame, I have good ground on the white wire, 8v to the left turn, and no power to any wire for marker stop or right turn. Looking for a schematic or ideas for things to check? Front lights and trailer lights all work fine.
     
    mkoski286, Aug 11, 2025 at 9:44 PM
    mkoski286, Aug 11, 2025 at 9:44 PM
    #1
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  3. Aug 11, 2025 at 10:23 PM #2
    JB7

    JB7 Heavy Load Member

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    Follow the wiring/harness from the tail lights forward. There will be at least one connection plug. Pull that apart and test there. If you follow further to the front the harness should go into the chassis node which is on the frame rail across from the l.s. fuel tank. Right turn is B2.
     

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    Last edited: Aug 11, 2025 at 11:02 PM
    JB7, Aug 11, 2025 at 10:23 PM
    JB7, Aug 11, 2025 at 10:23 PM
    #2
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