2013 Peterbilt 579 LED Headlights

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by PennAve, Mar 18, 2022.

  1. PennAve

    PennAve Bobtail Member

    4
    1
    Mar 18, 2022
    0
    I installed a set of United Pacific plug and play full led headlight assemblies on a 2013 Peterbilt 579. Now when the parking brakes are released and the DRL activate, a portion of the trailer clearance lights come on and stay on until the brakes are set and the DRL turn off. Has anyone seen this issue and/or have a solution? Thanks.
     
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  3. VIKT0R

    VIKT0R Bobtail Member

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    Dec 29, 2021
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    They should be on separate circuits. Most likely someone messed with the wiring. You will have to follow it.
     
  4. PennAve

    PennAve Bobtail Member

    4
    1
    Mar 18, 2022
    0
    They are in separate circuits. We had a similar issue with the factory headlight assemblies. In that case the driver changed the factory turn signal bulbs with led bulbs and the same trailer lights flashed while using the left hand turn signal. Changed it back to traditional bulbs and it worked perfectly fine. Makes no sense. Maybe something in the computer?
     
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