Hazard Lights Hyperflashing

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Melika0829, Jul 7, 2025.

  1. Melika0829

    Melika0829 Bobtail Member

    10
    4
    Sep 28, 2020
    Phoenix
    0
    Been in a shop for 3 hrs tech is fit to be tied. The left blinker is all that's normal. The right and hazards are hyperflashing.

    My company just put in a whole new ELD system last week and had my dash out.
    2023T680 KW
     
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  3. RockinChair

    RockinChair Road Train Member

    5,103
    12,876
    Feb 19, 2012
    CC, TX
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    Hyperflash is usually due to a lack of resistance in the circuit. It happens frequently when incandescent bulbs are replaced with LEDs.
     
  4. Melika0829

    Melika0829 Bobtail Member

    10
    4
    Sep 28, 2020
    Phoenix
    0
    Thanks for trying! In my 2nd shop-at a KW dealer. They can't figure it out yet after a day. Going back in today.
     
  5. Melika0829

    Melika0829 Bobtail Member

    10
    4
    Sep 28, 2020
    Phoenix
    0
    Turns out in the fuse box under the hood, it says left headlamp. That controls the left headlight and right rear light AND the king pin release. It was shorting out, causing my flashers to hyperflash, and my king pin release to stop working!
     
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