One tail light wont turn off

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by MG3, May 16, 2021.

  1. MG3

    MG3 Bobtail Member

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    Jan 20, 2021
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    I have a 2014 Freightliner cascadia dd15, one of my tail lights wont turn off, any advice on how to fix it? When i hit the brakes , blinker & flashers work , but the driver side tail light wont turn off.
     
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  3. CrappieJunkie

    CrappieJunkie Wishin' I was fishin'

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    Check the switch under your brake pedal. When you press the pedal the s3nsor underneath it activates the brake lights. It could be stuck down. Happened in my personal car. Had to change it out. Once it was replaced it went out.
     
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  4. jason6541

    jason6541 Road Train Member

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    Omaha, NE
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    If you mean that light stays on really dim
    You have corrosion in the harness and it is pulling power from another circuit. Check the harness back by taillights usually ziptied to frame or crossmember. Follow wiring up you’ll find it. Pull the weather pak connection apart and willing to bet it is full of corrosion. Also unplug connection at that tail light. All connections should be pulled and di electric grease should be put in them after corrosion removed if any. keeps moisture snd salt out.
     
    Last edited: May 17, 2021
    MG3 and BoxCarKidd Thank this.
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