Trailer brake lights stuck on.

Discussion in 'Freightliner Forum' started by Diesel13230, Nov 30, 2023.

  1. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    ok, well that ain't right. You did mention this happens on multiple trailers?
     
    Last edited: Dec 1, 2023
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  3. Diesel13230

    Diesel13230 Bobtail Member

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    Sorry not when I pull the relay but when I reinstall it. Hold up I’ve been tracing ABS power. Let me back track some.
     
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  4. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Yes, but the brake light relay does not power the ABS. Is the relay marked "Trailer Brake Lights" or something else?
     
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  5. Diesel13230

    Diesel13230 Bobtail Member

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    the ABS relay isn’t marked at all and there is only trailer tail light relay which it checked out ok.
    I was just going off of what relay was turning the lights off. The other relay called “trailer tail lights” wasn’t turning off the lights and I couldn’t find any other relay that made sense as to what ran the stop lights anyway it all makes sense now!!!
    Once I figure out I was on a wild goose chase I started over and got it fixed now. A rookie mistake!!!
    Turns out a wire was in the wrong spot in the junction box at the back of the truck for the trailer. I don’t know if it has been routed this way ever since and my driver just realized but I’ll attach a picture.

    Anyway thanks for the help! You questioned that abs relay and made me stop and think about it. I should have known that red was stop and blue is ABS but I wasn’t thinking.
     
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