Lighting ground issue

Discussion in 'Freightliner Forum' started by W Bench Farms, Nov 9, 2021.

  1. W Bench Farms

    W Bench Farms Light Load Member

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    Oct 16, 2017
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    I have been having some weird light issues lately. Seems to be only when hooked to a trailer. Both trailers I use have mostly LEDs. When I hit the brake the right turn signal on truck lights up. If the turn signal is on as well, it will stop flashing when I hit the brake. Doesn't do it when the 4 ways are on. I'm leaning towards a ground issue. Going to check the plug on the truck side to make sure there's a good ground. Make me think it's there since it does it with both trailers. Anything else I need to look for? This is on a 95 FLD 120.
     
    Last edited: Nov 9, 2021
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  3. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    What you need to look for is year/make/model of truck and post it so someone has a chance to help you.....
     
    RocketyMan Thanks this.
  4. W Bench Farms

    W Bench Farms Light Load Member

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    That would probably be a helpful idea. It's been a long week.

    1995 Freightliner FLD 120
     
  5. lilillill

    lilillill Sarcasm... it's not just for breakfast

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  6. lester

    lester Road Train Member

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    Make sure all your lights are working on the truck too. When I have a rear blinker/ brake light burned out or broken wire it does funny things. I also have to run incandescent lights on the rear of my tractor to make the flasher work with all LEDS everywhere else. Even tried the low voltage flasher and still wouldn't work right. 01 Pete.

    Long story short make sure all lights are working first
     
  7. W Bench Farms

    W Bench Farms Light Load Member

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    Oct 16, 2017
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    Found the ground issue. Side marker/turn signal on the trailer was grounded to the mounting screw. Apparently this trailer does not have a ground wire from the plug to the trailer itself. Moved the ground on the light from the screw to the harness and haven't had a problem since.
     
    lilillill and lester Thank this.
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