Tail light problems

Discussion in 'Ask An Owner Operator' started by Georgiaboy 1975, Oct 19, 2021.

  1. Georgiaboy 1975

    Georgiaboy 1975 Bobtail Member

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    Oct 19, 2021
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    I have a 2001 freightliner FLD 120. My problem is with the right turn signal. I have everything on the back of the truck but the right turn signal. If I unplug the light and check with a test light I have a right turn signal. But as soon as I plug the light up no right turn signal. I've changed the light out and same thing is happening
     
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  3. RocketScott

    RocketScott Medium Load Member

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    Apr 10, 2013
    Kentucky
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    Did you check the ground side of the plug or just the power side?
     
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  4. GYPSY65

    GYPSY65 Heavy Load Member

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    Nov 16, 2012
    SW FLA
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    Agree
    If you’re grounding the test light to the trailer it won’t detect a break in the actual ground wire needed for the light
     
  5. Georgiaboy 1975

    Georgiaboy 1975 Bobtail Member

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    Oct 19, 2021
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    Test light it grounded to frame of the truck.
     
  6. ProfessionalNoticer

    ProfessionalNoticer Heavy Load Member

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    Apr 25, 2021
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    Attach the test light to the same ground that connects directly to the bulb. I bet that ground is your issue. You can also run a new ground wire to the bulb from wherever your test light is grounded at to verify.
     
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