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'91 Pete 379 headlight issue

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Coolbreezin, Oct 30, 2020.

  1. Oct 30, 2020 #1
    Coolbreezin

    Coolbreezin Medium Load Member

    377
    372
    Jun 11, 2016
    Florida
    0
    Hey all. I have 4 headlights. Both my low beams work fine. When I turn on my hi beams, the drivers side low beam go out and no hi beam. But both lights work fine on passenger side. I took both light assemblies apart and compared wiring, all is fine. I changed both lo & hi beams on drivers side, didnt fix problem. Tested all wires on drivers side inside of headlight housing, all is ok. Whats yr thoughts? Where do I look next?
     
    Coolbreezin, Oct 30, 2020
    Coolbreezin, Oct 30, 2020
    #1
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  3. Oct 30, 2020 #2
    FLHT

    FLHT Road Train Member

    1,005
    1,501
    Aug 2, 2014
    0
    Ground your test light and poke the green wire.
    Ground problem
     
    FLHT, Oct 30, 2020
    FLHT, Oct 30, 2020
    #2
    blairandgretchen and Roger McG Thank this.
  4. Oct 30, 2020 #3
    Roger McG

    Roger McG Light Load Member

    165
    198
    Oct 22, 2016
    western mass
    0
    Did you test the driver side harness thru the ground wire in the harness or thru a good clean ground .sometimes the ground in the harnesses go bad
     
    Roger McG, Oct 30, 2020
    Roger McG, Oct 30, 2020
    #3
    FLHT Thanks this.
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