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Headlight problem

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mississippi129, Dec 5, 2018.

  1. Dec 5, 2018 #1
    Mississippi129

    Mississippi129 Bobtail Member

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    Dec 5, 2018
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    Headlight problems
    I have a 94 Peterbilt 379.
    When driving on a rough road, the lights flicker. Even if the switch is turned off. Any ideas?
     
    Mississippi129, Dec 5, 2018
    Mississippi129, Dec 5, 2018
    #1
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  3. Dec 5, 2018 #2
    FdEF

    FdEF Light Load Member

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    Ogden, Ut
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    I'd put my money on a bad switch if it's doing it with the switch off
     
    FdEF, Dec 5, 2018
    FdEF, Dec 5, 2018
    #2
  4. Dec 5, 2018 #3
    AModelCat

    AModelCat Road Train Member

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    I'd consider a short to power. Check for rubbed wiring on the harnesses.
     
    AModelCat, Dec 5, 2018
    AModelCat, Dec 5, 2018
    #3
  5. Dec 5, 2018 #4
    Ridgeline

    Ridgeline Road Train Member

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    The cable from the frame to the hood may be bad.

    Doubt it is a switch.
     
    Ridgeline, Dec 5, 2018
    Ridgeline, Dec 5, 2018
    #4
  7. Dec 5, 2018 #5
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Check the relay on the circuit box. The relay can get hot. Check the pins on the relay, clean them or change for another relay on the panel. Most of the relay on the panel are the same. I have the the same make and year of your truck. And have had a similar issue. The toggle switch may be an issue also but I never had it with mine.
     
    Last edited: Dec 5, 2018
    Diesel Dave, Dec 5, 2018
    Diesel Dave, Dec 5, 2018
    #5
  8. Dec 5, 2018 #7
    Mississippi129

    Mississippi129 Bobtail Member

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    Dec 5, 2018
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    You were right!! I put in a new switch this afternoon... so far so good!! Thanks for the input y’all!!
     
    Mississippi129, Dec 5, 2018
    Mississippi129, Dec 5, 2018
    #7
  9. Dec 5, 2018 #8
    Mississippi129

    Mississippi129 Bobtail Member

    11
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    Dec 5, 2018
    0


    Thanks! It was the switch. I’ve had a lot of people tell me I should “update”, but the old girl is paid for. I frame about 300,000 ago. New 13 speed transmission less than a year ago... I think I will keep my seat.
     
    Mississippi129, Dec 5, 2018
    Mississippi129, Dec 5, 2018
    #8
    Diesel Dave Thanks this.
  10. Dec 5, 2018 #8
    bigguns

    bigguns Road Train Member

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    Update for what? A newer and high dollar headache. Them computer mechanics at the dealerships would never have found that. Keep what you got. Be happier.
     
    bigguns, Dec 5, 2018
    bigguns, Dec 5, 2018
    #8
    Diesel Dave Thanks this.
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