Peterbilt 389 Dim Headlights

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Chevyho, Dec 6, 2017.

  1. Chevyho

    Chevyho Medium Load Member

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    On my 09 389 the low beams are extremely dim, lenses are perfectly clear (not scratched) and I put in new bulbs which made no difference. Any ideas? Is this normal for this truck?
     
  2. boneebone

    boneebone Road Train Member

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    You have a bad ground somewhere, check for breaks in the ground wiring and clean all ground wires.
     
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  3. cmrdev

    cmrdev Light Load Member

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    Can you unplug your headlights and check your voltage with volt meter at the light? If you have proper voltage than yeah, that’s all she’s got. I own a 379 and low beams aren’t that great at all, to be honest, I used a buddies Mack last month and another buddies western star. Neither one of them could I see a #### thing. I wound up just keeping high beams on all the time. 389 seems to be too new of a truck to have grounding issues. I’ll bet it’s just the nature of the beast
     
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  4. Chevyho

    Chevyho Medium Load Member

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    IMG_0382.JPG Yah Im kind of thinking its the way it is, the lights dont look dim when looking at them but cant see anything driving at night. Thats a good idea ill check voltage at light plug.
     
  5. cmrdev

    cmrdev Light Load Member

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    I’m lookin at that beast and I’m sorry to say, those look normal to me. Bada.s.s truck either way dam
     
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  6. Chevyho

    Chevyho Medium Load Member

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    ####, thats what I was afraid of. My 77 w900 had better lights then this thing haha
     
  7. cmrdev

    cmrdev Light Load Member

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    Yeah just doesn’t make any sense these days. Anyhow, just check voltage in the harness or the wires with a sewing needle. Just for piece of mind
     
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  8. magoo68

    magoo68 Road Train Member

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    They may need aiming a buddy complained about his all the time and someone showed him how to aim them and he loves them now .. apparently it takes a bit of work to do it but worth it he said
     
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  9. Chevyho

    Chevyho Medium Load Member

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    Is the headlight aim adjustable on a 389? I thought I read it wasnt, but havent had a look myself yet.
     
  10. magoo68

    magoo68 Road Train Member

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    Under the cover I think he said there was a adjustment wheel but I may wrong
     
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