379 no headlights

Discussion in 'Peterbilt Forum' started by Dockter94, Sep 24, 2020.

  1. Dockter94

    Dockter94 Bobtail Member

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    Sep 24, 2020
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    Hey guys I’m new to the forum!
    I have a 02 379
    I lost my head lights the other day
    Fuses and relays are good
    Switch is good however I noticed two of the wires look like they got hot.
    I test lighted the wires head light wires at the point they go into the main harness...
    Any ideas on how to further diagnose the bowl of spaghetti I’m dealing with???? Thanks in advance for any ideas
     
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  3. PSM379

    PSM379 Heavy Load Member

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    Apr 19, 2019
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    So there is power at the switch? The plugs can be corroded, if it hasn’t been hacked like mine was it should have a plug behind the bumper area, you can possibly need a new harness, which will come with a plug and then you will wire it to headlights, if unplug that plug see if you are getting power there. I’ve had my headlights do whacky things.
     
  4. Klleetrucking

    Klleetrucking Medium Load Member

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    Dec 11, 2010
    S.C.
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    Just a long shot but,, my '03 lost the low beam side one time. Traced it to the dimmer switch in the turn signal, broken wire. Good Luck and please tell us what you get figured out.
     
  5. 201

    201 Road Train Member

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    Apr 16, 2014
    high plains colorado
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    Check your wires where the hood tilts. Both my Petes and my WS had that problem.
     
    Bean Jr. Thanks this.
  6. NightWind

    NightWind Road Train Member

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    Nov 11, 2006
    Sunny South, AL
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    I'd also check the wiring inside the headlight box where the wiring comes into the headlight assembly through the hood and from the hood section of the wiring harness.
     
  7. Bernard D

    Bernard D Heavy Haul Member

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    Jun 27, 2020
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    I have 03 pete 379 had the same problen in NDokota due to deicers and chems on roads.
    it rotted my wireing AT the Right rear tail light ,the bulb was rotted i replaced bulp and harnes and head lights started working.( i know what !!!) bit thats what the mechanic did.
    check out the rear lights for rotted ends .
    good luck .
     
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