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579 foglamp fuse/relay

Discussion in 'Peterbilt Forum' started by jrtexgunner, Sep 30, 2019.

  1. Sep 30, 2019 #1
    jrtexgunner

    jrtexgunner Bobtail Member

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    Sep 1, 2013
    0
    Does anyone know the fuse or relay location for the foglamps on a 2014 Pete 579? I've looked through the fuse boxes under the dash and on the engine side firewall, but can't find anything that appears to be for the foglamps. Getting no power at the lamp connector, but the switch illuminates when turned on.
    Thanks,
    -JR
     
    jrtexgunner, Sep 30, 2019
    jrtexgunner, Sep 30, 2019
    #1
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  3. Oct 7, 2019 #2
    Goodysnap

    Goodysnap Road Train Member

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    Headlamps and Key must be on for foglamp power. If you still have issues I will trace the circuit for you.

    Labeled G7 under hood, Location G10 inside and K14 inside
     
    Last edited: Oct 7, 2019
    Goodysnap, Oct 7, 2019
    Goodysnap, Oct 7, 2019
    #2
    pushbroom and spsauerland Thank this.
  4. Oct 7, 2019 #3
    jrtexgunner

    jrtexgunner Bobtail Member

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    Sep 1, 2013
    0
    Thanks for the reply. Key on, lights on, lowbeam or high, still no power at the light. Switch lights up but that's it.
    If you can find a fuse or relay position I can check, that would be much appreciated.

    -JR
     
    jrtexgunner, Oct 7, 2019
    jrtexgunner, Oct 7, 2019
    #3
  5. Oct 7, 2019 #4
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    G7 Under hood @ firewall is chassis node power in. Also check fuses G10 and K14 these should be good since you switch lights.

    Chassis Node connector B under cab Pin 15 is power out direct to lights.

    Power in from fuse is same connector pin 18
     
    Goodysnap, Oct 7, 2019
    Goodysnap, Oct 7, 2019
    #4
    pushbroom and spsauerland Thank this.
  7. Oct 8, 2019 #5
    jrtexgunner

    jrtexgunner Bobtail Member

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    Sep 1, 2013
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    Well, thanks for that info. It is much appreciated. I looked around in there and reset the relay at G7, and then started getting power to what I finally was able to read as N3-fog driving/fog lamps. So now have 12v at that fuse and about 10 at each lamp plug, but no lights. So on to checking the actual lamps themselves.
     
    jrtexgunner, Oct 8, 2019
    jrtexgunner, Oct 8, 2019
    #5
  8. Mar 22, 2020 #7
    Cooper7623

    Cooper7623 Bobtail Member

    10
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    May 22, 2011
    Grand Rapids, MI
    0
    Did you get it figured out? I'm having the same issue with my 2016 579. Found the fuse, I cannot find a relay. Switch lights up, headlights are low, and the truck is running. Still no power at the light.
    I'm stumped.
     
    Cooper7623, Mar 22, 2020
    Cooper7623, Mar 22, 2020
    #7
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