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WTF? 2015 579 wiring issues

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by FdEF, Sep 6, 2018.

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  1. Sep 6, 2018 #1
    FdEF

    FdEF Light Load Member

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    Dec 5, 2017
    Ogden, Ut
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    Key off and all switches off, green and yellow wires in the pigtail to the trailer are solid hot. Key on turn signals on, tractor signals are working perfect but still sending hot to the trailer through the green and yellow. Is this a chassis node issue?
     
    FdEF, Sep 6, 2018
    FdEF, Sep 6, 2018
    #1
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  3. Sep 6, 2018 #2
    Oldironfan

    Oldironfan Road Train Member

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    Need a new phillips socket .
     
    Oldironfan, Sep 6, 2018
    Oldironfan, Sep 6, 2018
    #2
    FdEF Thanks this.
  4. Sep 6, 2018 #3
    FdEF

    FdEF Light Load Member

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    Dec 5, 2017
    Ogden, Ut
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    Is this a common thing? I followed that phillips plug to a socket. do they go bad like that?
     
    FdEF, Sep 6, 2018
    FdEF, Sep 6, 2018
    #3
  5. Sep 6, 2018 #4
    Oldironfan

    Oldironfan Road Train Member

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    They corrode, or crack. They cause hell when bad.
     
    Oldironfan, Sep 6, 2018
    Oldironfan, Sep 6, 2018
    #4
  7. Sep 6, 2018 #5
    FdEF

    FdEF Light Load Member

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    Dec 5, 2017
    Ogden, Ut
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    Well it's not the chassis node or the phillips plug. Other than lighting this b#@!tch on fire i'm lost
     
    FdEF, Sep 6, 2018
    FdEF, Sep 6, 2018
    #5
  8. Sep 6, 2018 #6
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    So left and right turn on trailer are on solid?
     
    spsauerland, Sep 6, 2018
    spsauerland, Sep 6, 2018
    #6
    SAR and FdEF Thank this.
  9. Sep 6, 2018 #7
    FdEF

    FdEF Light Load Member

    70
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    Dec 5, 2017
    Ogden, Ut
    0
    Yes both. I've checked back into the wiring before the actual plug for the trailer as far as i can and its always the same result. I'm baffled. I deal with a lot of weird wiring stuff but this is really strange
     
    FdEF, Sep 6, 2018
    FdEF, Sep 6, 2018
    #7
  10. Sep 6, 2018 #8
    Justrucking2

    Justrucking2 Road Train Member

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    Plymouth MI
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    My last Pete had a grounding strap on the fifth wheel to the frame, check that and see if there is one there, and if it is, check to see if it is broken or frayed.
     
    Justrucking2, Sep 6, 2018
    Justrucking2, Sep 6, 2018
    #8
    FdEF Thanks this.
  11. Sep 6, 2018 #9
    Goodysnap

    Goodysnap Road Train Member

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    L Trailer turn is connector B pin 16
    R Trailer turn is connector C pin 20

    Dont see to many bad chassis nodes internally. Pretty sure your inputs are good since all your truck lighting is good. These go straight from the node to the 7 way. My money is on a short to power somewhere. Is your center pin hot? Do you have any continuity between the L or R pins and center when disconnected?
     
    Goodysnap, Sep 6, 2018
    Goodysnap, Sep 6, 2018
    #9
    spsauerland Thanks this.
  12. Sep 7, 2018 #10
    FdEF

    FdEF Light Load Member

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    Dec 5, 2017
    Ogden, Ut
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    Turns out if you use snap ons wireless tester, its so sensitive that it will pick up even 1 volt which the truck generally sends 3-4 volts out the turn signal pins all the time. As i was testing it it was showing hot, even though it was barely anything. #### snap on overachievers!
     
    FdEF, Sep 7, 2018
    FdEF, Sep 7, 2018
    #10
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