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No head lights , high voltage meter

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Rmj1980s, May 8, 2019.

  1. May 8, 2019 #1
    Rmj1980s

    Rmj1980s Bobtail Member

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    New to the forum. Can I get some input?
    My headlights go out with at the same as my speedometer as I’m driving. I take the shifter out of gear and they come on for a while and go out again. My voltage meter is high @18 volts. It goes down once I take out the shifter from gear any ideas where to start? Much appreciated.
     
    Rmj1980s, May 8, 2019
    Rmj1980s, May 8, 2019
    #1
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  3. May 8, 2019 #2
    Intothesunset

    Intothesunset Road Train Member

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    Tap on the alternator with a hard object like a hammer.
    Your alternator have dust buildup.

    Or your alternator may be on way out.
    Such as voltage regulator, or diodes, or brushes?
     
    Intothesunset, May 8, 2019
    Intothesunset, May 8, 2019
    #2
  4. May 8, 2019 #3
    pushbroom

    pushbroom Road Train Member

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    High voltage also kills the cab computer which is why dash dies.
    Fix the high voltage and everything else will also be fixed.
    Probably a bad alternator
     
    pushbroom, May 8, 2019
    pushbroom, May 8, 2019
    #3
    Goodysnap and spsauerland Thank this.
  5. May 8, 2019 #4
    Goodysnap

    Goodysnap Road Train Member

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    See above^^^^^^^^

    If Paccar, the CECU is seeing the high voltage and shutting down to protect other components from damage.
     
    Goodysnap, May 8, 2019
    Goodysnap, May 8, 2019
    #4
    pushbroom Thanks this.
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