2006 Pete overcharging

Discussion in 'Trucks [ Eighteen Wheelers ]' started by carp, Sep 16, 2011.

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  1. Sep 17, 2011 #21
    carp

    carp Bobtail Member

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    Sep 16, 2011
    Pittsburgh, Pa
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    Voltage at the batteries was and is 14.23. I have been using the original alt pulley (moving it from one alt to the next). The truck did not have a sense wire....I added one from (batt +) post to sense terminal on alt. ONE WEIRD THING DID HAPPEN.....while checking voltage at alt my allegator clip grounded out the main batt + terminal for a few seconds.....some sparks....then perfect voltage!....right at 14.1 on the guage! The truck went to work the next day....right back to near 15 & overcharging....the brief short didnt hurt the alt but made it behave properly for a little while.......WEIRD!
     
    carp, Sep 17, 2011
    carp, Sep 17, 2011
    #21
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  3. Sep 17, 2011 #22
    carp

    carp Bobtail Member

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    Sep 16, 2011
    Pittsburgh, Pa
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    Dash / Body computer......sounds complicated and expensive....explain
     
    carp, Sep 17, 2011
    carp, Sep 17, 2011
    #22
  4. Sep 17, 2011 #23
    carp

    carp Bobtail Member

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    Sep 16, 2011
    Pittsburgh, Pa
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    Heavyd......the original alt was tested and confirmed bad diodes & stator
     
    carp, Sep 17, 2011
    carp, Sep 17, 2011
    #23
  5. Sep 17, 2011 #24
    Heavyd

    Heavyd Road Train Member

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    The newer trucks are mostly computer controlled and most gauges are driven by computer data. This is neat problem you have. Do you have a generator or inverter or any other extra stuff mounted anywhere. You could try pulling fuses one by one and seeing if the voltage returns to normal to test if something in the truck wiring is going bad.
     
    Heavyd, Sep 17, 2011
    Heavyd, Sep 17, 2011
    #24
  7. Sep 17, 2011 #25
    Heavyd

    Heavyd Road Train Member

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    That isn't a 24 volt alternator by mistake is it? You can also disconnect the alternator positive cable and see if the voltage comes down to make sure something hidden isn't producing voltage.
     
    Heavyd, Sep 17, 2011
    Heavyd, Sep 17, 2011
    #25
  8. Sep 18, 2011 #26
    carp

    carp Bobtail Member

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    Sep 16, 2011
    Pittsburgh, Pa
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    Nothing extra installed on the truck & its a 12v for sure.
     
    carp, Sep 18, 2011
    carp, Sep 18, 2011
    #26
  9. Sep 19, 2011 #27
    Heavyd

    Heavyd Road Train Member

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    Not to be rude, or insulting, but just double check that all the batteries are connected properly, all the positives are together and all the negatives are together. Make sure all your grounds and positive connections are clean and tight. Bad connections will increase the resistance between the alt and batteries. With higher resistance comes higher voltage. Most alternator cables connect to the battery cables at the starter. make sure everything is clean and tight there. Make sure the ground cable is good too and the engine block is properly grounded. Have you tried pulling the fuses or breakers one by one to see if a certain circuit is causing this?
     
    Heavyd, Sep 19, 2011
    Heavyd, Sep 19, 2011
    #27
  10. Sep 20, 2011 #28
    carp

    carp Bobtail Member

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    Sep 16, 2011
    Pittsburgh, Pa
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    Haven't pulled any fuses.....4 new batteries & all cables were cleaned and tightened. Engine & frame ground were removed & cleaned. Didnt check any alt cables at the starter.
     
    carp, Sep 20, 2011
    carp, Sep 20, 2011
    #28
  11. Sep 25, 2011 #29
    carp

    carp Bobtail Member

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    Sep 16, 2011
    Pittsburgh, Pa
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    Still overcharging. It was fine....right at 14.2 then it decided to climb to 15....even with all lights on, a/c on, everything turned on....still overcharging & turning the light on in the volt guage. Do I have a dash circuit board problem?
     
    carp, Sep 25, 2011
    carp, Sep 25, 2011
    #29
  12. Sep 25, 2011 #30
    Hanadarko

    Hanadarko Independent Owner/Operator

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    Some thoughts here, but no ideas on your problem:

    My 36SI with sense lead connected runs around 14.5 give or take.
    The sense lead does NOT have to be hooked up. That is optional. It is supposed
    to help the alternator by reading directly on the battery but is not mandatory.

    Personally I dont think there is anything wrong with a reading in the 14v entire range.
    I have brand new Thermoking EON AGM batteries and my 36SI is only 1yr old and I typically see around 14.2 when it's running.

    Alternator is: 13.65 to 15.0 volts
    Readings at 15+ are indeed too high.
     
    Hanadarko, Sep 25, 2011
    Hanadarko, Sep 25, 2011
    #30
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