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Western star

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Kenny graves, Jul 23, 2018.

  1. Jul 23, 2018 #1
    Kenny graves

    Kenny graves Bobtail Member

    1
    0
    Jul 23, 2018
    0
    I have a 2006 star 4900. The charging system charges to 13.1. Afterwards it goes all the way to the 11 mark before coming on , but it seems to be tri kal charging, also when I run the apu it went to 14.3 one night and 12.3 the next 2 , batteries were all tested as good , any thoughts ?
     
    Kenny graves, Jul 23, 2018
    Kenny graves, Jul 23, 2018
    #1
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  3. Jul 23, 2018 #2
    AModelCat

    AModelCat Road Train Member

    27,731
    145,324
    Jul 7, 2015
    Canuckistan
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    Could be any number of things. Failing alternator/voltage regulator, faulty voltmeter gauge, wiring issue to voltmeter gauge, poor connections on the alternator circuit.
     
    AModelCat, Jul 23, 2018
    AModelCat, Jul 23, 2018
    #2
  4. Mar 5, 2020 #3
    trojanhorse

    trojanhorse Bobtail Member

    9
    0
    Apr 14, 2015
    0
    I had the same problem. I cleaned up all connections at the batteries, the grounds on cab and frame, and most important the connections on the firewall under the plastic cover where there a two 100 amp solid fuses
     
    trojanhorse, Mar 5, 2020
    trojanhorse, Mar 5, 2020
    #3
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