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Alternator charge time on Cummins X15

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by TruckerOnDuty13, Feb 9, 2024.

  1. Feb 9, 2024 #1
    TruckerOnDuty13

    TruckerOnDuty13 Bobtail Member

    33
    8
    May 27, 2023
    0
    Hi

    on Cummins x15, Just curious how long will an alternator take to charge 4 cat batteries from absolutely low voltage. I jumped it once and ran truck, idle 15mins and highway 25mins. Dash showed 13.1v with lights off. However, 15 mins later auto kill switch kicked in meaning the charge dropped. Batteries and alternator was replaced 4months ago. Any feedback or do i need to run the truck longer? I hear some people say 30mins enough and some online say upto 24 hours. Not sure and confused.
     
    TruckerOnDuty13, Feb 9, 2024
    TruckerOnDuty13, Feb 9, 2024
    #1
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  3. Feb 9, 2024 #2
    JB7

    JB7 Heavy Load Member

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    Dec 13, 2022
    Laurel, MD
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    Your 40 minutes of idle and drive will just give a surface charge. You may have excessive draw on the batteries. Have to wonder, how did the batteries get so low that you had to jump it if you have a kill switch? Best thing to do would be to slow/trickle charge the batteries individually. Best to charge even a new battery before installation. I have seen new batteries with a date sticker of only 1 month old take 4 - 8 hours to charge right off the shelf. And yes, there is a lot of conflicting information on the net.
     
    JB7, Feb 9, 2024
    JB7, Feb 9, 2024
    #2
  4. Feb 10, 2024 #3
    TruckerOnDuty13

    TruckerOnDuty13 Bobtail Member

    33
    8
    May 27, 2023
    0
    It
    it was in the shop for a long time and mechanic left something running which i guess auto kill switch didnt do the job. Sat for a bit so what do you suggest? Runn it for a few hours and see if it hits 14v? Or get the battery changed, they had 3 year warranty
     
    TruckerOnDuty13, Feb 10, 2024
    TruckerOnDuty13, Feb 10, 2024
    #3
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