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Thread: Car Battery voltage reading 11.8 when off is this bad?

  1. #1
    MattM23 is offline Cadillac Owners Member
    Automobile(s): 2009 CTS 3.6 DI
    Join Date
    May 2013
    Age
    31
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    Car Battery voltage reading 11.8 when off is this bad?

    Yea I go out and check my battery voltage on the DIC and it is reading 11.8 after car been sitting for a day and is off is that bad? do I need to get a new battery?

    Thanks

    ----------

    also when im checking this on the DIC the radio is on and inside lights and outside lights are on also


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  3. #2
    wmillar is offline Cadillac Owners Fanatic
    Automobile(s): 2008 CTS DI F3 Sport Suspension
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    Aug 2003
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    North Texas
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    11.8 is what my battery was last month before I bought a new one, because if I would listen to the radio for just a few minutes the car wouldn't start. I replaced it with a new battery, checked it tonight and it was 12.6, and it has been sitting for 4 ,hours.

    The replacement battety for an AC Delco is 48PG it has 770 CCA.

  4. #3
    jeffc83's Avatar
    jeffc83 is offline Cadillac Owners Connoisseur
    Automobile(s): 2008 CTS4 DI Premium (SOLD) / 2013 XTS Luxury (TOTALLED) / 2015 BMW 328i XDrive Lux
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    FWIW, I purchased a battery from BJ's two weeks ago and am happy with it. (I can now keep the radio on for the full ten minutes of accessory power...ah, the small joys in life) Easy install and only cost me just over a hundred bucks...personally, I'm not keeping my CTS for more than another year so cheap was the best way to go.

    I just noticed you have a 2009...seems a little early but the voltage is a good early warning sign.

  5. #4
    Tbbt is online now Cadillac Owners Connoisseur
    Automobile(s): 2010 CTS4 Premium Wagon-Diamond White-Cashmere Interior
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    Re: Car Battery voltage reading 11.8 when off is this bad?

    MattM23,

    Look up a thread called 'Battery Challenge' in General Discussions and read my post #12. Low Voltage could be the battery or even your alternator or fan belt. If you have questions, post them and I'll respond.

    Marv


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