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Cadillac STS Forum - 2005 through 2012 Discussion, Normal Battery Voltage at different states in Past Cadillac Vehicle Discussion; pgw85706: What you're seeing for voltage readings is normal. When first started, the alternator is putting out a lot of ...
  1. #16
    AllWheelEric is offline Cadillac Owners Fanatic
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    Re: Normal Battery Voltage at different states

    pgw85706: What you're seeing for voltage readings is normal. When first started, the alternator is putting out a lot of amps at a high voltage by design. As the battery gets recharged, the amperage and voltage drops. In colder weather, it seems the voltage may hit 15 but tops out closer to 14 in hot weather. I suspect this is by design because a cold battery can absorb a charge faster.

    If you're due for a battery soon, you may as well replace it before throwing money at other diagnostics. Just a hunch, though, it seems like you've got an electric gremlin that intends to feed on money.

    Maybe someone whose battery has gone dead can tell us if the car explains that with a message or if you just get no starter action. I can't recall from the one time it happened to me what (if anything) was shown on the DIC.

  2. #17
    pgw85706 is offline Cadillac Owners Member
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    Re: Normal Battery Voltage at different states

    Quote Originally Posted by AllWheelEric View Post
    If you're due for a battery soon, you may as well replace it before throwing money at other diagnostics. Just a hunch, though, it seems like you've got an electric gremlin that intends to feed on money.

    Maybe someone whose battery has gone dead can tell us if the car explains that with a message or if you just get no starter action. I can't recall from the one time it happened to me what (if anything) was shown on the DIC.
    I am not convinced it is due for a battery based on the "good health" report from the AAP diagnostics. In the "won't crank" situation, I get no message on the DIC. Thanks for the reply.

  3. #18
    I_OWN_IT's Avatar
    I_OWN_IT is offline Cadillac Owners Member
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    Re: Normal Battery Voltage at different states

    I was having the same issue with mine. I had my headlights on for 5 mins and the battery would go dead, or if my dome lights was on just for a min. It actually made my car have long starts as well. It would turn over but would take a while to start. When it was running it sayed 13.4and would gradually get up to 14.2-14.4 volts. I went ahead and went with the Optima battery. Very good buy, those batteries are awsome! But insanely priced. U pay for what u get.

  4. #19
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Normal Battery Voltage at different states

    I recently spend an afternoon puttering around and cleaning the interior of my car. I know I wore the battery down. A jump from a booster pack was plenty to start it. Before that... not even a click when I hit the start button.

    I'm convinced my 1SG with every option except the block-heater (Koz has me beat!) checks the battery and if it's marginal --- it won't even try to start. Slow cranking and high current draw from a dying battery could make smoke leak out of those expensive computers. GM's designers know how hard it is to pack that smoke into those electronics!

  5. #20
    BJD210's Avatar
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    Re: Normal Battery Voltage at different states

    I refuse to pay $200 for a stock battery so I decided I was going to pick the battery I wanted and force it to fit. The battery tray is fairly easy to modify if you have a decent understanding and tools for light fabrication. It cost me just over $200 and a couple hours of work but it has twice the cranking amperage of a yellow top Optima.

    Bigger is always Better!


  6. #21
    HUGN*RDS's Avatar
    HUGN*RDS is offline Cadillac Owners Fanatic
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    Re: Normal Battery Voltage at different states

    Hey guys sorry to bring up an old thread but I had my battery replaced 3 weeks ago at the dealer under warranty (4 year old battery out of my 09) and everything has been fine. Today I was driving and I noticed the battery voltage was 12.8V and asometimes 12.9V but for the whole ride I was looking at it and it did not change. I remember looking at it the other day and it said 13.7V or something higher like that. 12.8V sound low to anybody else? I'll check it again later to see if it has changed.

    Thanks

  7. #22
    PontiacV8's Avatar
    PontiacV8 is offline Cadillac Owners Fanatic
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    Re: Normal Battery Voltage at different states

    ...dropping down to 12.8 or 12.9 volts is pretty normal...has something to do with the "Electrical Power Management (EPM)"...have a look here...:

    http://www.cadillacforums.com/forums...ml#post3244608

    ...and especially here... Post #6 :
    http://www.cadillacforums.com/forums...ng-13-0-a.html

  8. #23
    B1n2fra's Avatar
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    I thought it was a problem to at first but I realized that's just the way it is. anything under 12, then you should worry

  9. #24
    HUGN*RDS's Avatar
    HUGN*RDS is offline Cadillac Owners Fanatic
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    Re: Normal Battery Voltage at different states

    ^thanks a lot man, gues so!


    Quote Originally Posted by PontiacV8 View Post
    ...dropping down to 12.8 or 12.9 volts is pretty normal...has something to do with the "Electrical Power Management (EPM)"...have a look here...:

    http://www.cadillacforums.com/forums...ml#post3244608

    ...and especially here... Post #6 :
    http://www.cadillacforums.com/forums...ng-13-0-a.html
    wow that post #6 was something else. after researching further I looked at the current sensor and thought that we cool. it also would notify me which I figured all along. pretty cool I wish I had like a block diagram for all that stuff.

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