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by geopop on November 26th, 2006

geopop

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What should battery voltage read when turning over a car (starting)?

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Answers. 4 helpful answers below.

  • by Anonymous on November 26th, 2006

    Anonymous

      A fully-charged car battery, in good condition, with no load on it, will measure about 13.2 volts.  With the engine running, if the alternator and voltage regulator are working correctly, you should measure about 14 to 15 volts at the battery.  What you get when the starter is being cranked could vary greatly depending on the size of the engine, the conditions under which it is being cranked, the condition of the battery, and how much of a load the battery is designed to handle.

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  • by Ho--Jo on June 11th, 2007

    Ho--Jo

    Please review the following video.

    http://www.mpsaz.org/c3rmhs/hljohnso/chkalternator.htm

    >12.6 for the battery
    13.5-14.5 for the alternator

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  • by karniki1 on November 26th, 2006

    karniki1

    A well charged battery usually reads about 12.7 volts. If we measure the volts while the car is being started, it measures about 8.2 to 10.6 volts.

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  • by Anonymous on May 26th, 2007

    Anonymous

    My answer to this question would be around twelve volts because the starter is designed to operate at twelve volts. If the system voltage drops to much below the desired voltage the starter will not roll the engine over and could actually be damaged if pushed to do a job which it is not designed to do. I agree with voltages varying greatly however, I would say in most cases around twelve volts +/- a volt. If values drop to far I would say the battery is either to small for the job or no longer has the required capacity it once had.

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