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Automotive Battery VoltagesAssuming your voltage meter is accurate, the battery is fully charged, when the key is turned on, without the engine running, and no accessories turned on, the meter indicated voltage should be 12 volts.

When the engine is running and the alternator is charging the battery, the voltage should indicate anywhere between 13 volts to about 14.6 volts.

Answer 2 - A wider Acceptable Range

13.5 −16 volts is acceptable with the engine running.

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Q: With the key turned on how many volts should your car battery be at?
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