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You need a voltmeter. A fully charged battery is 12.6 volts. With the engine running the voltage on the battery supplied by the alternator should be 13 to 14 volts. A few auto parts stores will do the check for you if the battery has enough charge to get you there.

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16y ago
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Q: 1993 Oldsmobile cutlas cierra checking charging system for alternator?
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