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It's probably the Voltage regulator inside the Alternator.

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โˆ™ 2004-08-29 04:56:48
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Q: Why would the voltmeter on a '99 Chevy S10 drop to 11.5 volts while driving?
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Why would the battery gauge drop while car is running?

If it is your voltmeter that drops while the vehicle is running. Most likely the alternator isn't putting out enough volts.

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