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It is normal for the gauge to increase slowly when you first start the vehicle. This is because the voltage regulator is compensating for the power that has been drained from the battery during starting the vehicle. The voltage should stop around 15 volts though, if it continues above 16 volts you could have a bad regulator. Voltage above 16 volts can damage your battery and other electrical equipment in your vehicle.

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Q: What causes your voltage needle to rise slowly?
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