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Undercharging a battery can cause premature failure of the battery, the same as overcharging will do. This is caused by the lead plates within the battery cells becoming solfated.

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13y ago

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Will your battery light come on if your Voltage regulation is bad?

If it is undercharging the battery yes, but if it is overcharging the battery no in most instances. If it fails completely the light will come on.


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I suggest you get a battery hydrometer and check it periodically until it is charged. Overcharging depletes water from the battery. Undercharging shortens the battery life.


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