Re: Why do car batteries not overcharge??
Yes, there is a "charge controller" on car alternators.
In the olden days, it was a separate voltage regulator box, now it's usually built into the alternator. The purpose of the regulator is to increase or decrease the electricity sent to the field windings of the generator, thus increasing or decreasing the power output. It does this by monitoring battery voltage.
Good little tutorial on alternators: http://www.autoshop101.com/trainmodu...or/alt101.html
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