An alternator is controlled by a voltage regulator. The regulator can be part of the alt., the computer, or a stand alone unit. The regulator controls the amount of current in the field windings which then controls the voltage output.
An alternator is regulated to prevent overcharging of the vehicle's battery.
Yes if the alternator is overcharging the battery.
Defective voltage regulator.
Voltage regulator is more than likely defective. The Regulator is built into the alternator so you will have to replace the entire alternator. Just make sure it is really overcharging. You should read from 13.5 to around 15.5 volts with a digital DC voltmeter if the alternator is performing as it should. Must more than 15.5 volts and it is overcharging.
Voltage regulator in the alternator is malfunctioning
The alternator is overcharging due to the regulator malfunctioning. Replace the alternator.
It usually means that the battery is going bad, and the alternator is overcharging to compansate.
Failed battery, or alternator is overcharging.
Overcharging by the alternator or if it is connected in reverse polarity.
Defective voltage regulator. Some are built into the alternator and some are external.
Overcharging. Check your electrical system to see if the alternator is overcharging the battery. It can also be the battery is defective and needs replacing.
It's possible that your alternator is overcharging your battery.