Overcharging the alternator can cause a series of electrical failures, which is more common than undercharging. Having the alternator repaired or replaced is the only way to get rid of alternator overcharging.
What causes an alternator to put out High Voltage?
It is most likely that your alternator is overcharging your battery or that the battery is defective. A faulty voltage regulator or an issue with the wiring of the charging system are two other possibilities for failure.
What happens if an alternator is overcharging?
Your battery will swell if your alternator is overcharging and causing an accumulation of hydrogen gas. Liquid electrolyte leaks from the battery, which is extremely hazardous. If you notice this, you should consult a medical professional as soon as possible.
How many volts is too high for an alternator?
As low as 13 volts can be normal for some alternators. Constant 13.6 volts may indicate a problem for some people. Others are used to seeing as much as 16 volts for extended periods of time. There is nothing abnormal about other people seeing the alternator not charge at all on occasion.