What causes an alternator to overcharge

From AnswerCop

[edit] What causes an alternator to overcharge?

[edit] Answer

Probably the wrong voltage regulator - for each vehicle. The controller has no control of the alternator field current to the charging voltage of 14.5 V, to a lesser or greater extent and may have up to 16 volts. More than 16 V are hazardous to the electrical system (viz boil dry firing battery or other items). (A fully charged battery of 12 V should show 12.6 V in the resting state, the charging voltage is higher than the engine in order to push the electrons back to the battery from it.)

Unfortunately, voltage regulators are almost never the owners to repair (epoxy-encapsulated printed circuit board hidden mystery without any changes!) Except replace a new one. The only good news is that they sell for about $ 10, compared to the alternator for about 200 dollars!

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