Okay, how many volts is it producing? As far as the alt, the voltage regulator is internal and not serviceable. The regulator controls the field current of the rotor to limit system voltage. Overcharging, then, is caused by a faulty regulator. However, I need you to do a simple check.
With the engine off, open the hood and check the battery voltage. It should be slightly over 12v. Have a helper start the engine and recheck the battery voltage. It should be in the area of 14v.
Let me know what you find.
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Monday, July 21st, 2014 AT 6:20 PM