I cooked a battery last week. Bought the car not to long ago and figured it was a bad battery (65 chevelle). Well, my new battery is venting and leaking from the vent holes. It measures 12 volts when car isn't running. I check the voltage from the bat. terminal at the alternator when idling and it reads 16V. I checked the voltage from the battery when the car is running and it reads 16V. I don't see a regulator that connects to the alternator anywhere. There is a threaded ground post in the back of the alternator and nothing is connected to that. I use it for the ground when I tested the voltage. Am I overcharging my battery? Do I need a new alternator?