1969 SS 395 350hp. I've had the car about 6 months. The voltage seems to flucuate and not hold at 13-14 volts. Lights are dim and voltage around 10 when at idle. I replaced the battery, but still seems to do the same. It looks like the previous owner put on a new alternator and voltage regulator. Could one of them be defective or not enough amps on the alternator? Other hints? I don't have alot of "stuff" pulling amps....no extras.