I thought I would pass along some info I learned on another forum concerning overcharging external regulators. For those of you who know Ignitionman(Dave Ray), he posted some suggestions on this subject.
Make sure the external regulator is grounded to the engine, through the stock paths, but grounded correctly.
Obtain the Wells VR715 replacement external regulator at Autozone or other parts store, cost about $12 or so. This regulator directly interchanges with the stock Delco and the Delco cap can be used on it.
The stock Delco regulator is a servo type, has solenoids to turn the rotor on and off, and needs adjustment to set the in-out and charge rates. This type turns the rotor on and off as the system needs volts, it also makes for high/low/high/low light operation when the headlights are on.
The Wells is electornic and works like the later internal regulator alternator types. It turns the rotor on and keeps it engaged until the key is turned off, so the charging is always held on with no interruptions. When the voltage rate of 14.6 is reached, excess charge voltage is dumped to ground. This type is more stabile and accurate and makes for less alternator wear.