not charging

How is it going? I have a 1966 Mustang and its been running fine until today? Its electrical issues. I've replaced the starter solenoid, alternator, and voltage regulator. I had the same issue about a year ago but I just had to get the voltage regulator replaced and I also replaced the starter...

when the car is off, i get 12plus volts at the battery,i took the altenator to the autoparts store,they test,said it was good. i bought and replaced the voltage regualator. before i replaced it, when the car was runing,there was now flucuation in volts. now with the new one there is a...