Need help with electrical problem

71 cuda all new wiring from Year One the car was restored in 2004.
I think it is the voltage regulator but not sure I replaced the regulator and it work for a couple of week. 15 miles.
The car started and ran with the new regulator.
the voltmeter in the car worked fine until I ran the car hard. Maybe reved the motor to 6000 rpm.
The voltmeter showed over charging then after a while it droped to the center. Not charging or discharging.
When I shut the car off it was dead. This is the same thing that happend with the original Voltage regulator.
The battery has a full charge but the car doesn't have any power going to it.
Not even the clock will run.
Then If I un hook the battery or the voltage regulator and reconnect it everything will work.
What is going on here? I didn't know that a voltage regulator could stop all power from leaving the battery.

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I didn't know that a voltage regulator could stop all power from leaving the battery.

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It cannot. Start with seperating the bulkhead & see if the fusible link is loose. You want to check each connection/terminal from the batt positive post in to the ign switch to find the loose/open connection