Overcharging

Well the '73 FSM shows the power to the inition switch as red.
upload_2019-10-2_20-41-50.png
Be real careful moving wires around under there with the battery hooked up.
Everything connected to the main splice is hot - all the time.
Accidently ground any of them and BIG sparky. If they touch good, the fusible link will go poof!

It's been years since I've had a column ignition switch car, but some guys here with early 70s cars have posted about finding bad connections there.
If you need to replace a terminal connector in that one (or the bulkhead) search for a thread I started on Chrysler connectors and terminals. That should help.