low/no charging

I'm about done, here

I've tried to help you, and you seem to not have read one word

That appears to be an aftermarket "powermaster" which means it is NOT using a factory regulator

You can not tell what is wrong by looking. You have to actually run some tests

That is a later squareback design, it is "isolated field," INCORRECTLY called "dual field" by many.

Do NOT attempt to re-assemble that thing without removing the "side" brush, or both of them

Remove all the regulator crap on the rear. Ground one field connection. Hook a clip lead to the other field connection, and clip the other end to the starter relay battery stud...... and see if it charges

This is going to be your choice. You can either sit up and pay attention...........

or you can go find a service manual and dig into that and learn on your own.

or you can just take the car to a mechanic and get out your check book.