Flicker flutter

Mattax said
Just rereading what you first posted to see what I may have missed or misread.

The ballast resistor is for the ignition. It lowers the voltage so the coil doesn't draw too much and also helps protect the distributor's points. For a points system it should be somehting like a 0.7 Ohm resistor and for a Chrysler electronic system it should be 0.5 Ohms.

There is connection to the voltage regulator at one of the ballast resistor terminals. That was just a convenient location for the factory to make a junction. The alternator and regulator do not use the ballast resistor.
View attachment 1715846081

Not sure but this is why I suggested observing alternator output voltage with rpm.
The ammeter will only indirectly a voltage regulation problem.

Thank you for all the time and effort you’re putting into this please know I am fully aware of all the components of the car and what they do and wiring issues are not a problem for me I am an HVAC controls tech I am very trained on circuits connections plugs resistance wiring well things of that nature I mention what I changed in the car as a reference because most people when you post will ask you what you’ve recently changed or not so after I purchased the car it did need an alternator and for good measure I put in a new standard automotive regulator. When I mentioned the new voltage regulator for 73 to 75 I may have made a mistake I have also purchased a solid state blue in color replacement voltage regulator which I have not tried yet. Since the fluttering is in tune with the engine almost as if every revolution causes a flutter on time with with the exhaust note of the engine I was thinking of some sort of interference from the ignition circuit to which naturally the ballast resistor is part of I did not mean to imply or point to any direction of problem to the ballast resistor only mentioned that it was changed along with a couple of the parts that needed to be changed at the time.