Flicker flutter

Glenn’s HC said

I have a standard brand brand new voltage regulator in there now. I know it’s new and it doesn’t mean anything or because it’s new but it is performing the job of keeping the voltage at proper rates however I have a brand new regulator for a 73 to 75 which is solid state I’m going to try that next and see if it cleans up the signal

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Before swapping more parts.
With voltmeter attached to the alternator output stud and a ground, increase the rpm from slow idle to 1500 or 2000 rpm.

When I wrote clean the points, I was referring to a mechanical type regulator. 67Dart273 pointed out that mechanical regulator can cause some fluttering. My point was only that those can often be cleaned up. Just remove the cover and see what the condition is. If there is a new regulator on the car now it could be mechanical, or it could be transistorized inside.

As far as a regulator for 73-75, that doesn't sound right. The vast majority of these cars use a feed controlling regulator up through 1969 models. One connection to the power source, and aanother connection that is internally controlled connection feeding the alternator's rotor.
From 1970 to the end of the line, the vast majority of these cars used a regulator that controlled the ground connection. These regulators have a triangular plug connector with 2 terminals. One terminal senses voltage, the other connects to the alternator's rotor and controls connection to ground. This regulator can not be used with the earlier alternator.
Photos and more in Identifying Chrysler Alternators (1960-1976)