Except when the ammeter shorts to the instrument cluster and the other nonsense that happens with a 40yo car.
Stupid charge path for the alternator and has been since the cars where rolled off the assembly line.
Sorry, didn't understand what you said, but if is what I think, the "problem" with the ammeters is more than the ammeter itself. Is the lack of power from stock alts.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela