That's why its not producing power.
See
Identifying Chrysler Alternators (1960-1976)
Easy fix.
However
you must charge the battery with a charger now.
If the ammeter was connected you would see it indicate 30 or more amps with the engine running running at fast idle.
As this member found out the hard way
here, the wiring
will be damaged by the high current a nearly dead battery will draw.
He saw this on the ammeter but unfortunately did not recognize what it meant.
