1966 dart factory charging system up grade ?
My ammeter failed a few months after installing a 60A alternator leaving me stranded 30 miles from home, the quick fix was to move one wire to the other post on the ammeter thus completing the circuit and I was up and running in ten minutes .
When installing a higher amperage alternator do that and run a 10 gauge wire from the alternator to the starter or battery and install a volt meter.