Low charge to no charge issue pulling hair out

Was pointing to #1
That's between 10 and 20 amps, my 67 will go there for a few minutes after a hard start. But it will settle down once the battery is happy.


My battery is 7 years old, garaged in northern Colorado, 1000 to 2000 miles per year.

I do think you have an issue either with the wires and connectors between the alternator post and or the battery.