76 Plymouth Valiant won't start

I overstepped........disregard worrying about the ammeter. I had forgotten the 76 is an "external shunt" ammeter. That lets that "out."

Might be well to step back and take a fresh start

You don't seem to see any smoking or heating now?

So where are we?

Does the starter crank the engine? If not let's attack that

If it does, have you checked for spark, what is the result?