1964 Plymouth Barracuda Build CAUTION Resto Mod

I noticed you said you grounded out your 2nd field wire...I was pretty sure the pre-70 cars only had a single field wire, and if you grounded it, you'll push full charge out of the alternator...probably over 15V...good way to torch stuff...or you could've just had too much current running through the ignition wiring. Either way, it's a known issue with these cars to have electrical problems.

Recommend you modify your charge wire with at least an 8ga directly from the alternator charge post to the battery terminal on the starter relay and bypass your ammeter.