66 barracuda ignition problem

I agree, typical problems and not just Mopars. Better to bypass the ammeter within the engine bay, otherwise you can still melt the bulkhead connector. I rewired the whole underhood in my two A's, using a relay box from a Jeep. However, that is a lot of work and I may never do that in my C body. Modern cars can be worse, with miles of wiring. I have had to repair the underhood harness in my 2002 T&C twice, mostly from heat around the exhaust x-over pipe. To not get stranded, look at Battery Brain, which I have in most my cars now and have saved me several times.