ammeter blowing fuses/ getting hot

My "goto default" argument against Mopar bulkhead connector terminals used to be electric furnaces. "In a previous life" I serviced HVAC/R and lots of heat pumps and or electric furnaces. They use those 1/4" spade/ flag terminals at the heating elements/ protectors/ relays in the controls. The typical 240V electric strip is nominally 20-25 amps so that is what is on those and THEY USED TO FAIL FAIRLY REGULARLY so if they are failing at only 20-25A you can imagine how under-designed they are at say, a 55A alternator

Here's an example of an old school electric strip unit from "back in the day ish"

controls2cs'.jpeg

controlscs.jpeg