Alternator Amp Size?

And the rub with the Packard terminals is that they are rated for 20 amps IIRC. .

I've "said" that LOL. One of my favorite examples is "back when" I was an HVAC serviceman, around here "if" you have a heat pump it is almost always paired with an electric furnace. We've had lots of problem with the same design flag terminals, which have nominally about 25A through them on each furnace element (5kw give or take at 220-240V) and there are almost always several of them per element----------From the breaker to a protection device, to and through the element, to and through the sequencer and then back to the breaker. So that is 6 flag terminals per element and up in this country there is usually about 4 or 5 elements per furnace if not more (5 elements X 5000W X 3.4BTU is 85000 BTU)

Actually I LIKE ammeters, but you can design them with remote shunts and keep them "safe." But the manufacturers, NEVER used decent remote shunts. All three "big ones" used the wiring harness itself for the remote shunt, which resulted in a "numb" ammeter. On my old 86 Ford Ranger, you had to STARE at the ammeter closely and turn on the headlights do 'decide' if "I guess it moved."