Alternator Sizing - Amp requirements

Thanks guys. I appreciate the input.

After summing the potential loads, I know a 120 amp alternator will do the job just fine, even at idle. Heck, the fan I'll be using came originally in a car with a 130 amp alternator, but had a TON more electronics than what I'll be running. I'll probably just go with the JD unit since it's designed for 120 amps, though the rewired 90 amp unit would be a better fit.

I actually just heard from the alternator shop who would rework that smaller 90 amp alternator. They said that rewired 90 amp unit would likely end up at around 145 amp max. I'm just not sure I like the idea of a re-worked alternator putting out >60% more amperage than what it was designed for. Seems like a failure waiting to happen - albeit from a complete electronics novice's perspective. Either way, it doesn't sound like a good idea.