Alternator HOT

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I replaced my external voltage regulator cause it went out. And replaced the alternator -while I was there. Same alternator, plugged right up. Things are going fine.
I reach into the engine bay today and its warm it not hot to the touch.
What is going on?
I already know I need to change this rats nest of a wiring harness I have.
I'm trying to get my engine timed correctly so that I can ask other questions of power loss.
These two things might be related. I am at my breaking point.
As much as I despise car dealers I dislike mechanics even worse.
Besides the crazy amount of money they want.
But it just seems like every thing I fix, two things break.
I have always wanted one of these trucks, but now that I am older, they are older too.
Gripe grumble complain. And so on.