Or maybe just carry a spare alt.? Maybe easier to just swap it. (I'm not familiar with the brush replacement procedure.)
I'm guessing the belt(s) is (are) in good order?
Yep brand new belts. Swapping brushes on these old mopar units is pretty easy. It's not much harder than swapping brushes in a dremel tool. Just a couple screws and they pop right out. I could do it in five minutes.
