I think it's fixed. I checked several connections, and since the alternator was out and was the original alternator, I replaced it with a 120 amp one anyway. (Jeep's gotta be reliable for my hunt in December
) Knowing my luck, I'd put it back in and it'd go bad within a month and I'd have to yank it off again. Which would make me really, really grumpy. I replaced the terminals on the battery cables as they looked kind of trashed. After consulting with the internet, I found some people who said that poor grounds and poor connections to the battery can cause the voltage regulator to go a little bit screwy when the battery starts to get low, and sometimes the voltage will get bumped up to 19v. I guess I'll know for sure in a few days if it's fixed.
I really want to punch the engineer who decided to put the alternator below the AC compressor and kick the engineer who set up the tensioner system for the serpentine belt. I can change the alternator on my dad's powerstroke in 15 minutes flat, but noooooo. When an engineer does a really good job, you don't even know that they exist. When they make maintenance a PITA, you want to go to their house with a mob that is wielding torches and pitchforks.