Last week the battery light started coming on under acceleration. Weird as I thought that more rpms meant more power being generated by the alternator. A guy at work and I did a little shade tree analysis and determined that the battery was a bit low and that the alternator wasn't charging like it should. I consulted with ChrisFix and others and did some more testing at home. Then the battery light stayed on. Battery was putting out 12.1 static then when running, it went down to 11.6. Didn't change much under load but either way, that seems fairly telling. But, since I'm not particularly mechanical, I pulled the alternator and took it in to have it tested. Failed 4 times in a row.
Alternators are freakin expensive!! They want like ~400 bucks for a remanufactured one. I never even got a quote for a new one. I'll just assume that if I took it to Subaru, it would have been a 1500 dollar quote so I didn't bother. Kim was able to find one online for under 200 bucks with a 2 year warranty through Advanced Auto and some coupon code. Now that I've pulled it, I'm not so afeared of having to do it again in the future. The only issue that has my attention is the bolt that was holding that pulley on there. It never loosened up from the first turn to the last. Hope I can get it back in there. Anyway, we ordered it yesterday and got an email this AM that it's shipped already. That's good.
Also took the battery into Costco to see if they could test it or charge it or anything other than stare at it like I was doing. Purchased in '19 and had a 3 year warranty. Costco doesn't check batteries so they swapped it out for a brand new one. Price hadn't even changed. So, hopefully in a couple days, I'll be back up and running again so the next big thing can go wrong.

Sidebar: While we were snorking around under the hood the first time, the guy at work noticed that the main ground was just hanging there.

So we found where it is supposed to go and with much gnashing of teeth and some bloody paws, we got it hooked back up. I wonder if that was the cause of this whole thing but I'm not smart enough to know one way or the other.
Go Subaru.