Alright, I've got an update. I'm at my dad's place right now, and he and I just looked over it for a quick 5 minutes. We're gonna get more in-depth tomorrow about it, but I had him feel around the engine when I shut the car off, and he said he didn't feel any vibrations coming from the alternator after the car was shut off, so we're not thinking anything is spinning in there. If I don't have to replace that, I'm happy.I realize it was a pretty simple process, but I can't exactly shut the car off and look under the hood at the same time. Anyway, I'll put a video up tomorrow of the sound again, hopefully you guys will be able to hear it better this time.