Worn out brushes in an alternator. A $15 part, and a 45 minute service - in the comfort of your garage - can mean the difference between completing a trip and being completely stranded.
TL;DR - the alternator failed as I was about 90 minutes from home, and it was because the brushes had worn out. Luckily, I was carrying a spare set and swapped them in about an hour, completely fixing the issue.
Unlike many of the topics in a rig review, where I go into a little detail in the original post, but most of it in the review, I covered the alternator failure pretty well when I told the story. In the end, I'm not really all that surprised that the brushes wore out - they'd been rubbing in there for more than 200K miles - but it's a good reminder that wear parts need to be replaced on a regular basis so you aren't left stranded by something that would have been easy to fix back home.
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