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.
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