Was wondering if I could get an opinion from the collective minds of knowledge regarding a recent issue. I'm riding a 1987 K100RS with roughly 43,000+ miles on it. Started it up yesterday to go in to work and it stalled out on me while down shifting. Went to restart, it would just turn over. Push started it, got it back to the house and let it run for a few minutes and turned it off. Went to restart it and nothing but the starter turning over. Put the battery on the charger, went to work, 9 hours later returned home, it started right up. Let it run for a while and shut it down. Went to restart and...nothing but the starter. I'm thinking alternator...anyone ever experience this before and can weigh in?