I had an 85 Accord that used to eat alternators. When it ate the first one, I didn't have the money to buy a rebuilt one, so I bought a used one from the junkyard. Worked fine for a couple months, then bearings went out of it. So, I took it to a local auto electrical shop and they rebuilt it for me. ~$75. Lasted like 4 or 5 months. Brushes went out. So, by then, I had enough $$ to buy a rebuilt one from autozone for like $150 or $175 somewhere around where and it had a lifetime warranty. I went through like 4 of those over the course of a couple years. lol. But, they were all replaced for free. Then I got tired of changing alternators and getting stranded at any given time or place so I sold the car. If it's your alternator, I would say get a rebuilt one with a lifetime warranty due to my previous alternator troubles. Let us know what you find out!
