The alternator failed in my Escort back when a friend owned it twenty years ago. The rear bearing had failed to the point of allowing the rotor to scrape the steel parts of the stator, so I replaced just the bearing, as the brushes were still fine. It's worked great ever since, although I underdrive it by about half, so it has an easier life. I am constantly disappointed in new ways with new and exchange rebuilt parts, so try to do as much repair myself. There is a very good auto electrical rebuilder in my city where I can buy individual parts, or have my own starters and alternators rebuilt, if I choose. There is definitely a difference in the local rebuilt items and parts store, exchange rebuild units. The difference is that the local rebuilder does a good job.