Yea, I've noticed alot of electrical part's in general (Starter's, Alternator's, misc electrical motors) have been suffering a bit in the way of quality workmanship. I've found quite a few where it was simply that an internal terminal nut had vibrated loose.
If it's not working, may as well try to get inside it and have a look, it just might save you $100 or so.
Once I had even come across a manufacturer of Alternator rebuild's, used 3 from them, and each time I had found that the leads from the winding's where they were soldered to the stator had been so grossly over-soldered that they were actualy ripping apart the internal connections for that modle alternator's Rectifier bridge. Needless to say, the third time, I just bought the replacement diodes, pressed them in and took a file to the solder monster's, never again to find a mysteriously discharged battery on that car again.
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