My alternator keeps frying. I've had it repaired by a reputable vendor at least 3 times now. It will last about a week and then short out again. I got tired of taking it off and putting it on every few weeks and have resorted to using a trickle charge on the battery once a week or so for the last 2 years. But that is also trying my patience. I'd like to find the culprit and fix it. Its left me stranded too many times now. I've taken it to my mechanic, who found nothing suspect, but was willing to keep looking, indefinitely, at the shop rate. He's not cheap. Today I pulled an alt and a starter (for good measure) at the pick 'n pull so at least I have a fresh start. It doesn't really seem to lose voltage except from normal use (starting, headlights). In other words, it doesn't seem to drain just from sitting, and there doesn't seem to be anything quirky happening just from running off the battery. It's just that the alt blows soon after repair/reinstall. How might I go about discovering the cause? Any thoughts are greatly appreciated.