Well, I read both the current topic, and the prior thread nicely provided by horseydug. I would have to agree that since you took it to a shop for repairs, they should have fixed what was wrong. Also, reading both threads, it seems you might have done something to your wiring when you undertook the initial parts removal/cleaning. I don't know if you did or not, but you should always disconnect the negative battery terminal when working on your car, for safety reasons.
Incidentally, I have changed the alternator on my v6, and I agree that it is a MAJOR PIA, and something best left to a professional, or someone knowlegable who doesn't get frustrated easily.