Have a problem here. My girlfriends 1993 Mazda MX-6 has gone through 4 Alternators in about 3 months! Yes that is right 4, I replaced them with used ones from the wreaker but tested each one and it was fine! A week or two goes by and then it dies? Each time the same thing happens, the charging system is fine full charge from the alternator when installed then it dies a week or two later! The regulator I know is inside the Alternator so that is not an issue! What else could it be? What is killing the alternator all the time? Mazda looked at it last time and said the Alternator was bad fine I replaced it again but something has to be killing the damn thing! Any ideas?