I think I'm going to have to entertain the thought that perhaps my car is killing these alternators. Alt #3 just crapped out this morning. Got about 100miles out of it.

Maybe GP relay? I don't know. It seems like it's shutting off properly. I can put a multi-meter on the battery and see when it clicks on and off by the voltage change. Once the glow plug relay has clicked off, unplugging it does not elicit a change in reading. I've also tried pulling the fuses one by one to see if any voltage changes occur, they don't. I don't regularly run a lot of electrics either, hell it's been cool out so I haven't even been running the A/C. Since I do most my driving in the day it's been the radio and that's about it except the brake lights and blinkers.

Battery tested good and comes back with 12.7vdc when fully charged.