I have a 1983 240d and I did the Bosch Saab 9000 AL129x alternator swap for higher output. I also have brand new terminals, and a brand new 900 CCA battery in the car. For some reason, my battery still dies overnight. I ordered a new belt since this one is squeaking, but I'm wondering if it could be the alternator being wired in backwards. I had to cut the connector off that plugged into the old alternator and crimp on new connectors so I could attach to the terminals. there were two red wires and one blue wire. the small blue one I figured was to tell the alternator when and when not to charge the battery, but the two red wires are up in the air and I think I may have an issue there. I have heard that an alternator hooked up in reverse will kill a battery very quickly. Any help would be greatly appreciated.

Thanks!
Alex