Hi, I just picked up a 91 323 se REALLY cheap, and now I know why. For some reason the battery is not charging from the alternator. Hopefully this is the right place to ask about it.
I would look closely at the wiring for the charge system. Somehow, the juice isn't getting from the alt. to the battery. Double-check all connections, insulation, grounds, etc. Sometimes the tiniest little thing can be the culprit. I just picked up an 89 323, myself, and the PO had just replaced the alt. Mine also electrical problems that I haven't gotten around to yet. Good luck.