New to this forum. I'm in my second '84 300SD. I replaced the alternator about two weeks ago with the old one from my parts car. Today it is not charging--again--. Any ideas as to the problem. Is there something burning out the alternator? Everything seems to be working. Gloplugs,windows, sunroof, heater etc, that is until the battery loses it's charge. Any suggestions, I'm stillo a little green at the electrical stuff.