I have a 1984 mercedes 300D (European) I have had some problems with my battery lately. It seems like the alternator is not charging the battery. It will be running fine, and then out of no where it won't start. The first time it has happened I thought it was just that the battery had died, but then after getting a new battery it died again about three weeks later. I got a new battery again and the same thing happened again. I am not really sure what is going on. If anyone has any idea please let me know.