I think I found part of my problem... I don't think the alternator in my car is the right one, it might not even be for a Mercedes..
I was trying to look behind it to see what which replacement VR I should get and couldn't even find one...
The connector isn't the right one and is ghetto-rigged
Also the tensioner nut thing is not in use whatsoever...
I always had a shady feeling about the alternator... I'm amazed it works at all.