I have a 91 300sl and Ive replaces the battery wih a new interstste. But after about 2 days parked the car is dead. I noticed that if i gently rub the neg post of the battery with the negative cable, I get some small sparking. Ive read all the past posts and Ive removed every fuse I could find and still the same. Also I dissconected the radio and Alternator and still does the same. What the hell is going on? ANy Ideas anyone????? THanks guys.