I took my 76 vw kombi for a short test drive around the block after replacing the gear box coupling. The next morning I jumped in to go to work. Turned it over and it slowly turned over about three times. Dead battery. Went to work came home and disconnected the battery and put it on charge for 48Hrs. Took it off and left in for a day or two and checked the voltage. Reading about 13v. So I connected up the positive got my 20 amp multi-meter and placed one end on the negative terminal and the other on the negative strap. Sparks went flying and multi-meter over loaded. So I pulled all the fuses out and tryed again, same result. So I disconnected the starter motor, hot start relay and voltage regulator and tryed again but same result. I don't have a dual battery set up and the battery is 6/7 years old. So what could be causing this?? A faulty battery??