My daughter bought a used beetle, since we had it the battery used to drain within a day or two. I have now replaced two alternators, three batteries,and when I test for a draw across the negative cables I get 0.15mili apms that should not be enough to drain the battery over night. I have just replaced the key ignition switch, put in another brand new battery, when I scan it with vag-com I have no problems. When I arm my car the horn does beep to arm the car and all of the interior lights are off. I have a monsoon radio system in the car from VW I know the amp is not drawing anything and it is good. I have no aftermarket product in this car at all. It is all original VW parts. When I disconnect the negative cable and test the car for two or three days straight I have no problems with the battery drain. Soon as the connect the negative battery cable and the car is used for a week. Then the drain comes back. Not able to catch the drain and where it is coming from. I have spent hundreds of hours trying to track it down. I have brought the car to VW specialists. When the car is at the shops the car behaves like it should. When the car comes back home the drain begins. I have pulled every fuse out of the box to see if I had a drain when I put the fuse in. I have exhausted all of my possibilities to solve this problem. I have read numerous posts all over the web and still can not find a solution. Can someone shed some light on how to solve this problem??