One last idea in desperation. Is there an auto repair facility nearby. They may let you connect up the motor to a battery for a quick test. I don’t know about Germany, but here in America, a crisp bill discreetly passed to the mechanic would get you the help you needI don't know why it seems so unbelievable that I don't have a car. Is this an American thing? As a student in Germany you just don't need a car to get around and I currently don't have access to any of my friends' cars.