not sure how to explain other than to say i dont trust their machine or the caliber of the guys who run the tests.
Once again I am not telling you that your alternator is bad.. I cant diagnose your car over the internet however you have so far ran a lot of tests and not found anything wrong in the car thus far.
I would try the last test I suggested and let us know what you find. As I mentioned before it may be a good idea to take the car to a qualified BMW shop and have it tested by a qualified technician. Im happy to help as much as possible but theres only so much I can do when im not standing in front of the car.
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