Hi all, buying my first audi, it is a b5 s4 with a 2000 a4 2.8L. the guy drove it to edmonton alberta from ontario after recently putting an alternator in the car, he said 20 min outside of edmonton the battery light came on and he just made it before it stopped running. is there something i should be looking for that causing the alternator to fail? or could it just be a faulty battery? any ideas are appreciated. cheers.