Re: Alternator?
Autozone, huh?
I bought a used A4 3.0 recently and the owner had not been driving it much. It was a little hard to start and I convinced him the OEM battery was dying. (Knocked a grand off the car for a battery and brakes.) I took the car to Autozone during a "test drive" and they told me the battery was no good. They could sell me one for $130.
After I bought the A4 I took it to my regular indie shop (who has cared for my A6 the last four years) for some brakes and a battery. He tested the battery and declared it fine.
Caveat emptor with Autozone and their battery testing.