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Strange, the audi alternator only has a THICK red (obviously positive) wire. The body must be the GND.
I used to have some small-current (5..6 pin) connector on the alternator (on my cars earlier, at least where I checked). Maybe for the charger-control, or to disable charging at full throttle.
I guess the charger-control is integrated inside the alternator in these audis.
It will be easy to see if charging works, by looking at the battery voltage (standard procedure anyway).