I just performed a test on my passat (2011 1.8T), I was unable to attach to the cable directly connected to the alternator, but I was able to get the cable exiting the battery (so the power consumption of the car).
I must admit the test most probably did not work properly beacuse of the clamp type voltmeter that I used. But the car was drawing about 2A, when revved up 2.5A when all of th edevices inside (stereo, seat heaters, heater blower, rear window defrosting) the current went to 6A. That does not seem right as that makes about 85W, the seat heaters alone should be consuming that much.
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