[F104]

Just out of interest I've been measuring battery voltage while driving. I do not see what i would expect from the alternator being cut out. My system voltage measured at the battery terminals changes between 15.0 (most of the time) and 14.7.
With an alternator being cut out (efficient dynamics) I would expect voltage to drop to about 12 V. Furthermore upon acceleration the voltage doesn't drop, and upon coasting breaking it doesn't jump up. Thus I wonder what's wrong on my car?

The voltage readings while stationary match my Fluke well, and also upon shutdown i seem to get good readings, voltage dropping immediately to 13V, and then going down over time to 12V.
However I also noted that when i haven't driven the car for 24 hours the battery is just below 12V

Anyone has some experience here?