Quote:
Originally Posted by N5GKP
So, if you can access the instrument cluster secret menu set it to the voltage screen.
Go for another drive and watch the voltage, when you accelerate does the voltage sporadically drop to around 12.3-12.6V? And then brake and see if it returns to 14V+,
If thats whats happening id be happy to say I don't see it as an issue. 'Smart' alternators tend to switch on and off quite often when driving, for efficiency's sake BMW have tried to work it so when the engine is under load, unless necessary the alternator will briefly turn off and then turn back on when on overrun / deceleration.
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Will test that soon, but I just went for another drive and alternator was stuck at 12v again, didn't move at all just 12.1v measured both the alternator and battery when I parked up while engine running and still 12v. What does that mean? The car has two states, it either starts up and outputs 14v or starts up and outputs 12v there's nothing in between