My F30 battery keeps dying overnight. Had the battery tested and its fine (2 years old, AGM). Something is draining it.
Ive tried:
Still drains. How do I find the parasitic draw? Do I need a multimeter or can ISTA show whats drawing power?
Use a multimeter to measure parasitic draw. Disconnect the negative battery terminal and put the multimeter in series. Normal draw should be under 50mA. If its higher, start pulling fuses one by one to find the culprit.
common culprit on F30 is the comfort access module. it can stay awake and drain the battery. try disabling comfort access temporarily to see if the drain stops
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