I use a generic wifi obd adapter and dash command app for iOS but Android id use torque if still available
Not a lot of control over how long it will log but you only need to have a few minutes to show a voltage dip.
With fluke you can hook up and monitor min/Max as long as you want you won't get as much info as a graph but you only need to know if the min gets below 13.
In my case my oil filter o-ring seal leaked and got oil in my alternator. It coated the slip rings and simply made the alternator less efficient and when dropping from under power to coasting to a light it would dip to below 13v. Tripped the DSC light.
I've also had a loose abs sensor: that will trip abs almost immediately but will also reset each drive.
I have valeo alternator and there's a $20 kit to replace brushes and slip rings.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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