Get a measure of the amps while cranking.

You describe the symptom of end of life starter that pulls more current. It'll sound like low battery when it's the voltage dip from starter taking up to 50-70% more current.

I can't remember if the B+ terminal separates like the 3.0 but occasional thread on xo will have that cause give you that symptom.


–awr–

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)