Finally got to do part of the voltage tests. The x5 is off the road now due to a wiper problem.
The vehicle has been sitting for a week, it’s 1degree Celsius. At the battery I started with 11.6 volts. Started it up and have 13.8 volts at the battery, 14.0 volts at the front jump point. With engine at 1500 and 2500 little to no change, maybe .1 of a volt. Engine off , lights on etc. 11.6 volts.
I have not cleaned the terminals at this point. Hope to clear the garage in the next day or so to make room to bring the vehicle in.

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Mark
2006 X5, 3.0 L
232,000 km