I just measured voltage at battery:

. 12V engine off
. 14V engine on.

will see if I can run some longer wires into the passenger compartment in the morning, when the problem occurs. I expect it will happen when I hit the accelerator for the first time, so that is when I will be watching the meter.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black