There is definitely power at the fan plugs. Readings on the meter increase/decrease with observed engine speeds, and CCU readings -- with one exception:

At the 21.1 level, the voltage at the meter can spike high, or go low. At levels below 21.1, the metered voltage matches the display.

Sounds like something else is responsible for this errant (21.1) signal.

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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