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Also--who knows how accurate the volt-sensing chip in the CCU is? Couple that with differences between that sensor (it's a CCU, after all, not a DVM) and the OP's voltmeter and you could easily have a couple tenths of a volt difference. Finally, the OP may be measuring system voltage at the special terminal under the hood (he doesn't say) while the battery is under the rear seat.
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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