Could said wet connector have caused an undue battery drain before the car was shut down, with the load from the other always-on systems, i.e. alarm, clock, etc., accounting for further drain, which normally would have no impact?

I just find it odd, and no coincidence, that the ASR issue has not occurred since that sensor was replaced.

As an aside, two years ago, in one brief, freak incident, my ABS pump kept running after the car was shut down. I don’t see how it could have occurred with the car off/no circuit, but it did, which made me wonder whether to same thing could have occurred on the other side of the engine, with the coolant sensor plug.

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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