Front Interior light remains on after doors are
closed. The light component is getting a false signal that
the doors are "open". I've unplugged it, changed bulb,and
still light remains on. ??

There is a dial right on the dome light, have you tried that yet? I forget which it has to be set to but there are 3 positions. Always off, Always on, and on when the door opens/closes for a few seconds. Pretty sure middle is always off. I believe forward is on when the door opens.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD

Do the puddle lights on the bottoms of the doors remain on?

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

The timer in the switch may be bad.

__________________

"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

Shouldn't.

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83 SD

84 CD

The puddle lights work. It's just that they never
seem to stay "in place". Constantly have to shove
them back in place. ?? THanks bud !

Then it sounds like your dome light iself is bad, there is a time delay circuit in it. If you are handy with a soldering iron you could probably fix it, it's a fairly simple board.

-Jason

__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.