So I was messing around with my 300SD and installing an Alpine accessory when I came across these two plugs. They were behind the carpet on the passenger side sideway. I assume they should be plugged into something, but I could not find anything that was unplugged. Anyone have any ideas?

They may be for an alarm system. You should put in your signature what year 300SD you have so we don't have to ask, what year 300SD do you have? That might affect the answer. We need to hear from some SD owners.

Jeremy

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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

It is an 85 300SD California car.

They look like connections to the alarm system. My friend has an 85 300SD and it has similar plugs.

John

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Certified Registered Nurse Anesthetist (CRNA)
2002 F250 powerstroke with Plantdrive WVO conversion
1983 300SD 190K miles ,sold
2006 E320 CDI

Interesting! I did not know my car had an alarm system. Or is it that it just has the connections and not the alarm?

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1985 300SD California Standards

My guess is it was disconnected because the alarm was going haywire. I know we disconnected mine for that very reason.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL