Can someone tell what this cord is for? I pulled up rear carpet in my 81 300D sedan and I found this coming from under my driver's seat and I never noticed it before. My car originally came with electric windows and was converted to manual windows by a previous owner. My seats are manual too but is it possible that they were originally electric too? Could this plug be for electric seats?

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my guess is seat heater

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No that is the seatbelt warning switch light. It should attach to a matching cord coming out of the seat belt latch.

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1985 300 TD 448K
1984 300 TD 278K

1983 240D euro 240k
1994 f-250 idi turbo 330K
1986 f-350 IDI
1987 F-350 IDI

1985 JD 1050 4wd
1965 IH 3660

That is the male end of the wire that originates at the driver's seat belt assembly. The female connection is typically located directly behind where the original carpet floor mat ends at the front of the driver's seat.

Is it the case that you have no operating seat belt warning light and buzzer?

Others are correct, seatbelt warning buzzer. No harm in having it disconnected, unless you miss the charming buzzzz..

It was indeed for the seatbelt buzzer. I found the receiving end and plugged it back in. Thanks for the info Everyone!