It's a very long shot but check in the fuse box for metal trash, perhaps even burned fuse strip ends or pieces, that might be bridging two circuits. One way a circuit can melt instead of blowing its fuse is if it's getting power from a different circuit through a mechanical short that shouldn't be in place.

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~Michael S.~
Past cars:

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


Current:

1987 300SDL