It is possible that there is a bad connection underneath the fuse box, and that current is not reaching the fuse circuitry.

This caused my blower to cease blowing, anyway.

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Semibodacious Transmogrifications a Specialty

1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)

"Time flies like and arrow, yet fruit flies like a banana"
---Marx (Groucho)