Thanks to a certain certified Mercedes genius via PM: Spin the headlight fuse.

Worked perfectly. So remember that future generations of MB wrenchers: Always check the damned fuse box, EVEN IF you're showing 12v.

Thanks AD!

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress