Well, what size is the misterious bulb? If it is a small 5W bulb or similar it is definitely the Euro marker (the U.S. market use markers or "parking lights" as they are referred to in Europe at the turn signal assembly). In Euro and rest of the world the parking lights are installed within the main headlight assembly and besides providing parking assistance to view the car at darkness, they also provide a low light reflection on the headlight assembly when the low beam is burnt.

I assume that on your C43 AMG they just installed the same headlight unit as in Europe and per U.S. regulations it just doesn't turn on.

On previous M.B.s the U.S. and European headlight assemblies used to be completely different, but from the early 90's they are almost or exactly the same (except for the parking light issue).

Does this solves the mistery???

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]