I did the same thing, I ran it into the 6 pin to run the city lights, but I also made a "Y" out of that wire. One end running to the 6 pin plug, the other running to my turn signal marker light. You can buy a push type plug from AutoZone that will fit the post perfectly. That way I have the city lights AND the side marker light....don't have to worry about being seen from the side...or the law.

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'86 420SE Euro
904 Midnight Blue, Gray Velour
Dad bought it new, now I own it.

"A Mercedes-Benz is like a fine wine, it only gets better with age."