turnsignal relay...
 

old part number 000 821 09 63 has 3 prongs...ordered new one, I got 3.101.200 which has 4 prongs see

http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?header=header.jsp&footer=&product=0008210963&partner=mercedesshop&baseurl=http://catalog.peachparts.com/&clientid=catalog.mercedesshop&cookieid=1OZ0OB9FZ1QP15YXQC

will this part interchange with the old part?? I hate to install it, have it get fried or fry something else, and most places are picky about returning electrical items.

Welllll...I had to get the MB outta the shop, and the socket had four holes, so I stuck in...it did not work....still no turn signals

So I said a potty-mouth word and then i remembered a thread that said flip the hazzard switch and it started working! Man, I love this board! I was fixin' to break out multi-meter and settle in for a lot of wire tracing & short shooting and all I had to do was jiggle the hazzard switch.

This Bud's for whoever posted that tip! And if you are looking at two different looking relays like mine, it'll work.