Ok, I found the flasher relay, but only in the wiring diagram. If you are familar with these diagrams, they are not specific as to where the individual components are. You could try under the driver's side of the dash. It's not too hard to remove that lower panel. According to the wiring diagram there are 2 wires going to this relay. One wire is black/red and the other is black/green/white. The connector isn't very big. As someone has already mentioned, sometimes by turning on the hazards will get things working again. I have had this happen to me on my '83 TD. I lift the turn signal for a turn and nothing. I turned on the hazards, which worked, then the turn signals worked.
Sorry I couldn't find the exact location for you, but the manual wasn't very helpful in that reagard.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section