Vintage Cars: 1978 450SL, light bulbs, hazard switch

Question
i HAVE A RAPID CLICKING NOISE WHEN i PUT ON THE DIRECTIONALS. I'VE REPLACED ALL FUSES. NO BURNED OUT LIGHT BULBS. COULD THIS BE THE HAZARD SWITCH, AND IF SO, WHERE CAN i GET A REPLACEMENT>? tHANX.BOB

Answer
perhaps, does the directional hold in place? Sometimes it can not make suffucuent contact to allow the circuit to work properly.  try holding down or up on it to see if it helps, if not then the 4 way could be the issue or perhaps a bad bulb or short.  Are the bulbs blinking?
The 4 way can be taken apart and cleaned pretty easily, just pay attention to the little springs and how it goes together.  If you dont want to mess with it , I have a few lying about that I could sell if the parts numbers match
Just let me know
Ron