I had been having turn signal flasher problems for some time now on my 300D 1976 W115.

Since the flasher relay for the W114 and W115 is no longer available new I was able to purchase from NAPA a solid state #263 flasher ($16.99) and adapt it to work in my 1976 300D. The original flasher Bosch 0 335 200 007 was flashing too quickly and I even attempted to resolder and repair the flasher with no luck. Used ones are available on ebay etc for $40+ but you are taking a risk that these would not work either.

I had read an article that said to buy a NAPA NF550 3 prong unit but NAPA has discontinued these so I bought the #263. It is 3 prong but I found that you only need to use the 2 prongs labeled X and L (the prongs face each other) and solder short wires with bullet connectors on the ends to plug in to the original base. As I found out the third prong is not needed and will only short out your fuse when connected so I eliminated that wire. Plug the 2 connectors into the original base holes labeled 1 and 3 in your car.

The flasher works great now flashing at the correct interval for both the turn signals and the emergency flasher. I am pleased to have a new unit for only $16.99 instead of $40+ used. Pictures attached..

I hope this helps someone with the same issues I have run across.

John

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Western NC
1987 300SDL W126 Turbo Diesel 335,000 + miles
1976 300D W115 275,000 miles+