I've had a couple go bad in my VW...an $11 flasher relay (decades ago) solved the problem.

I am assuming you are referring to your 300D in the sig? I don't know if MB designed a combination relay in 1985 or just used separate relays for the electrics, but that is what you need to find out.

My intermittent wiper system went kaput on my 93 300E, and I replaced the combination relay...which also controlled the flashers and I believe the rear window defogger(?). Those other components worked fine, but with the bad wiper circuit, you still had to replace the whole relay...around $100 a few years ago.

I would check near the engine fuse panel...look for black "cubes", which are typically plug-in relays...quick and easy to replace.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car