My Girlfriend just bought an 87 190E 2.0. She's had it for a couple of weeks so far with no problems.
Yesterday her turn signals stopped working. I wont be seeing her until the weekend, so I had her check the fuse because I know how funny these can be. It looked good and her horn still works (share the same fuse).
Her hazards still work, so the flasher relay is good.

I've been looking at my w126 electrical manual, and the only thing I can think of, assuming both the w201 and 126 are similar, is that the combination stalk itself is faulty, or the wiring to it has broken/become disconnected.

Any other helpful suggestions?

Ben

Look at the 4-way flasher switch. After using the flashers, the switch does not always move the whole travel in the off position, even though the flashers are off, and this short travel disables the turn signals.

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1991 300 SEL
218,000 Km

"Xsbank's rules of mechanical intervention: Always go for the easiest solution first; 90% of what ails a gasoline engine is ignition; After that its all a WAG."

As you say, the horn and flasher tests rule out the fuse or wiring to the lamps. If you can rule out the flasher switch's rest position, then the most likely culprit is the combination switch on the steering column.

Dont forget the turn signal relay

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Ok, I relayed this information to her, and she now remembers that she used the hazard lights for the first time the same day that her turn signals stopped working. She said the switch felt 'gritty'. I told her to spray some contact cleaner in there and switch it on/off several times.

Hopefully this will be the cure!

Thanks.