Turn signals not blinking (1981 230E w123)

[alfa 75]

Hi,

First off, the car I am having problems with is a 1981 w123 230E, so not a diesel, but my issue is not diesel-specific.

The turn signals started acting odd (working intermittently, etc) a few months ago and both the signals and the hazards stopped working a few weeks ago. I looked at the fuses and the bulbs, everything checked out okay.

I swapped out the combination switch with a spare I had laying around but it didn't help the problem. Finally, I changed the hazard switch (this is the early one with the relay mounted below the switch mechanism) and now the turn signals come on but they don't blink, and the relay makes a buzzing sound. The switch worked fine when I pulled it out of a 280E, and I took it apart to give it a thorough cleaning but it didn't solve the problem.

Am I overlooking something?

Thanks.