Turning light woun't blink

here:
MBSLK.de - The SLK-Community - Dauerblinklicht

Arotished said:

My turn light will not blink to the left or right, it just stays on. Guess the relay broken? And most of all, where is it?

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The German article referred to comments it was a temporary fix and the real culprit was the Combination Control Module in the engine bay which often has dry solder joints. We all wish it was a simple relay - it isn't.
Several remedies to try:
1. Undo the wiring harness from the CCM, clean contacts with spray and refasten. Remember to have ignition off and key out while doing this.
2. Open module and check relays for bad contacts and also for dry solder joints. The last post on the thread says the largest relay in the CCM is the blinker and the contacts can get dirty (and presumably stick shut).
3. Replace module (expensive though)

There are several posts on this subject on the forum - some quite recent.
Good luck!

One other item to consider is the combination switch; i had this problem last year.

Problem fix, had a look at the relay today and the wire was loss. Thanks for the picturs!

MBSLK.de - The SLK-Community - Blinker Reparatur

My relay had a bad contact, so I attached it back

I had a similar problem last night where my turn signals would burn solid, but not blink. It also happened when I turned on my flashers. I was afraid it was the CCM, but it turned out to be my interior light fuse. (boy was I Happy)

Belatedly,For those who have the same problem of indicator lamps and hazard lights staying on permanently. The 10 minute fix listed above ie: to move lighting switch and fuse box, gain access to wiring at rear and waggle to clean/re-align wiring blocks has worked a treat for me!!!

Many thanks to all.