If power is going to the relay but it isn t clicking either test or replace the relay pelican 002 542 74 19 m44.
Slk roof switch not working.
One trick that you can try is to locate an identical relay in the fuse box keep note which system it serves and swap it with the convertible top relay.
You can also bridge the top relay for a couple of seconds to see if the hydraulic pump start to run.
Replace the convertible top relay if necessary pn 0025421319.
Slow blinking red light.
Relays are affordable and having a spare is a good idea.
They often seize up give the rod a bit of a twist and then close the boot.
Swap it with a known working relay that is identical.
Check the convertible top relay as well.
When putting switch in close position answered by a verified mercedes mechanic.
The relay can not be inspected visually but there are ways to test them.
Roof will not open after dead battery.
If the relay and the fuse are not the problems move to the next step.