I have a 2001 CLK203 (C208). The car had a dead battery which I replaced. After fooling around with windows that didn't close properly anymore, I experienced some issues with turning the key making the car start.
Let me explain:
If I put the (electronic) key in, nothing happens (small tiny tiny sound somewhere in the back of the car). But all is completely dead. It's not the steering lock preventing me from turning the key. For some unexplainable reason 5 minutes later it worked. Key in ignition, key turns, car starts and runs beautifully.
BUT THEN: Next day when I opened the car and wanted to start the car the same thing happend. I can't turn the freaking key!
I started swapping fuses to see if something was burned and by mistake I put FUSE 26 (Instrument cluster) into FUSE 27 (can't remember what it is, but it was empty / optional). Guess what: The car starts after 5 minutes.
Now my GF which drives the car complained about not having a speedometer, so when she came back from grocery shopping I, confirmed the instrument cluster (Fuel gauge, speedo, RPM etc) was dead.... So opened the fuse box and noticed that I misplaced FUSE 26 (into FUSE 27). So easy fix right? Placed FUSE 26 back. car starts, happy days!!!
Not really because after an undefined period of time (2+ hours) the freaking car key wont turn and wont start!!!
So, as rudimental is I like to be wedged out FUSE 26 and 15minute later, freaking car starts.
Whats busted here?