Where can you find the live ignition wire for stereo in Mercedes c180 2002?

there is no ignition wire for the stereo, so what you need to do (what i did) is take the ignition wire from the cigarette lighter, as it only works when the ignition is on. i extended my stereo live ignition cable (u can use any wire) and fed it through to the cigarette lighter cable, made a little cut in the plastic casing of the wire, attached my wire to it, covered it with electrical tape, and voila, the stereo now works as normal!!

hope this helps, if its not clear, let me know.

rikxx