looking for the schematic for the stereo wiring, previous owner butchered the removal of the factory stereo (been driving for a year with no sound) and would like to put a modest CD player in but plugs are missing and was told $100 to rewire the car. I have installed many a stereo but have been told the Mercedes used a single chassis ground config. Anybody know where I could obtain the color code chart for the wiring? Thanks for any help