One problem related to alternator/generator/regulator has been reported for the 2008 Mercedes Benz C300. The most recently reported issues are listed below.
On July 21,2016 at 9am and I parked my car and went to work, 2 hours later came back and try to start the car, did not start. Car door locks and trunk locks open and close but when I turn the ignition on , no response, no display on instrument panel around speedometer gauges. No hissing or cranking or beeping noise also. Steering column was also locked up and inoperable. About 2 years ago command screen with lcd display that controls all functions smoked a little and was shut down display. Going to the last weeks problem steering column has locked me out and also eis that is the communicator from ignition switch and alternator or started do not function also. I happened to see more than hundreds of car with the same year group and model has smiliar problems . My car mileage was 93121. I would like make this as a manufacturing problem of unreliability of the parts and the manufacturer let it roll off assembly line with out doing diligent testing of the parts involved from the suppliers for reliablity and durability and in turn cost the consumers $2000-3000 of unnecessary expense/troubleshoot and fix/ than you very much for your help.