Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
have you tried cranking the engine over by hand with a breaker bar, to be sure the engine turns? How many miles/km are on the vehicle? Have the timing chains every been changed?
OK- and a Mercedes specialist can't find the problem? When you try to turn it to the start position, do all the lights on the dash go out, and accessories shut off (power supply relay cuts off power to anything unnecessary in order to direct all power to starter)? Do you have battery voltage at the starter main cable, and do you have battery voltage at the solenoid terminal when turning to start position?