My vehicle has no power, no crank, no sound, no power. I replaced alternator and battery. Still no power need help please.
You have a blown fuse or bad connection at the battery. There is an inline fuse called a PREFUSE. This is on the red wire that connects from the battery positive tot he alternator. So you can us a multi-meter and check for battery voltage at the alternator. If you do not see battery voltage there then most likely the PREFUSE is blown. Repair or replace as needed.
Starting Wiring Diagram 2009 Mercedes Benz R350