If your Technician tested your alternator for a back feed caused by faulty diodes I would agree.... Very easy to test by using a clamp on amp meter. And it will show you amp loss when the key is in the off position. Besides small amp usage age for your ECM and radio your amperage should be very small. You can always pull fuses while testing to make sure there is not any power loss coming from your trunk light, engine light, etc.
SOURCE: Car Battery draining over night
Something is shorted and it could be very difficult to find sometimes. It could be something as simple as a button being pressed when it shouldn't turning on a light or feature that runs all the time, but in a 2001 that is unlikely as it should turn off all lights after a certain period of time. It could be something in the radio. What I suggest is to pull one fuse at a time for accessories, check your manual for what each fuse powers. If the battery still drains with that fuse out then put it back in a pull another. When you find the fuse that allows your battery to keep it's charge then you will have a much smaller field of offending components.
For example, if you pull the fuse that powers the radio and heater, and the battery keeps it's charge then you know it is either the heater or radio causing your problem.
This can take a few weeks to do completly but won't cost you a penny to do.
SOURCE: 2002 s430 mercedes benz alarm keeps going off
change the batteries in the car alarm remote if you can.
SOURCE: MY WILL NOT START THE CAR C240 MERCEDES BATTERY IS NOT DEAD
I am assuming that the engine won't even turn over. could be lots of different things. The simplist is to make sure the car in in PARK , won't start if not. Other things could be , Security imobilizer if you have one. Does your key have a electronic chip in it ? Try your other set of keys if you have one. Check if battery connections are clean and tight.
SOURCE: battery on mercedes A140 drains. I drove the car
aftermarket stereo? dome lights? car alarm? Use a multimeter and see what fuse has power draw when car is off.
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