Car won't start? E420
 

Our 1995 E420 just randomly stopped starting. We drove to our destination came back to the car to leave approx 2 hours later and it would not start. The battery and everything seems to be fine. All the electronics work, it just won't turn over. Any ideas?

So you have full power from your car?

Do you hear the starter cranking?

How old are the keys?

The starter motor?

Draw from the electronics is not as strong vs the electrical. So just
for the heck of it, start from the source: battery. Be sure that not
only that clamp is secured to battery post, but that it is clean and
free of sulfation and spooze. Wire brush and reconnect ....but be
aware that electronics may reset and need resync-ing.

Once you've done this and confirmed good connection, then you can
begin working down stream for other problems to isolate.