eclipze

Well,,my 550 wouldnt start one day so I checked battery, just to make sure tight connects,,and went to start it and it started. Few days later went out to start her, and was dead, so i jumped her with my diesel truck,,no luck,,took battery out and had it slow charged,,put back in and no start, everything else works,,key turns ,lights work, stereo works, etc,,,new battery is about 3 months old,, please help me,,thanks

sears1234

I had similar problem on my 12 E350 couple of months ago, I can turn on electricity of the car, operate audio, gps, ets, but couldn't start the car.
My car had CPO coverage, so it was towed to MB dealer, and they found it has bad relay somewhere.
But few days later, the car experienced exact same problem, I put into same dealer, and they found another bad replay at back-end.
After they replaced both relays, this problem never happens again.