My 2014 E 350 has the first real starting trouble. I didn’t use it for about a week and was told by wife that car wouldn’t start. When I checked the battery seemed dead.
So I called roadside assistance to jump start the car. Well they came but it wouldn’t start. It just kept cranking in jerks every one second intervals. Whenever he would disconnect the jumper cable the entire power inside car gets cut off and the guy said that should not happen normally. Called in Mercedes helpline and they sent another guy who tried as well and finally towed it to the dealership on a flatbed. Anyone has an idea what could be wrong. The car has extended warranty (7 years) and I’m hoping that will take care of the problem for now. Dealership stated they would probably look into the car tomorrow. I’ll try to post a video of the crank efforts. Thanks.

In case anyone is interested, it was the starter battery that failed. Dealership changed that for about $400 and unfortunately that is not covered by the extended warranty.

Edit: I could not directly add a video file even though .mov is listed to be an accepted file in the website. I posted the original video on youtube.

https://www.youtube.com/watch?v=gBfFL-H_uMc&feature=youtu.be

.