2000 ml320 died now won't start

I tested the k8 relay and the k12 and both were good..also all the light turn on in the dash when I turn over to position 2

Check for blown engine fuse in fuse box under the hood.

Any fuse in particular?

All fuses were good except for the central locking fuse

My 1999 Mercedes kept cutting off and wouldn't start every 30 minutes. My neighbor put it on the machine. It said misfire in cylinder 1, he went to the junkyard got a coil pack, took 5 minutes to change it, it had a small crack in it. I've been riding every since.

Sergio, did you get your MB fixed ?

I had the same issue. I almost gave up, until i started wiggling the relays inside the engine bay. K12 had some play and the car shut off when i moved it. Replaced the Relay with a new one, and the car started right up and stayed on. I wiggled the relay in K12 and no play. I think i resolved my issue with my car dying randomly while driving. It would run, and shut off a few minutes later. Then when i would try and restart, it would not turn. I had to wait ten minutes before the engine would turn again.