Well more issues with this car it never seems to end.. Here again because I'm at a loss. Drove the car two weeks ago slept over a friends house, next morning went out to start the car 3 cranks no start, then no crank. Figured my skeem finally went.. Pulled the ECU, Skeem and sent my key off to Mercedes swap shop. They re-cased my key, reprogrammed all my stuff and said they bench test in a car 30+ times to insure starting. I just got it back today. Threw it in the car and same symptoms. (my battery was pretty much dead, we threw it on a jump pack same 3 crank no start I'm getting the battery charged tomorrow as its not even 2 months old) I'm wondering what to even do at this point, I've made sure the connections to the ECU are seated properly along with the Skeem. Checked the wiring on the antenna seems to be fine. I'm wondering if I should replace the antenna? Unrelated symptoms just to put everything into perspective my central locking pump I replaced a while ago worked fine, unlocked and locked from the dash as well as the fob. Now I checked and fuse 25 was blown, the pump only unlocks now from the dash but I'm assuming this is unrelated to starting because I've had the entire pump out and the car still ran and drove fine. I checked the wiring for corrosion and there is no water in that area. Also my key will not re synch I've tried multiple times and nothing is working (yes the batteries are new and I see the red light in the fob when pressing the button) If anyone could please point me in the right direction I'm ready to rip my hair out.