So... i replaced ignition switch, start lockout relay (couldnt hear or feel click so replaced now i can feel it click when i turn the key. Replaced overvoltage protection relay with genuine mercedes because it was offbrand and suspect. Tested continuity at harness leading to trans park safety relay and get continuity in park or neutral not in any other position so feel that is good. Can start car by shorting x27 under hood drivers side pin 2 (violet white) to battery pos starter will turn and if key is on, starts and runs/drives fine... what am i missing?

Weird thing is i get like 10v on that pin with ignition on, is this normal? I know from looking at schematics that this circuit is also tied to fuel pumps but thought it was odd to see any voltage whatsoever unless in start position.

I'm running into a brick wall, can't think of anything else to try and not as familiar as i should be with these things for the level of troubleshooting this is requiring.