MercedesS500.jl

Hello I have a W220 that refuses to crank, are there any ideas why this would be happening?

ibeforreal

How old is your battery? Does the key turn in the ignition? What happens when you turn the key?

MercedesS500.jl

Fresh Brand New Battery, Key turns all the way and everything turns on as it's supposed to even when I turn to crank everything acts normal but not one sound from the Engine or starter, starter is brand new, did crank once but slower than usual not enough to start it

wallyp

Any faulty connection in the main positive cable or any of the several negative cable connections can cause this.
So can a faulty starter or starter solenoid, or a faulty starter relay, or a problem in the shifter so that the system doesn't see a neutral safety start switch connection.

Hands-on inspection and testing is the only way to find the problem.

tusabes

I bet the fuse under passenger floor is corroded

Ikande

I have the same issue, except if I move the shifter from park to reverse and back it starts . I’m thinking neutral safety switch. Any thoughts?

wallyp

Sounds likely - but the only way to find out is still to take it apart and inspect it closely.

Ikande

I've taken shifter apart and changed the plastic locking lever for an aluminum one. New starter relay, Where is the Neutral SS located exactly? Should I just grab a new starter. Battery shows full charge and alternator is charging.