Not getting any spark so convinced it blew a fuse and no I don’t know the serial number it’s faded away but if you can tell me where another serial number is I can try and find it
A lot of them have the serial number on a silver plug on the block.
Carb Mercs have an inline fuse on the solenoid wire (yellow/red),under the cowling. It only kills the starting circuit. I am not sure what an EFI motor has.