Starboard engine won’t start on battery 1

[Twomblytra]

Hi all,

I have a 2000 3300 SCR. My starboard engine won’t start on Battery 1. I don’t get anything - no oil pressure alarm or anything.

Port side engine starts on Battery 1. All electronics including the blower motor seem to be running on Battery 1. I tested the battery and it’s good for charge and cranking power. Starboard engine starts right up on Battery 2 and Both.

Am I missing a fuse or breaker somewhere that controls this? Any other ideas?

Thanks for your help.