(Source: Victron PDF file)
As I understand this correctly, the main switch 3 will disconnect the starter battery from the rest of the installation, but it will leave the starter motor, alternator etc. connected tot the Orion TR. I'm confused, why would you want that? To me it seems to make more sense to only disconnect the plus going to the Orion and leave the starter motor / starter battery configuration as is.
Can someone please explain this switch configuration?