In the ON position, both the Engine/Starter-batt circuits are connected on the one hand, and Primary/House on the other.
In OFF, both of those two connections are opened/stopped respectively at the same time.
No connection between the two sides are made in either case, Primary/House is isolated from Starter/Engine on both Load and Bank sides.
Until you choose Combine, which closes/connects ALL FOUR circuits together - except I would have isolated one of the banks beforehand with its (bottom of diagram) 0/1 switch.
There's a very HD version of it too:
https://www.westmarine.com/buy/blue...rcuit-plus-battery-switches--P009_272_004_507
In OFF, both of those two connections are opened/stopped respectively at the same time.
No connection between the two sides are made in either case, Primary/House is isolated from Starter/Engine on both Load and Bank sides.
Until you choose Combine, which closes/connects ALL FOUR circuits together - except I would have isolated one of the banks beforehand with its (bottom of diagram) 0/1 switch.
There's a very HD version of it too:
https://www.westmarine.com/buy/blue...rcuit-plus-battery-switches--P009_272_004_507
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