Hi Russ,
That solenoid requires 12V on the primary wiring to activate it. If one of your battery banks is dead there would be no 12V to activate. When you flip the switch one way it uses your house batts to activate it. When you flip the opposite way it uses the engine batts to activate the solenoid. The batts are not merged in the center position.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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