Ze - I guess you could technically use the battery cutoff switch to connect/disconnect the two batteries from each other. But it wouldn't be very convenient because you'd have to remember to manually switch it every time. If you forget, you could end up draining both batteries or not charging one of them. The dual battery isolator kits are basically a solenoid activated relay that is controlled by ignition switched power. So the batteries are connected when ignition is on, and isolated when ignition is off.
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