Not really sure what that is, not the usual SMB istalltion. It looks more like a hard switch to me, if you have a part number or something, maybe we can find out.
Most early (pre-2004) SMB were installed with a diode based isolator, after that they moved to "separator" Sure Power and then on top a Blue Sea ACR (automatic charging relay).
It is possible that this is a bypass switch for one of the above. You can monitor your voltage on both batteries and see what each setting does, this would be best done when you have a charge voltage present so that you could see the voltage difference.
-greg
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-greg
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"Goldilocks" 2020 Ford Transit High Roof Extended 3.5 EcoBoost AWD Homebuilt
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