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"House and Generator Battery switches are Blue Sea Systems On-Off Operable.
Engine battery switches are Marine Electric Battery Switches with a Voltage Sensitive Relay Module for emergency starting. Operable."
Does the 12 volt meter in the lower right of photo measure only house battery voltage (the most important for what I want to know), or does it measure any combination of all 4 batteries, which would depend on knowing the combination of switches on or off at any given time (useful to know)?