When on shore power, always have the charger breaker turned on. It will charge batteries, regardless of what position your battery switch is in.
The battery selector, when the boat is nt in use should be in the off position. That said, it doesn't hurt to be in the 1 or 2 position. The both position is for emergency use only....as if you were to run both batteries low enough that they could not start the engines. You would put the switch to both to combine the batteries power to hopefully get you started.
_________________ Current Boat: 2004 Sea Ray 320 Sundancer "Nauti Luvin'"
Previous Boats: 1999 298 Vista "Seas The Day" 2008 H200SS "Nauti Luv" 2006 Tahoe Q4
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