I am a new owner of an 87 Mariner 32 (3297). I'm in Toronto (out of water 6 months a year). I have read the manuals and read what I can on forums and I am still confused about what settings the switches should be on when charging (on shore) and when on the water. It would appear that carver says that shore power should via one bank of power at a time not both. I really don't understand if I should be on both when at shore, with shore power switch on and inverter off, then only inverter turned on the water to either battery bank one or two. Does the switches for 1-2-none-both matter when I am connected to shore power and not on the boat? There is little reference in the manuals as to which switch setting you should be on in different scenarios.