Originally Posted by Shrew
By "Cross-over" switch I assume you mean the Battery Switch (1; 2; Both; OFF) and not the cross-over for the generator to power both sides of the VAC panel.
From your battery charger, follow the positive leads to the batteries. I assume you have a multi-bank charger with a charging leg connected to each battery/bank.
I don't have a 1,2 Both off. I have 3 "on/off" switches. one for the house batteries and one for each engine. On my electrical panel there is a "cross-over" switch that allows me to use house batteries to start engines if the start engine fails. Sounds like it might be the same thing.
My house batteries are 6- 6 volt tied together to give me 12 volts. the start battery is one big 12 volt battery. So my concern is am i doing any harm tying all together to receive a common charge at the dock from either the solar panels or shore power charger.