DPDT Switch for Battery Bank

In the first gentleman's reply he had a diagram showing the 6V battery banks were grounded. In my case the 12V tongue battery (both + and - ve) wires go to the connectors on the 12V power panel. I was going to cut the wires and add two wires from the 6V battery bank all terminating at the switch. Seemed to be the most easy thing to do. My trailer does not use a ground -ve except I believe for the brakeaway switch as the terminals exit from the battery box. The switch is right there on the tongue. Thanks again. Thought using two off/on battery switches from blue seas would work.

Use the battery switch on the positive. No reason for DPDT to switch the negative side.

I use these BLUE SEA multi-position sealed high current battery switches. There are many marine qualified similar units out there but this is the one I have used over the years...

Mine is a four position high current selector switch. (OFF-BAT1-BOTH-BAT2)
The big reason i selected this switch is being sealed and also has MAKE BEFORE BREAK switch contacts inside to prevent internal switch arcing under load.

I don't use these for any solar application but here is my general setup on using three of these switches with four GP24 batteries. Gives me two banks of two each batteries where i can switch to one or all four depending on what I want to do at the moment.







These are a couple of drawing using two or four 6VDC batteries in series using these switches...




Might give you some ideas on your application... I have never looked for 2P2T such high current switches before from BLUE SEA products...
Roy ken