Boat battery

[BCinerie]

Capt-


Am I doing it wrong?? My thought process is when running is to charge and maintain both batteries and when I stop or troll turn switch to #1 or #2 just not the both setting so I isolate 1 of the batteries so if there is a electrical drain I still have 1 battery to start main motor?? . I run all my electrical components through the fuse box and that is hooked through the main switch. Nothing is direct wired to the batteries. SO am I good??


I also carry a 3d battery that is not hooked up to anyhting!! I duck hunt and in december and January there is not a soul around for help!!!!