I have dual batteries in the console (CC boat). I don't have any pics right now but it's as follows.
Batteries mounted in console
4 way switch mounted in the cubby under the steering wheel
1 AWG running from engine to switch
1 AWG from batteries to switch
Power from the switch common to my fuse panel
Ground from the battery to fuse panel
The cranking battery is on the 1 position, deep cycle on 2, they both run an a parallel on the both position.
I run in the "both" position and switch to the deep cycle when at anchor.
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