Not the way to do it.
You start with [Power Posts] that you attach the cables from the engine to...... I typically shorten the Factory battery cables.
This puts better sealed ends on the cables and gets rid of bundeled up excessive cable.
Then from the Power Posts 2ga cable to the selector switch.....I dump the factory Perko style switches and install a BEP cluster..... I'm on my 39th BEP cluster install now. Then on to the batteries with the 2ga.
The power wire will be pulled back into the console and shortened. It then gets hooked to a Main breaker to handle All the house loads...Typically a 40amp unit. Then gets hooked to the House BEP switch.
Trolling Motor [TM] batteries are NOT in this equation......That is a separate system....That system will need it's own on board battery charger.