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Not sure about the guage of the wire, I would take the above advice on that. I would eliminate the battery switch since you already have circuit protection at the fuse box. A good starting battery has plenty of power for what you want, so I would avoid the "Combo" deep cycle/starting battery and just run a good "Starting" battery. I also put in a power recepticle (cigarette lighter) outlet in my boat thinking that it would be "Invaluable", yet I've never used it. Real Estate is at a "Premium" on our smaller model Whalers, so you only want to take along what is absolutely neccessary. Welcome aboard "Whaler Central" !