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Dealer install of winch, adding dual battery. What is the round solonoid(?) in first pic. Is this from alternator? Positive from (round) to main battery. Next, 2 red wires from main positive to 2 Grey 40A relays, do they stay on main pos or swing them to 2nd battery. Wanna run everything off 2nd battery. I’ve looked at numerous threads on this but pics work better.