Little late for this thread ..... but on my farm, and my Bay Boat - I have switched to solar, to charge my batteries.
On each battery, I have installed the female cigarette lighter plug. On my solar panel, my lead is 12 ft long with the male end. So my boat(s), generators, fuel tank, mowers, etc - all have female plugs attached to them. I rotate them as needed. The solar comes with a overload protector. I have the same set up on my boat lift for my big boat.
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I clipped the ends on the factory connectors, and add these soilder ring connectors. I use these on 100% of my 12 v. connections.
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