I believe what you are referring to as a battery isolator is in most diesel equipped trucks that have two batteries under the hood . one for starting and the other for lighting system.
a trailer that would be often taken off tow vehicle would only charge when traveling when you unplugged the connection between the tow vehicle and trailer it would be isolated.
Starting the tow vehicle wouldn't have much effect on the winch battery, at least not enough to worry about.
The wiring diagram is good for any trailer that has that same plug and if you hooked up backup lights even if you picked up one that didn't hav B/U lights it would still work without a problem.
You can even get a 4 wire Flat plug adapter for like a boat trailer, or utility trailer and your same plug will work.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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