I would not bother with that N/O between the trailer battery and the winch. There would be a high amperage draw across it and really no reason I can think of to break it. You would just want the N/C contact between the trailer and vehicle to open when the winch was running to eliminate draw on that line. That way the relay would only have to be heavy enough to handle the charging current. I would have to see how the winch was wired to recommend where to pull power off of it to energize the isolation relay but when it was energized would be the only time you would need break the connection.
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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