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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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