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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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