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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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