I don't know how the other makes are set up but the Ford trailer tow charging wire is run through a fuse that feeds a relay that supplies the charge circuit at the plug. This circuit is only live with vehicle key on so if you shut the truck off while running the winch you shouldn't be able to damage anything on truck as the relay opens the circuit when the key is off. I would assume all makes similar , shut truck off seems easier , you aren't going to recharge the batteries in the few minutes you are running winch, they will charge on the way there and back while driving. Maybe if you are using winch a lot with limited driving having some kind of a battery charger on the trailer while parked would be a better long term fix. Your system would no doubt work but reminds me of the automakers efforts to make things more complicated than they sometimes need to be . But I just like to keep stuff as simple as possible.
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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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