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 - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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