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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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