Constant power to the truck? Do you mean it will be direct wired to truck battery? If so, keep in mind that if the trailer battery has a problem or gets real low then the winch is going to try to draw power through the wiring to the truck. Electric winches of that size can draw 300-400+ Amps. The same thing can happen the other way too. If direct wired and there is a problem with the truck battery then the truck will try to draw its power off the trailer battery.
I've seen this happen both ways and melt wiring and cause fires. You either want an battery isolator for the trailer, a trailer battery charger for winch battery or very heavy gauge wiring going to the truck battery with a huge circuit breaker in case the winch or leads short out
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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