Kent I had pretty much the same set up for years, and youre correct, the trailer lights wiring is too small to power a decent sized electric wench. I installed a deep cycle RV marine battery on the trailer near the wench n it worked fine. I kept it charged from the vehicle while driving via the plug n connectors AUXILIARY terminal which I had wired to my truck battery with 10 gauge wire and a 30 amp circuit breaker at the trucks battery.
Piece of cake n it works fine and anytime you drive youre charging the trailer battery. of course, I had the trailer battery inside one of those protective boat type batery boxes and I also used its power for my break away safety trailer electric brake system.
The breaker at the truck will trip out if you pull more then 30 amps back to the trailer and if I was gonna use the wench a lot Id unhook the trailers electrical plug to the truck so as not to run the truck battery down from prolonged heavy wench use. If you wanted to get fancy you could wire up a relay such that the trucks battery was only connected to the trailer when the truck was running to avoid and truck battery discharge problem but I simply unhooked it if I was gonna use the wench a lot.
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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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