There is standard wiring information for 7 pole connectors. On the blade type connectors, the positions are the same, just the color of the wires vary between the Utility and RV standards. If your tow vehicle has a factory installed plug the function positions will be as shown. If installed aftermarket positions should be the same if done correctly. You will note there is one blade dedicated to power. I believe you will find the key has to be on to have power on the 12 volt power terminal of the truck connector. This would be used to charge the breakaway battery or other 12 volt needs on a trailer. That is the terminal you should get power for your winch battery from. And yes, a circuit breaker after the trailer junction box is a good idea.
If you plan on doing a lot of winching, you might want to run a separate circuit using at least 10 gauge power (+ and -) wires from the truck battery to the winch battery. This could be a 10 gauge extension cord with clips on the ends you can hook up when winching. That way you don't risk the truck and trailer wiring.
This post was edited by Jim.ME on 06/10/2022 at 03:24 am.
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