HarryTitus Posted July 12, 2019 Share Posted July 12, 2019 (edited) Gentlemen, 2017 Ford F250 Superduty. I am in the process of wiring in an electric winch on my trailer. The deep cycle battery required would need to be charges as we drive. I know the 7 pin jack has a 12+ and a negative. Connecting up a pigtail to connect to these is easy enough, but what about the fuse and relay. The owners manual says a relay goes in slot 37 and a 30 amp fuse goes in slot 27. However, it does not say the specs for the relay. Also, reading another forum, a guy says there is no need for these because the computer will recognize the trailer and automatically power up the 12+. That's why no relay type is specified. What's the deal? Any ideas? Thanks! Harry Edited July 12, 2019 by HarryTitus spelling Quote Link to comment Share on other sites More sharing options...
akirby Posted July 12, 2019 Share Posted July 12, 2019 If you have a factory Trailer brake controller you don’t need the relay and fuse. It will activate power when a trailer is connected and the brake pedal is engaged. Quote Link to comment Share on other sites More sharing options...
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