7,6,4 Way Wiring Diagrams | Heavy Haulers RV Resource Guide 7,6,4 Way Wiring Diagrams 8/1/2015 7 Way Wiring Diagrams: There are two wiring codes for different types of 7-pole plug and socket sets. Most RV's use the RV wiring code for the type plug/socket that has 6 flat contacts surrounding a center round pin. Wiring Diagram for a 7-Way Round Pin Trailer Connector on I do have a handy trailer wiring FAQ article that would be perfect for you. I have included a link to it. I have also included a picture that shows the typical wiring diagram of a 4.9/5(140)Brand: Deka How To Replace Your 7 Way Trailer Plug - YouTube Click to view on Bing5:53How to diagnose and FIX trailer light issues FAST! Demonstrated using the Power Probe 3 tester - Duration: 13:12. Shane Conley 213,965 viewsAuthor: Gregory GallagherViews: 135K Trailer Wiring Diagram For 4 Way, 5 Way, 6 Way and 7 Way 6 Way Systems, Round Plug. Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM.
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