7 Pin Trailer Wiring Harness | etrailer Install a 7-way, RV-style trailer connector on your vehicle with this easy-to-splice harnessLite draws power directly from the battery to avoid overloading your vehicle's circuits. Brake. electrical system Includes harness with 4-pin connection point for plugging in a brake controller wiring adapter (sold separately) Supplies required fuses, wire taps, and additional hardware Trailer Wiring Diagrams | etrailer Trailer Wiring Diagrams. The round pin style is very rare. The RV style 7-way with flat pins (or blades) is very common. It is often found on newer trucks and SUVs that come equipped from the factory with Mounting Your Trailer Wiring Harness. Often the 4-pole trailer connector will remain in the trunk or cargo area of a car or SUV whenNissan Rogue · Best Accessories · Jeep Wrangler Unlimited · Honda CR-V · Ford F-250 Super Duty Amazon: 7 pin wiring harness Lavolta 7-Way Trailer Connector Plug Cord - 7-Pin Wiring Harness with Junction Box - 7 Blade Wire Cable for Truck Camper RV - Weatherproof and Corrosion Resistant Breakaway Kit - 4FT. 4.2 out of 5 stars 183. $19 $ 19. 99 $20 $20. Get it as soon as Tue, Jan 14.