7 Pin Trailer Wiring Harness | etrailer Quickly and easily install a 7-way, RV-style trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping) Connects quickly and easily - no cutting or splicing of wires Locate 12-pin wiring harness behind passenger's-side kick panel and insert harness with relays Locate factory harness connection point behind Amazon: 7 wire trailer wiring harness Primelux 10ft 7-way Trailer Cord with Junction Box - 7-Pin Trailer Connector Plug Wiring Harness - 7 Blade Copper Wire Cable for RVs, Campers, Trailers, Towing Vehicles (10ft with Junction Box) 4.6 out of 5 stars 2. $39 $ 39. 95. Get it as soon as Tue, Sep 24. FREE Shipping by Amazon.