Nissan Frontier Trailer Wiring | etrailer Tekonsha T-One Vehicle Wiring Harness Installation - 2018 Nissan Frontier. Today on our 2018 Nissan Frontier, we're going to be taking a look at and showing you how to install the Tekonsha T-One vehicle wiring harness with 7-way trailer connector. Amazon: nissan frontier trailer wiring harness Amazon's Choice for nissan frontier trailer wiring harness. CURT 56226 Vehicle-Side Custom RV Blade 7-Pin Trailer Wiring Harness for Select Nissan Frontier, Pathfinder, Xterra, Suzuki Equator. 4.0 out of 5 stars 28. $77 $ 77. 07. Get it as soon as Fri, Aug 9. Only 14 left in stock - order soon.