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Installing a trailer wiring harness can often require cutting, splicing, and a heap of guesswork, but not with the T-One Vehicle Wiring Harness. This custom-fit harness plugs directly into your vehicle's factory tow package wiring, taking all the stress out of the process. Located just behind the rear bumper, it’s a straightforward plug-and-go solution suitable for a variety of models without altering your vehicle's original wiring.
Diverse trailer requirements call for versatile connectivity solutions. With the T-One’s 7-way, blade-style trailer connector, you can effortlessly power your trailer’s signal lights. It’s compatible with 4-pole, 5-pole, and even 6-pole adapters (sold separately), giving you the flexibility you need for a variety of towing scenarios.
Reliability is key for any towing component, and the T-One harness features durable 16-gauge bonded wire to ensure consistent performance and longevity. This robust construction helps the harness withstand the rigors of both regular and infrequent towing, providing you with confidence mile after mile.
The convenience of quick and easy connections is part of what makes the T-One harness standout. Just plug the included relays into the designated slots under your vehicle's hood and cargo area to quickly activate all the necessary trailer functions. It’s designed for those who prefer towing without hurdles.
Electrical connections are prone to corrosion, especially in harsh weather conditions. Using a small amount of grease on all the electrical connections, including the plugs and the 7-pole connector, can significantly reduce the risks of corrosion, ensuring reliable operation and extending the life of your connections.
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Worked great in my Nissan Pathfinder. Just need to buy a 7 pin connector bracket that attaches to my hitch or vehicle frame. I used zip ties for now
Wiring worked great with the trailer hitch also ordered from etrailer! I had some trouble getting the wiring hooked up though so I needed to bring it to the dealership. All worked out.
Working harness is great. It was very hard to plug in behind the tail light. The bracket attached to the tail gate is very rusted.
Very happy with my purchase of the 2013 Nissan Pathfinder trailer hitch, 7 pin wiring harness and bracket.The videos really speed up the installation, especially the internal vehicle disassembly and wiring. Everything went to plan with no surprises. The parts are well engineered and good quality. I printed out the 7 pin connector schematic and used a 12 volt test bulb to verify functionality. I didn't break any of the plastic clips or skin my knuckles, which is a first for me. I purchased an inexpensive panel clip tool set, which makes removing the plastic trim a breeze. A screwdriver would work fine, but I needed an excuse to buy some more tools.
I removed the blanking plugs from the external harness connectors before installing the hitch. It's easier to get at them. Don't pry the connectors off the body using a screwdriver. Use a pair of needle nose pliers on the reverse side of the clip to release them from the sheet metal.
Excellent web site and videos make it easy to select the right parts.
Love this company. I ordered on a Sunday at 3pm and it was shipped by george by 8pm. And I got it two days later. Could not ask for better service. And their videos showed step by step instructions. So super easy to do yourself. I had to remove the tow mount, and cut some plastic. But still easy. Thanks y'all. Great prices and service. Will be going here for all my vehicle needs. Next will be the roof rack.
Received my hitch, wiring harness and 7 way receiver adapter within a few days. The video was spot on. Asked Jon with etrailer a couple of questions and he responded almost immediately. Everything went smoothly except two hitch bolts wouldn't go into my Nissan. Used two of four bolts which held my tow harness in place which i removed and fixed the problem. I apparently ordered the wrong 7 way adapter plate so be careful which one you order but fixed the problem by drilling 3 new holes and it worked perfectly. Overall I'm very pleased.
Just installed on my 2013 Pathfinder and I have no complaints. The fitment is spot-on and installed very easy and quick. The exterior harness wasn't too long and was actually the perfect length for the mounting point for the 7- way plug. The only thing missing from this kit is the bracket to mount the 7-way plug. Aside from that this is a complete and comprehensive kit.
Quality product at reasonable price. Fast delivery and a quick email from the business to make sure everything was as promised. I have used this company before and will in the future.
Great product. The only thing thing to improve is to mention explicitly that the 7 pin connector mount bracket is not included with recommended wiring package or trailer hitch. Otherwise great product, easy to install and looks great.
Excellent product and fantastic service team!!! Great company.
The service ans support were great. The product fit perfectly.
It's nice to do business with a quality company. I will let all my friends know about eTrailer.
Easy to follow and Etrailer provides videos on how to install as well.
It works great in my Nissan Pathfinder 2018 after 1 year, I surely recommend this product
Saved more than half what it would have cost me at U-HAUL. Glad I had help and access to a lift.
Purchased :
T-one Vehicle Wiring Harness 7-way Connector
Grease Dielectric 2 Oz.
Draw-tite Max-frame Hitch Receiver - Custom - Class III -
Mounting Bracket For Pollak 7-pole Rv-style Connector
I ordered DrawTite hitch #76031 along with Tekonsha Wiring #118273 and HM40975, 7 and 4-Pole Trailer Connector Socket for my 2018 Nissan Pathfinder SL. I ordered on a Thursday afternoon and the merchandise arrived the following Monday evening (with free shipping and no tax). The hitch arrived in excellent condition with no scratches or scrapes and was packaged very well. The total for my order was a great price! This also included a tube of dielectric grease and a brush. To get a factory hitch would have required an expensive "Technology Package" at a cost of over $2000 or a dealer install which would have cost over $1000.
I did the install of the hitch myself. It would have been far easier if I had a lift to raise the vehicle off the ground, and a helper to hold the hitch in place and get the 6 frame bolts started. I used an ice chest to prop up one side of the hitch while I got the bolts started on the other side. Watch the videos from etrailer before doing the install. I did have to trim about one-eighth of an inch off the corner of the gasoline vapor recovery box on the left underside of the vehicle to get the hitch into a position so that the holes in the hitch lined up with the weld nuts on the frame. I used a rotary file on the end of my drill to do this. The 2X2 receiver does barely touch the bottom of the rear trim on my Pathfinder but did not require cutting the trim to get it to fit.
The Tekonsha #118273 Factory Wiring was not difficult to install. The etrailer video on how to install this item was not as good as it could have been. The installer says he is going to make the 2 vehicle connections inside the left-rear of the vehicle "by feel," which may be fine for someone who knows what he is doing, but was not helpful to me. I pulled back the trim on the inside left rear to make these 2 connections. You should definitely make ALL of your wiring connections BEFORE installing the hitch itself. If you don't, it will be very difficult to reach the connectors outside the right rear of the vehicle if the hitch is already in place. BE WARNED about this.
The HM40975 connector was very easy to install and by having it you will not need to use an adapter to use a 4-way flat trailer connector. I used 2 stainless steel bolts to fasten the bracket into place instead of the included self-tapping bolts that were in the kit. This item is well worth the small cost.
I am completely satisfied with my purchase from etrailer and will not hesitate to recommend them highly. Both George and Adam at Etrailer were very helpful.
See the picture of the completed install on my 2018 Nissan Pathfinder SL.
I received the product in a timely manner and it was ordered just before a holiday weekend as well! Everything was packaged well and all necessary instructions included. I was not a fan of the grade 5 hardware included to mount the hitch but there were enough factory bolts from removing a bracket to make the kit work. The online instructional videos are also great to look at before installing the product. It is self explanatory if you have any mechanical ability but, very helpful for those who dont.
I had zero issues installing the T-one harness into my car and although there isnt a video online for disassembling my particular vehicle. The other videos provided give you an idea as to what is involoved as well as the great instructions that are included with the harness!
I have had a hitch installed by a major chain and will never do that again as this twenty minute install was super easy, engineered well and has a great fit and finish! Thanks e trailer for the great product and one stop shop experience!!
Kyle K. 
7/6/2017
Still doing great after a year of solid use!
Great product and very affordable. The installation was quick and easy
The wiring harness I purchased for my 2016 Nissan Pathfinder for my towing hitch was very easy to install per their instructions and connected seamlessly with the wiring harness already on the vehicle. I am very pleased with this product and have referred them to several of my friends. I would definitely buy from them again.
David
4/12/2023
The harness is still working as it did when first installed. Would highly recommend this product.
I gave this kit to my mechanic and he informed me the product was thorough, parts identified clearly which made it an easy installation
I ordered the Draw-Tite Hitch #76031, along with the wiring harness for my 2014 Pathfinder. Julie H. made the ordering process easy. To my surprise, the installation went very smoothly. The video instructions online made the job simple. I have yet to use my new equipment. I look forward to our upcoming camping trip to try it all out.
Robert R.
4/11/2019
I am very happy happy with my purchase.
Fit my 2018 Nissan pathfinder perfectly. The video you provided was excellent. I have no problem pulling my 22ft wildwood FSX with my nissan thanks to your product.
Received parts in just a couple of days and installation was easy and straight forward installation on all tow hitch and electrical for brake controller components. Again etrailer comes thru with what i needed for the best price and parts.
Daryl G.
5/19/2020
The tekonsha brake controller works perfectly
The left turn signal and brake light didn't work on install. I still have to tear everything apart again to troubleshoot. Camper at storage. Takes an hour to get to relays behind panels and I just haven't bothered.
Sierra K.
6/6/2022
Check your vehicles owners manual to see where any fuses or relays are and test them to make sure they are working. If they are working grab a circuit tester like item # PTW2979 and test the connector and wires every foot or so, going into your harness on the vehicle side, after disconnecting it from your trailer. If it turns up okay then test the signals coming out of the harness. If those are correct then your issue lies within the trailer side. Check for corrosion build up which can interfere with signals. If you need to replace the plug you can use item # H20043. If you need to replace wiring you can use item # 16-1-1.
Helpful Links
Automotive-ToolsPerformance-ToolPTW2979.html
Everything with this wiring fit perfectly. After watching the video install it was a breeze finding the fasteners to remove the access areas. It has been a year since install and has worked without any issues. The only extra I needed was the bracket to the hitch for the female 7 pin plug. The one I ordered from e-trailer did the job and looks professional. Thank you e-trailer on another great product.
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Brooke M.
5/29/2025
Glad to hear that :) What are you going to be towing?