Price: $39.32

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118525

lowest price pledge


Our Price: $39.32

Orders above $50 qualify for Free Shipping

Select Ground or 3 Day Shipping for delivery before Christmas


In Stock
zoom in icon
zoom out icon
pop out icon replay 360 icon
horizontal rotate icon

  • Custom Fit
  • Trailer Hitch Wiring
  • Tekonsha
  • 4 Flat
  • No Converter
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118525 or order online at Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.

Tekonsha Custom Fit Vehicle Wiring - 118525

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection point along frame rail
    • Plug in connector
  • Includes required relays to activate functions
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located beneath the rear of the vehicle, along the driver's-side frame rail. Once you've plugged in the tow harness, connect the included jumper harness with relays to activate functions. This harness plugs into the 12-pin plug that is located behind the passenger's-side kick panel in your cab.

Once installation is complete, the 4-way flat connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

118525 Tow Ready T-1 T-Connector - 4 Wire

118525 Installation InstructionsInstallation Details 118525 Installation instructions

This Product Fits The Following Vehicles

2009 - 2012 Suzuki Equator

2005 - 2018 Nissan Frontier

2005 - 2015 Nissan Xterra

2009 - 2012 Suzuki Equator without factory trailer connector

2005 - 2018 Nissan Frontier without factory trailer connector

2005 - 2012 Nissan Pathfinder without factory trailer connector

2005 - 2015 Nissan Xterra without factory trailer connector

Related Products

Customers Who Purchased This Custom Fit Vehicle Wiring Also Bought...

Replacement parts available for this product

Video of T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Tow Ready Custom Fit Vehicle Wiring 118525 Review

Today we're going to review part number 118525. This is the Tow Ready T-One Vehicle Wiring Harness with 4-way flat trailer connector. This is a custom fit part number. Is designed to fit the Nissan Frontier, the Pathfinder, and the Xterra, starting in 2005, and the Suzuki Equator, starting in 2009. It includes everything shown here on the table. It includes the jumper harness, the tow-plug harness, 3 relays, some cable ties, some foam tape, and some nice detailed instructions. This will provide a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights. It does connect quickly and easily.

It's all plug-in connectors. There's no cutting or splicing of wires. Basically, there's connection points you'll locate on your vehicle. It does include the required relays to activate all of the functions. On the 4-way, it's constructed of this 16-gauge bonded wire.

You'll also note that it includes this nice rubber dust cap, that when you're not using the 4-way you can just pop right over to protect the terminals from any damage or from the elements. Specs on this harness, the max amperage is 7.5 amps per circuit. Basically, the way this would install, what you'd do is go on your vehicle and where you'd connect the tow-plug harness to, there's a location point beneath the rear of the vehicle along the driver's side frame rail. Basically, you would just plug this . There will be a connector that will match to this. You just plug this in, and this will be at the back. This jumper harness, what you have to do there is it has .. This is located in the passenger-side kick panel, usually in the cab of the vehicle.

You'll find a connector that will match this one right here. Once you plug that in, then you'll have these three connectors. This is where the relay is. You would plug this one in just like that, then these other two you would line up and they would plug in just like that. Put them on this way, and then this one over here.

That will activate all the functions on your towing package. Then you'll have some zip ties or cable ties that will allow you take up any excess slack of the wire. Again, we did mention it has a nice set of detailed instructions. You can see pictures of where your location points are. This foam tape, with the tape sticky back on it, basically what that's used for is once this is installed in your kick panel and your relays are in here, you don't want this bouncing around. They give you some foam tape to put around it to protect so it doesn't rattle around in the vehicle. That should do it for the review on part number 118525. This is the Tow Ready T-One Vehicle Wiring Harness with the 4-way flat trailer connector. .

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118525

Average Customer Rating:  4.9 out of 5 stars   (409 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required.

- 118525

by: Nelson M09/09/2014

just got my wiring harness yesterday was easy to install just like the video they have posted on their website really easy took me about 15 minutes to install had no issues installing 150427


Good have had no issues

Nelson M - 09/15/2015


- 118525

by: Dick J.04/29/2012

My eTrailer purchase experience has been fantastic! Quality products, low prices, fast shipping, and great instructional videos. The Curt Trailer Hitch (#13514) is definitely a high quality product; I installed it on my 2012 Nissan Xterra PRO-4X. The fit was definitely tight. Not only did I have to remove the rear exhaust hanger per the instructions, I had to remove the mid-hanger just behind the muffler and loosen the hanger just in front on the muffler to get the required clearance. After that it just needed some friendly persuasion; i.e. a hammer. The hitch fits well, looks great, and only took about an hour to install with my 15 year old son. The T-One Vehicle Wiring Harness with Relays (#118525) could not have been easier! I was only cautious of removing the passenger side floor sill and kick panel without a panel puller. Just took my time and didn't rush; panel puller really not required. Had the Xterra wired in 20 minutes. GREAT EXPERIENCE WITH eTrailer! They have gained a repeat customer!!! 38756

- 118525

by: Ryan C.05/19/2014

I had previously bought a rear wiring harness from another vendor and wondered why my running lights did not work. After seeing's video and information about my Xterra I realized I needed the front harness and relays. I ordered the kit here and it was a snap to install after watching their video. I am happy to say that now all of my trailer lighting works perfectly. Shipping was fast too. This is a great website with all of the information you need. I will definitely come back for any future towing needs. 131384


Wiring and relays all still working flawlessly. We are getting ready to take our trailer on a road trip and I am confident that everything will be working as required.

Ryan C - 05/19/2015


- 118525

by: Igor G.02/26/2012

This is a good product overall - I just installed it on my 2009 XTerra SE and it works. Since there is no moving parts I do not believe it is likely to break. However there are 3 minor issues with it: 1. Instructions could be improved. Just like Pete mentioned in his review, it was confusing for me at first, since I do not have much practical experience. It ended up to be simpler that I thought really. At first I thought that there should be 2 or more connectors to plug it in and I was breaking my head trying to find it. It took me some time to realize that I really just need to plug in connectors to the harness and then connect harness to the adapter on the car body. Once I realized it took no time at all to put it all together. 2. I am not sure if this is due to some code requirements, but I would make harness ends shorter in order to fit it better behind the panel. 3. Plastic strips that came in the package could be longer to allow to be attached to my hitch receiver. Overall it is a good product and I would recommend it to a friend. 32564

- 118525

by: Charlie A.06/06/2015

Bought a used 2012 Nissan Frontier with a U-Haul trailer light converter kit. The truck lights and the trailer lights were totally screwed. Ordered the T-One Vehicle Wiring Harness (118525) and saved the day. Took longer to repair the truck's wiring harness that U-Haul screwed up, than to install the T-One harness. Best part had it shipped the cheapest way, got the part in 1 1/2 days. GREAT JOB ETRAILER ps live in a large metropolitan area and could not find this part anywhere 201164


no problems

Charlie A - 06/05/2016


- 118525

by: Ralph M.04/10/2012

I am extremely pleased with the product. I got the T-One Vehicle Wiring Harness with Relays, #118525, way sooner than expected and had it installed within 5 minutes. You just plug in the 12 pin connector to the already existing 12 pin plug located behind the passengers kick panel, secure it with zip ties, snap on the relays to the other end of the 12 pin connector, place the supplied foam pieces behind the wiring harness, zip tie the rest and you are done. The foam pieces will assist in keeping anything from rattling; may not be necessary if you use the zip ties properly but the foam is there, why not use it. The instructions mention using a test prob to make sure the wires are correct. I just hooked my trailer up to the green wire bundle trailer plug, which came with the kit, to make sure everything was correct. The prob wasn't really necessary. From my point of view, nothing can go wrong; it was too straight forward. 36777

- 118525

by: Ken F.07/04/2014

Installed it this morning..Took about 10 minutes for the inside harness..That's all I needed as I had already installed the hitch connector and found out that wasn't all I needed..The fact that you present videos on the install of your products makes things go very smoothly and is greatly appreciated..Thanks Much !!!....Ken 139285


Still works fine, Lasts a long time. Thanks again....Ken

Ken F - 07/04/2015


- 118525

by: kenneth s.05/09/2017

This product is perfect for my Nissan 4X4. Bolt holes lined up perfectly,it was easy to install. That is, after getting in the dirt, much more fun than on a lift! The hardest part, was getting the receiver up on jackstands and positioning over the holes and fairly tight against the frame. Second problem was getting the plug for the wiring to come loose from the connector ( not having done it before ). On my truck, I zip tied the wiring a little differently than the instructions showed. I wanted it entirely up and out of the way of any brush and mud that might pass under the truck. I've installed several hitches over my lifetime. This one is by far and beyond the easiest ( even in the dirt ) I've ever done. Thanks etrailer for one that works as described!!!! :) Pictures won't post? either computer is full or broken. :( 378337

- 118525

by: Jaime N.12/12/2013

Installation was a breeze. I watched the video before doing anything. Great information. Followed the steps in the video and had no problems. After installation, I used a cheap circuit tester to see if my running lights (brown wire) on the 4-pole flat connector were now operational. Success! Everything works great. I had no running lights before installing this harness and the 3 included relays. My turn signals and braking lights worked, but not the running/tail lights on my boat trailer. I've been doing business with eTrailer for a few years now. They've got the best customer service, shipping times, and prices period. A big thank you goes out to the staff at eTrailer. Thank you for the fast, 2-day shipping and all-round excellent service. Vehicle info: 2008 Nissan Xterra SE 2WD Curt Hitch (from eTrailer) 110031

- 118525

by: Joshua Richards09/24/2015

I received my wiring harness quickly after ordering. I was contacted by etrailer when ordering due to my shipping and billing address not matching. I'm glad they took the time to verify. 227463


Over the last year I havent used it very much. When I need it, its there. I have no complaints or issues with my harness. It was a good buy

Joshua R - 09/23/2016


- 118525

by: Bob M06/21/2017

I ordered a Curt trailer hitch and wiring kit for my new Nissan Frontier on Saturday and it arrived the following Tuesday afternoon, well packaged and ahead of schedule. I am 71 years old and was able to mount the hitch and complete the wiring in less than 40 minutes (I did watch utube videos ahead of time to see the steps involved). Everything fit perfectly and the hitch looks great--total cost was less than $200 for both hitch and wiring kit. The dealer wanted $750 to install a hitch (I don't knowif that included the wiring--I didn't ask. The only unorthadox thing I had to do was prop one side of the hitch on a heavy-duty box near where it was to be bolted on while I lifted the other side into place to start the first bolt. I am verypleased with both the products and etrailers--THANKS! 399265

- 118525

by: Jeremy W.09/26/2013

This product is exactly what I needed to wire a 2010 Nissan Frontier XE 4-Cyl without a tow package. I installed as specified in the instructions and video and had working trailer lights within 1 hour. This is my 3rd order from and each time the experience was impressive. My latest order was processed and shipped in LESS THAN 2 HOURS!! Even after placing the order at 6:42PM Pacific. That kind of record breaking customer service is borderline ridiculous. I make a living dealing with internet marketing, sales, and service and is beyond anything I have ever seen. Their easy to use and helpful resources saved me hundreds on my towing needs by doing it myself. Thanks!! 101563

- 118525

by: Carl B12/08/2014

Product works as described. Video of installation helped a bunch!!!! Easy to install. Will purchase items more from e.trailer. 163714


Still working as designed. I expected nothing less. Great product. Thanks a bunch!!!

Carl B - 12/08/2015


- 118525

by: Chris H.11/24/2015

Arrived in factory packaging. Watched the video that etrailer put together. It was a very simple install and now my trailer lights work. 232504


I use my trailer daily and have had no issues with this product.

Chris H - 11/26/2016


- 118525

by: Jm09/26/2014

I have no complaints it seems to work as desired my only gripe is the instructions could make it a little clearer on what plug you're using. But once you figure it out it's very simple to do Nissan does a great job of hiding the plug you really need deep inside that kickplate area but the trailer wiring kit worked well. My advice would be take it apart and just remember if you don't see the plug it's probably hidden but don't unplug anything that's already plugged in in that area even though the plugs would match in theroy to the trailer kit total install time for me was about 10 minutes after figuring out that that plug was tucked behind things. My only suggestion would be bigger zip ties 153226

- 118525

by: Nelson B.01/27/2013

The only issue I had was that I waited 3-1/2 weeks for the hitch to arrive, as etrailer had to wait for a shipment from the manufacturer. The folks at etrailer notified me about this immediatly and offered another brand of hitch which was in stock. Since I was in no hurry and the fact that I personally liked the design of the Draw-Tite better, I opted to wait. The hitch finally arrived last Thursday and I installed it on my 2011 Nissan Frontier after work Friday. Installation of both the hitch and the wiring harness was very straight forward and easy. This hitch was definately worth the wait. The folks at etrailer kept me informed of the progress during the entire process. GREAT PRODUCT. 303463

- 118525

by: Bill T.09/24/2015

Product arrived as described. Had one problem with the wires coming loose from the terminal when I pushed in the relay. After a little MacGyvering got it back together,works fine. 227448



Bill T - 09/23/2016


- 118525

by: Jim A06/03/2014

Install Video was very helpful. Product was easy to install and worked as described. 133959


After a year the product is still working as expected. No complaints!

Jim A - 06/03/2015


- 118525

by: Nathaniel in santa fe10/22/2012

Super easy. instructions come in the package and everything snapped into place. 57902


20-30 min and I had it on my truck running.

barney14 - 04/22/2014


- 118525

by: Steve03/09/2013

At first this might look too involved for the average person to install, but it's really user friendly. The harness with the relays is easy to put in & pretty much foolproof. Removing the sill plate & kick panel is not hard at all and you don't need a trim panel removal tool to do it either. Just use a fairly wide flat bladed screwdriver & use a little care and the panels come off easily. etrailer offers a short online video showing the installation that is much better than the instructions that come with the kit so a few minutes spent looking at that will answer just about any question you might have.. 69792

- 118525

by: Thad09/12/2014

This was extremely easy to install on my 2010 xterra, taking only a few minutes. It works perfectly. 150833



Thad - 09/13/2015


- 118525

by: B Sasic04/08/2016

Excellent product! Had it installed in about 15-20 minutes. I like the fact that etrailer included everything that was needed -- even adhesive-backed foam -- to prevent rattles of the components!! My only suggestion would be to include some split wire loom so that the 4-pin connector wires can be protected from under the vehicle. It just makes the installation look cleaner. I tested the installation with a multi -meter, and everything works as expected. This is so much better, easier, and professional that the universal kits that you have to splice into the tail lights!! 243383

- 118525

by: Steve H.12/29/2013

Harness installed exactly as instructions read. 111443


Perfect - no issues

Steve H - 01/01/2015


- 118525

by: Dave B.06/11/2012

2009 Xterra 2 wheel drive. Installation time 20 minutes. Most difficult step was removing the factory cap on the plug underneath the vehicle at the rear. Slide the plug rearward to detach it from the frame for easier handling. Also, pop the floor sill UP using a trim panel puller (putty knife), starting at the rear end. Raise the floor sill about 2-3" to clear the alignment stems then pull rearward to detach from the front door post. I broke one of the stems by not raising high enough before I pulled it loose. Otherwise an extremely easy install. 43728

- 118525

by: David.C.08/25/2016

After installing the wiring harness in my 2015 Nissan Frontier SV 4x4, which took about 10 minutes all together it has worked each and every time without any issues. I live on a dirt/gravel road and the dust is terrible during the summer but the cover for the connector keeps the dust out and the connector clean. I pull a trailer for a ZTurn lawn mower so it gets a lot of use and I would definitely recommend the harness. Also Etrailer customer support was great at knowing what I needed with my vague description and quickly got it out to me. 287623

- 118525

by: Larry10/05/2012

I was a little apprehensive about tearing panels out of my truck that is barely a week old. After watching the installation video a couple times I was ready. It was actually a lot easier that I thought it would be. And yes, the 12 pin connector was buried. I put the relays in and wrapped them in foam while at the kitchen table reviewing the video. It took longer to get the factory cap off the wiring in the rear of the truck than it took to do the wiring in the cab. Just finished and haven't hooked up a trailer yet but expect no problems. 56459

- 118525

by: Kevin S08/01/2015

Great customer service. Wiring was delivered in 3 days and was emailed about progress every step of the way. Installation was a breeze thanks to Etrailer video.? Had a little trouble finding the connection but as I've read in other reviews it's in there. It really a matter of plugging in two connectors one in front and one near real axle...might be wise to buy a couple of longer tie straps to assist adhering the wires to the frame. This is as simple as it gets "if I can do it you can do it " Would certainly use Etrailer again. 216068

- 118525

by: jeni m08/21/2012

Ordered T-One trailer connector arrived in a couple of days. It took less than 15 minutes to install on 2009 Nissan Frontier. It was a very quick plug and play installation and worked flawlessly on my trailer which we took on a week long trip. I only use etrailer for all my towing needs they have great products that always have install videos to guide you thru installation along with great prices and fast shipping. I have used etrailer 3-4 times and I am extremely satisfied. Thank You to the etrailer staff 52528

- 118525

by: J.Robbin H.01/26/2017

Forget those cobbled together wiring systems with that unreliable converter box and 3M connectors.My Nissan Frontier had one that was no good.Thanks to etrailer ,I got the real deal,factory type package that WORKS.I found the videos very helpful,especially in finding the 12 wire relay hookup(mine was tucked under and buried under the backside of the wiring box,under that gray tape).I have made two orders from etrailer,and am quite pleased with both transactions.VERY HAPPY,THANK YOU ETRAILER !!! 335674

- 118525

by: James M.09/24/2012

I'm really not handy and I just bought my car a couple weeks ago (my first in 12 years). I had no idea what I needed or how to install it but I really didn't want to pay the dealership hundreds of dollars for something I could do for about 1/4th the cost myself. I called e trailer and they explained the options I had for my SUV. They also had videos of how to install the part on the website which made is so easy that even I was able to do it. The price was right and it works great. 55681

- 118525

by: Sam H.06/29/2012

I ordered the towing wiring harness for my 2010 nissan frontier, which did not have the factory towing package. Several other places tried to sell me the wrong harness without the relays, but when I got in touch with etrailer they sent me the correct harness which took me about 30 minutes to install and was very simple to do with the easy to follow instructions and the price was very reasonable. I would highly reccomend etrailer for all your towing needs the Know their business. Sam H. 46226

- 118525

by: Frank D06/14/2017

I'm writing from Canada. I ordered the Curt receiver trailer hitch, and customized wiring harness. Although it took a while to get here, the product was exactly as specified, installed quickly with good instructions. One word of advice, use at hoist to install the hitch, laying on the garage floor and tightening the bolts to specs. just about did me in, maybe I'm getting to old. The wiring harness was a breeze to put in with excellent instructions. Good product and service. 396546

- 118525

by: Ken B04/29/2017

Needed to get my truck ready ASAP to haul a trailer, and was not sure what I needed. Went to a local retailer and they sold me something I didn't need. Found " on line after doing a GOOGLE search. The vehicle search selection was great and took me to exactly what I needed. The video's they have on line were on the spot. Showed me exactly what I needed and were and how to install it. Arrived right on time. Everything work great. Great experience. 374224

- 118525

by: Holly04/16/2013

After much research, it was your website that helped me to purchase the correct wiring harness for my Nissan Xterra. It was so easy to install that I had my doubts it would work, especialy since I do not have factory parts for a hitch/wiring. The directions were precise and easy to understand. It only took 15 mins to install, and that was only to find the connectors. Plug it in and go! I am very pleased and would recommed purchasing from Etrailer to anyone. 76287

- 118525

by: Adam C.02/16/2016

Very simple to install, just be careful when removing any plastic trim to not break any of it. Once you locate the connector behind the passenger kick plate, which might be hidden, you're home free. Plug the relays into the pigtail and the pigtail into the connector, tuck the pigtail and relays behind the existing wiring, replace the kick plate and trim, then install the trailer wiring into the connector on the frame behind the bumper. You're done! 237928


Im pleased to report that Ive had no issues with either item. However, I may have to upgrade to a 7-pin connector kit and get an electric brake controller. Should the time come for that, I know I can get them both from you fine folks.Thanks for checking in!

Adam C - 03/12/2017


- 118525

by: Sean04/08/2017

This is just install review, as I have. It used the product for any longer than a day. But get a 5 star review for install ease. Easiest install of trailer wiring out there. Other kits require splicing into existing wire. This simply plugs right into the vehicle. Does not take long to install. However, take your time when removing the inside panels so you don't snap a clip. Connection is solid. Lights work very well on my utility trailer. 364492

- 118525

by: Joe Russo07/19/2013

The installation of the T-One Vehicle Wiring Harness was super fast and easy. It took a total of 10 minutes to install the T-One Vehicle Wiring Harness as well as the flat 4-ple connector. The connector and harness worked the first time and my trailer lights operate correctly. I would recommend this product to any Nissan Frontire owner needing a properly installed 4-pole flat connector for their trailer lighting. A+ Rating in my book. 90468

- 118525

by: Erik08/14/2014

When I first looked at the wiring harness kit, I was a little intimidated. I started reading the instructions and quickly decided that the etrailer website was a better route to go. Sure enough, there was a video showing me exactly what I needed to do. Everything on the car was exactly where the video said it should be. The whole thing went together real easy. I was very happy with this product as well as how quickly it arrived. 146791

- 118525

by: Dave L07/22/2014

Wow! I've seen this kits avail for the last few years. Worth every penny. If you have ever installed trailer wiring it's a pain laying on your back with a test light. Literally 10min job. Harness plugs in inside the cab on the passenger side under the front kick-panel. Relays plug in to the same harness. Trailer end plugs into a factory plug at the bumper end of the truck. Clean, no fuss, excellent quality wires and connectors. 142567

- 118525

by: Roy Lamphere08/22/2014

Received the wiring harness the other day and put it on today. I watched the video first and it looked like a simple installation. They didn't lie, it was a real easy task. The only thing I forgot to order is the mounting bracket (18144). I'll probably live without it until I need something else from E-Trailer as the shipping would be more then the item. Thanks again for a great product and excellent service. 148076

- 118525

by: no name04/20/2013

the nissan xterra is semi prewired so this is really easy for anyone to do. the relay harness in the right front kick panel took 5 minutes to install and the short extension under the rear left only took another 10 to install and dress to the back bumper. I also purchased the mounting bracket for the 4 pole flat connector p/n 18144. it keeps the wires away from the hitch and makes the install look clean. 77002

- 118525

by: Dan N.07/01/2014

Installed the T-One wiring harness,118525,on my 2011 Nissan Xterra PRO-4X in less than 15 minutes. Used this to replace a Uhaul powered tail light convertor that had went bad 4 times in the last year ruining one trip and almost ruining another. Now when I hook up my trailer I no longer have to hold my breath wondering when the trailer lights will quit working. Thanks etrailer and good riddance Uhaul. 138600

- 118525

by: Sabina07/28/2012

Tight fit, took quite a bit of my husbands and his buddy's man power to squeeze it in. Good to know that it wont be coming off anytime soon but it would have taken a lot less time and had been easier to have just slipped right in and been able to attach the bolts. Besides that, The product looks way nice and it is getting tested out today by pulling our four-wheelers up the mountain. Thanks Etrailer! 49653

- 118525

by: Chuck H.01/13/2014

Exact same kit at local Nissan dealer was $30+ more, so this was a great deal. Kit went in exactly by the video. Only problems I had were: 1) could have used an extra inch or so of the harness already inside the truck behind the kit panel on the passenger side; and 2) the plug in the rear of the truck was truly stuck in there and hard to get out. Definitely recommend and this harness! 112661

- 118525

by: Darek H06/04/2017

Product was delivered on time, actually a little sooner than planned. The order process and ability to get what I wanted was great. Only down side is the product itself had very weak instructions. I had to have a mechanic friend of mine help for something that could have easily been stated in the instructions. I'd encourage the manufacture to step up their game regarding the instructions! 388745

- 118525

by: Robert Wright08/18/2014

After three attempts to buy this type of product from local parts retailers, I finally found etrailer. The information on the website is excellent! They even had a video of my EXACT product being installed! Ordering was quick and easy. On arrival I was able to install this in the parking lot in the dark with no tools other than light from my cell phone! Excellent product. Excellent retailer! 147191

- 118525

by: Paul K.10/09/2017

I recently purchased a trailer wiring harness for my 2012 Nissan Frontier...came quicker than expected, installed both parts over football halftime, and they checked out was excellent...I don’t know anything that you could have done to make this a more enjoyable purchasing experience...will def use this site again, and have already recommended it to family !...great job! 440978

- 118525

by: Stuart03/16/2015

I ordered the tail/trailer light module kit and mounting bracket for my 2011 Nissan Frontier. The order arrived in three days. Wow, talk about fast delivery. With the help of a YouTube video and the written instructions, I had it installed in about 30 minutes. Super easy. The entire cost was under $60.00, far less than the $300.00 the Nissan dealership wanted. Thank you etrailer!!! 178521

- 118525

by: Dave L05/30/2012

Great shipping came in about 5 days on standard ground postal shipping,,, product was per the model for nissan xterra 2005 and installed as shown in video for that suv , also had printed instructions and photos , but after watching the short on line video really did not need printed ones , worked first time and needed nissan connector was right behind kick panel as shown in video 42103

- 118525

by: Steve K.07/13/2016

The wiring harness was installed without any problems. When I ordered the equipment I called your help line thinking I received the wrong harness. Your service guy explained to me what needed to be done in greater detail. He was right I was the typical guy that does not read instructions carefully. Great product. I'll use you again in the future when the need comes up... 271503

Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring
Do you have a question about this Custom Fit Vehicle Wiring?

  • Are Relays Required to Activate the Trailer Wiring Harness on a Nissan Frontier
  • On the Nissan Frontier and other Nissan vehicles, if the vehicle did not come with a factory tow package it will not have a functioning wiring harness even if one, like # 118263, is added. There will be relays that will need to be inserted to make the trailer wiring harness fully functional. If your Nissan did not come with a factory tow package, you would need to use wiring harness # 118525. This harness comes with the relays needed and the wiring required to make everything functional....
    view full answer...

  • No Power For Trailer Running lights at 4-Way Trailer Plug on a 2012 Nissan Frontier
  • I checked with Valley Industries and the part number you referenced 30608, is not designed for use with the 2012 Nissan Frontier. It is designed for Titan and Pathfinder vehicles. The correct wiring harness for your Frontier without a factory tow package would be part # 118525. The relays and harnesses in this package will provide all the parts for activation of the brake-turn-taillights on your 2012 Nissan Frontier. We have a video showing this installation that should be helpful, see...
    view full answer...

  • Trailer Hitch Recommendation for a 2015 Nissan Frontier
  • I did some checking and for your 2015 Nissan Frontier the Curt hitch part # 13241 has been confirmed as a fit. The # 118525 has been confirmed as a fit as well for your vehicle.
    view full answer...

  • 10-Amp Fuse Keeps Blowing in 2011 Nissan Frontier When Using T-One Vehicle Wiring Harness #118525
  • If your Frontier running light fuse blows when you connect your trailer there are several potential causes. It could be that the trailer lights are demanding more current than can be provided by the harness, although this is unlikely since the TowReady Harness # 118525 can deliver up to 7.5 amps per circuit which is higher than many similar products. If your trailer has been modified by the addition of extra running lights these may demand more current than can be provided. What is more...
    view full answer...

  • Installation of Tow Ready Trailer Wiring Harness # 118525 on 2012 Nissan Pathfinder
  • Although we have not yet had the opportunity to install the # 118525 trailer wiring harness on a 2012 Pathfinder, my contact at Tow Ready tells me that the only difference in the installation between the Pathfinder, Xterra and Frontier is the location of the connector at the rear of the vehicle that the 4-pole connector would plug into. The procedure for installing the remainder of the harness and the relays behind the kick panel in the passenger side front seat foot well is exactly...
    view full answer...

  • Curt Relay Kit Recommendation for a 2012 Nissan Frontier for Trailer Wiring Installation
  • You will need the Curt Relay Kit # C57000 to complete the wiring on your 2012 Nissan Frontier. Like you guessed, since your 2012 did not have the tow package it is missing a couple connection points. Check out the video I attached that shows these relays being installed on a similar vehicle as yours
    view full answer...

  • How to Determine if a 2009 Nissan Xterra has a Factory Tow Package to Add Trailer Wiring
  • The easiest and definitive way to determine if your 2009 Nissan Xterra has a factory tow package is to give the VIN to a dealership and have them determine what options it came with from the factory. A another way would be to use a circuit tester, like # 3808 if needed, and test the factory connection point under the vehicle. It should show signals when the brakes are applied, lights are turned on, and turn signals engaged. However, even if it shows signals it does not necessarily...
    view full answer...

  • Which Wiring Harness is Needed For 2010 Nissan Frontier Without the Factory Tow Package
  • On the 2010 Nissan Frontier, if the vehicle did not come with a factory tow package it will not have a functioning wiring harness even if the Tow Ready Wiring Harness, part # 118263, is added. There will be relays that will need to be inserted to make the trailer wiring harness fully functional. The relays are not normally included on a vehicle if it does not have the factory tow package. Usually the relays would be installed in the relay box under the hood if it came with the factory...
    view full answer...

  • Installing a Trailer Brake Controller on a 2006 Nissan Frontier
  • If your 2006 Nissan Frontier came with a factory 7-Way and you are using a Tekonsha brake controller like # 90885 all you will need to install it is wiring harness # 3050-P. If the truck did not come with a trailer connector you will need to first install a 4-Way wiring harness, # 118525, and then install a 7-Way installation kit # ETBC7. I have included some links that should help you with installation.
    view full answer...

  • Trailer Wiring Harness for a 2014 Nissan Frontier
  • There are a couple of trailer wiring options available for the 2014 Nissan Frontier. We have harness # 118525 which plugs into the vehicle in two places: behind the passengers side kick panel and at the back of the vehicle. I have linked the instructions and a video showing installation on a 2012 Frontier. The other option is a hardwire installation using kit # 119147KIT. You will have to cut and splice into the vehicle tail light wiring to installation this harness. I have linked its...
    view full answer...

  • Trailer Running Lights are Not Working on Trailer Towed by a 2009 Nissan Xterra
  • If your 2009 Nissan Xterra did not come with a factory tow package, you would need to have the appropriate relays in addition to a wiring harness in order for all of the trailer lights to work properly. The harness that you have referenced, # 118525, does come with the relays needed to make the trailer wiring harness fully functional. I have included a link to the installation details for you. If your Xterra came with a tow package you can check to see if the relays are there and functioning....
    view full answer...

  • Trailer Wiring Harness Recommendation for a 2005 Nissan Frontier without Factory Tow Package
  • Since your 2005 Nissan Frontier did not come with a tow package, I recommend trailer wiring harness # 118525. I have included a link to the installation details and a video showing a typical installation for you to view.
    view full answer...

  • How to Determine if 2005 Nissan Frontier has Tow Package for Installing Trailer Wiring
  • The pin needed to install the # 118263 will be on the frame of the truck, but what matters most is whether or not the rest of the tow package wiring will be present. You would need to remove the passenger side kick panel to the right of where a passengers right foot would be. If there is a harness plugged in there that looks like what's picture then all you would need is the # 118263. If not you would need the part # 118525 instead.
    view full answer...

  • Installing 7-Way Trailer Connector on 2014 Nissan Frontier
  • To install a 7-way, you'd first need to install the 4-pole flat connector (if you don't already have one.) I'd recommend the Tow Ready wiring harness, part # 118525. Once that's in place, how you would proceed will depend on the trailer you're pulling. If the trailer does NOT have brakes, but just the lighting circuits, you can simply use the # 37185 adapter. The adapter would plug into your existing 4-pole, and the white wire with the ring terminal on it would ground to the vehicle...
    view full answer...

  • Trailer Wiring Harness for a 2006 Nissan Xterra without Factory Tow Package
  • For a 2006 Nissan Xterra you can use wiring harness # 118525 that you have referenced. This is the correct harness for an Xterra that did NOT come with a factory 4-Way or 7-Way trailer connector. I have included a link to a video showing a typical installation and a link to the installation instructions.
    view full answer...

  • Wiring Harness and Other Parts Needed To Tow Small Utility Trailer With 2011 Nissan Frontier
  • To pull a small utility trailer with your 2011 Nissan Frontier you will need a hitch, ball mount, hitch ball, and a wiring harness for lighting on the trailer. If your Nissan did not come with a factory tow package, you would need to use Tow Ready T-One Wiring Harness, part # 118263. This harness comes with the relays needed and the wiring required to make everything functional on a trailer. I have included a link to the installation details for you. The hitch I would recommend would...
    view full answer...

  • Tow Ready Trailer Tail Light Wiring Harness Recommendation for a 2010 Nissan Xterra
  • The Tow Ready Custom Fit Vehicle Wiring # 118525 that you referenced includes relays and uses the 12 volt power source that is behind the passenger side kick panel. Once installed on your 2010 Nissan Xterra it would not overload the tail light circuitry of your vehicle as this unit draws the amperage needed to activate the 4-way circuits from an external 12 volt source. It only uses the tail light circuits as signal wires, and then draws the amperage from the external 12 volt source. I...
    view full answer...

  • Installing Trailer Wiring Harness on 2013 Nissan Xterra w/out Tow Package
  • If your Xterra was not equipped with the factory tow package the port under the vehicle where the 4-pole trailer connector like part # C55441 plugs in will NOT be fully active. There is a jumper harness and relays that are needed to activate the tow package. The Tow Ready # 118525 that we offer includes the 4-pole that plugs into the connector along the drivers side frame rail alongside the spare tire, as well as the jumper harness and relays. The relays plug into the jumper harness,...
    view full answer...

  • Trailer Hitch and Wiring Recommendations for a 2012 Nissan Xterra
  • The Valley hitch for the 2012 Nissan Xterra is not available. You will also want to check the vehicle owners manual to determine the towing capacities of the vehicle. Even if a hitch is rated for 500 pounds tongue weight, 5,000 gross trailer weight does not mean the vehicle is. The Draw-Tite hitch, # 75291, which I recommend is rated for 350/3,500 pounds but when used with weight distribution it is rated for 550/5,500 pounds. Again you will have to check the owners manual to determine...
    view full answer...

  • Trailer Wiring Recommendation for a 2011 Nissan Frontier
  • You are correct on all counts. Wiring harness # 118525 for the 2011 Nissan Frontier is a newer product, it is a T-one style of connector, it does come with all the relays needed to activate the wiring, and it is more professional than a splice-in type of harness. I have included a link to the installation details for you. The only part that I recommend adding is a mounting bracket for the 4-Way. What you can do is use # 18144 with short bracket # 18140 or long bracket # C57202. This...
    view full answer...

  • What is Needed for a Complete Tow Package for 2005 Nissan Xterra 4wd
  • I recommend the Curt Trailer Hitch # 13514. The class III hitch has a 2-inch receiver, 4000-pound towing and 400-pound tongue weight capacity and bolts onto your Xterra's frame with no welding required. You will also need a wiring harness. Which harness you require depends on whether your vehicle comes with a factory 7-way connector, a factory 4-way connector or without a factory 7-way or 4-way connector. If your vehicle comes with a factory 7-way connector, you will need part # 118266. To...
    view full answer...

  • 2005 Nissan Xterra Trailer Wiring Troubleshoot
  • According to Tow Ready, if your Xterra does not have the full tow package installed, the # 118263 will install, but as you have found, the trailer tail lights will not function. It sounds as if your Xterra does not have the factory tow package. For the Xterra without the tow package, we recommend either the Tow Ready # 118525 which includes the sub harness and relays (which unfortunately, are not sold separately) or the Hopkins # 43605 that taps inline with the factory harness connection...
    view full answer...

  • Availability of Trailer Wiring Harness for 2014 Nissan Frontier
  • I spoke with my contact in the Tech Services department at Tow Ready. He tells me that they have recently determined that the # 118525 T-One Vehicle Wiring Harness carries over to the 2014 Frontier models. The kit includes the 4-pole connector that plugs into the connector on the drivers side frame rail alongside the spare tire and the jumper and relays to activate the factory tow package. The relays and jumper plug into a connector located behind the toe kick in the passenger-side foot...
    view full answer...

  • Trailer Wiring Harness for 2014 Nissan PRO4X Xterra without Tow Package
  • If your 2014 Nissan Xterra PRO4X did not come with a factory tow package then Curt wiring harness # C55441 will not work. It is designed for models that came with a factory tow package. For models without a tow package you would use # 118525. I have linked a video showing an example installation for you.
    view full answer...

  • Does Curt Relay Kit for Nissan Aftermarket Tow Package # C57000 Fit 2005 Nissan Pathfinder
  • The Curt Relay Kit for Nissan Aftermarket Tow Package, part # C57000, includes three relays, two blue relays for the turn signals and a brown relay for the 12V power circuit. These are intended for the Armada and Titan (but not the Pathfinder) and are to be inserted into a harness located behind the passenger-side kick panel. If your 2005 Pathfinder does not have this harness in place, you can instead use part # 118525, which includes the three correct relays, the passenger-side harness...
    view full answer...

  • Installing a Trailer Connector and Brake Controller on a 2010 Nissan Frontier
  • The trailer wiring harness that you will want for your 2010 Nissan Frontier is the Tow Ready T-One Vehicle Wiring Harness, # 118266. This kit gives you all of the necessary harnesses and relays that you will need for a fully functioning 7-way trailer connector except for the brake controller. I have attached the installation instructions for this kit for you to check out. Once you have this kit installed, you will need a brake controller and a brake controller wiring adapter. For...
    view full answer...

  • Trailer Brake/Turn Lights Not Working After Installing Wiring Harness on a 2012 Nissan Frontier
  • There are some Nissan vehicles that require an additional relay from a Nissan dealer to make everything fully functional. However if you have found all the relays in the proper places and have installed the relays in wiring harness # 118525 as indicated in the instructions, linked for referenced, and like in the video I have included then there could a problem in a different location. Use a circuit tester like # 3808 if you do not already have one to test the 4-Way end of the harness...
    view full answer...

  • Trailer Hitch Recommendation for a 2011 Nissan Xterra
  • All of the trailer hitches available for a 2011 Nissan Xterra are going to be Class III trailer hitches. This is good because that is exactly what I would recommend. A Class III trailer hitch is going to give you plenty of gross trailer weight capacity and the 2 inch receiver will allow you more options for accessories like bike racks and cargo carriers. Basically, all 3 of the available hitches for your vehicle install in the same way. If you are looking to save a little money, go with...
    view full answer...

  • Installation of Trailer Wiring Harness on a 2010 Nissan Xterra
  • Step 4 in the instructions for wiring harness # 118525, linked for reference, seems to be where you are running into a little trouble. Before plugging in the harness to the vehicle behind that kick panel, you will need to insert the relays on the the connector. On the other end of the 12 pin connector there are 3 ports, one for each of the relays. The brown one goes with the brown relay and the white plugs go with the blue relays. After you have plugged in everything you can tuck in...
    view full answer...

  • What is the Correct Trailer Wiring Harness for a 2008 Nissan Xterra without a Factory Tow Package
  • Since your 2008 Nissan Xterra does not have the factory tow package, you will need to use the Tow Ready wiring # 118525 that you have referenced. This kit comes with everything you will need to make the 4-Way functional including the wiring harnesses and the relays that activate it. I have included a link to the installation instructions for you.
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?

  • Why

    At we guarantee:

  • Highest quality custom fit vehicle wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate custom fit vehicle wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Satisfaction Guarantee
    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Test Fit:
Joe V
Photos by:
Jackie C
Expert Research:
Michael L
Video by:
Zack K
Video by:
Andrew K
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Video Edited:
Joshua S
Test Fit:
Nicholas E
Video Edited:
Jacob T
Test Fit:
Rick A
Expert Research:
John H
Video Edited:
Andrew L
Expert Research:
Adam R
Video by:
Kathleen M
Video Edited:
Mike H
Updated by:
Laura H
Video by:
Dustin K
Test Fit:
Shane T
Expert Research:
Jeffrey L
Video by:
Alan C
Video Edited:
Sue W
Test Fit:
Randy B
Video Edited:
Chris R
Updated by:
Sarah W
Video by:
Zach D
Test Fit:
Brent H

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

About Us
photos and videos

Original Photos & Videos

Produced to make sure you know what you are getting and you get exactly what you need.


Installations Completed

To make sure products work and fit the way they are supposed to.

etrailer call center

Phone Calls & Emails Answered

1,125,924 phone calls and 1,350,587 emails to help find the right solution.

etrailer training

Average Hours of Product Training

We get to know our products firsthand so experts can better help you.

etrailer service

Years of Quality Customer Service

Assisting our neighbors and customers, face to face at the counter.

etrailer experts

Pages of Expert Information

Created to make sure you have all the answers to your questions, from real experts.