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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118409
Our Price: $36.27
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Custom Fit Vehicle Wiring

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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector 4 Flat 118409
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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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118409 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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Tekonsha Custom Fit Vehicle Wiring - 118409

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • Tekonsha

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 points beneath the rear bumper
    • Plug in T-connector
  • 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 at the rear of your vehicle, on both the driver's and passenger's sides. You will find the harness behind protective covers near the rear bumper.

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.

118409 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118409 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118409

Average Customer Rating:  4.9 out of 5 stars   (374 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.

2005 Jeep Wrangler

Straight forward installation. Installed on 05 Wrangler 2-door. Passenger side tail light plug was a little hard to locate. It was tucked up high in the fender. Not shown in installation video. Otherwise great product and easy installation.

2006 Jeep Wrangler

Easy to install wiring system to the 06 TJ Jeep Wrangler.

Tl R.


Still working..


The harness was easy to install and had everything needed. I would recommend it with no hesitation.



Its been perfect. I love it. No ussues

Etrailer Expert

Mike L.


@Kirk We're happy to hear that, thanks!

1998 Jeep Wrangler

It is exactly what I needed to wire up my jeep detail trailer outstanding product very easy to do



Still working after one year without issues I reside in the southwest and the heat has not degraded the wiring harness

Etrailer Expert

Mike L.


@Scott That's good to hear, thank you!


Excellent fit. Makes good connection.


Very nice website that made it very easy for me to find the trailer hitch and wiring kit I was looking for at a great price and was delivered very fast. I really enjoyed the detailed information, pictures and even installation videos of the products I was purchasing that made it easy for me to install on my own. Curt hitch is very well made and was a breeze to install as was the Tekonsha plug and play wiring harness. The only thing I found odd was etrailer applied their advertising sticker on the hitch upside down, I had to remove it. I highly recommend etrailer and will definitely buy from them again in the near future.

2001 Jeep Wrangler

Great product, much better than those that cut into and attach to individual wires. Took about 30 minutes from beginning to end. 2001 Jeep Wrangler on the driver side the connections were made by removing the brake light assembly and on the drivers side the connections were made from below and behind the right tire. It was easy to drill the bumper with a hole saw making a nice out of the way connection to a one piece flat and round connector, see picture.

2004 Jeep Wrangler

Installed on 2004 Jeep wrangler. Very easy to install. Ran the wires through bumper and added some electrical loom to help protect wires from the elements. Installation was fast and easy! Recommended!

2002 Jeep Wrangler

I have had this product installed just over a year and still works perfectly. It was Installed on my 2002 wrangler. I mainly pull a small off-road trailer for camping. It’s held up perfectly.


This was so easy to connect, well worth the money.



I have had absolutely no problems with this wiring at all, very happy.

2006 Jeep Wrangler

I got exactly what i needed! and right on time too!! There is nothing better than to just plug connector n go! that was it for me! thanks to!!


Having a wiring harness, that is directly a "plug & play item is what I was looking for.


I have bought two hitches for our Kia's and a wire harness for our Jeep from etrailer. The product always ships quickly and the customer service is always very helpful and friendly. Their videos used to show installation has made every step very easy and without surprises. All of my hitch and accessory purchases will be thru etrailer from now on.

Kevin N.


he wiring kit for my Jeep is flawless and I have recommended it to my Jeep friends.

2006 Jeep Wrangler





Jeep TJ

Your wire harness is great.unfortunatly I can't get to my taillight plug on the passenger side.the smog canister is in the way with hoses hooked afraid of disconnecting and end up throwing a with that said I have the left taillight and left blinker that works.2003 tj jeep.probably not quite the review you wanted to screwed me up on something that should taken a half hour to still have a quality harness.thankyou

1999 Jeep TJ

This was an easy setup to install. The hitch went on my Jeep without much fuss, the wiring kit was easy to connect, and I think I was done in about an hour, start to finish. It's holding up well, in terms of finish and corrosion, and I'm really pleased with the purchase. Thank you, etrailer!



All good!


Kit came as described. Fit perfectly. Took me longer to repair wiring from poor installation of previous harness than to install new one.


Got my package today and installed it in just minutes! I am very pleased.

2006 Jeep TJ

received fast, haven't installed yet but looks high quality


Easy. I like it.

2005 Jeep Wrangler

I bought the T-One trailer harness for my 2005 Jeep Wrangler. IT WAS SSSOOOOOOO easy to install, it took longer to get the dried mud off my plastic flaps than it did to install this GREAT PRODUCT about 1/2 an hour. I did it without lifting my vehicle, just pulled the flaps down reached in and BANG done. No trying to separate wires, no hoping that the piercing clip will actually hit the copper. Just separate the plug ends snap the T-one in place, repeat for the other side, tie wrap the harness to the frame. DONE!! I WILL NEVER go through the splicing or piercing clips again to install a wiring harness. I love this, it was a great experience. THANK YOU FOR MAKING THIS!!!


Perfect fit! Thanks.


It took an hour or less to hook up my wiring harness, with just a few basic tools. It plugged right in, no splicing!!!

Mike S.


Fantastic! Still working great.


Wow! is awesome! We needed this to get the electricity from our Jeep to our trailer lights. web site was totally easy to find the wires right for our vehicle, and purchase them fast. The shipped with in the time line they said, installation was a screaming fast, and we were hauling in no time. Thanks again you never fail us.

2004 Jeep Wrangler

The product arrived as shown. Everything was packaged right, also great customer relations from begining to end. Very satisfied. Great old American service.

US Army Retired
Sgt. A. Soria

Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

  • Tips for Installing a Trailer Wiring Harness on a 2005 Jeep Wrangler
    When installing a trailer wiring harness such as # 118409 on your 2005 Jeep Wrangler the connection on the passenger's side of the vehicle is a little harder to get to. Instead of reach in from underneath to find it like on the driver's side, try reaching in from the side of the vehicle up near the bumper. I have included a link to a different video, installation is the same, but it is a little clearer than the video on the 2005.
    view full answer...
  • Troubleshooting a T-One Tow-Ready Hitch Wiring Adapter # 118409 Not working Properly
    If the vehicle lighting is working properly with the trailer wiring harness # 118409, installed and no trailer connected, the problem could be that you have the wires from the harness connected on the wrong sides of the vehicle or you have a problem with the wiring on the trailer. I suspect that there is a bad ground connection on the trailer and that when the trailer is connected the problems that arise will go away when the ground fault is corrected. Check the connection of the white...
    view full answer...
  • Are the Wires Long Enough to Install T-One Harness 118409 on a 2004 Jeep Wrangler
    This wiring harness is designed to fit 1998-2006 Jeep Wrangler, also known as the TJ. I have added a link to a video of this same kit being installed on a 2004 Jeep Wrangler so you can see how it should be done. I have also added a link to the instructions that walk through the install step by step.
    view full answer...
  • Install Instructions and Video for Trailer Wiring Harness in 2004 Jeep Wrangler
    I attached a link to the install instructions for the trailer wiring harness part # 118409 as well as an install video that shows the harness being installed in a 2004 Jeep Wrangler for you to check out as well.
    view full answer...
  • Passenger Side Wiring Harness Connection Location on a 2004 Jeep Wrangler
    We have video (see link) of the T-One Vehicle Wiring Harness, item # 118409, being installed on a 2004 Jeep Wrangler. You will see that the connection on the passengers side is located above a rubber covering just below the rear taillight. You will need to pull that rubber cover back out of the way to find it. Sometimes the connector is pushed up and out of easy view or covered with some thick tape so you will need to feel around a bit for it. You do have the right part.
    view full answer...
  • Tekonsha Wiring Harness 118409 Installation in 2004 Jeep Wrangler
    The Tekonsha T-One 4-Pole wiring harness # 118409 is meant to install at the OEM wiring that connects at the Wrangler's tail light housings. The included connectors are the no-splice plug-and-play type that install between the OEM wiring's plug and the connectors on the lights. Both driver and passenger side light assemblies should have the same connectors, as shown in the linked video on a 2004 Wrangler. If you review the video at the 1:20 mark you will see how our installer had to do...
    view full answer...
  • Trailer Wiring Recommendation for 2005 Jeep Wrangler Unlimited
    We can guarantee that the Tekonsha Trailer Wiring Harness part # 118409 is a fit for your 2005 Jeep Wrangler Unlimited. I attached an install video that shows this harness installed on a 2005 Wrangler just like yours.
    view full answer...
  • What 4-way Wiring Harness do you Recommend for my 2006 Jeep Wrangler
    We have a good solution but the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118356 is for older model Wranglers. Instead the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118409 is the one that will fit. Check out the video on the installation I've linked for you.
    view full answer...
  • Recommended Trailer Hitch for 2005 Jeep Wrangler
    Yes, the Curt Trailer Hitch Receiver # 13408 referenced in your question is confirmed to fit your 2005 Jeep Wrangler as long as it is not the Unlimited model. This Class III hitch is custom-fit for the Jeep, which means it will use existing holes in the vehicle's frame for a no-drill installation. It will provide a 2 inch receiver opening and a 4,000 pound towing weight capacity. I have attached the written installation instructions along with an installation video on the 2005 Jeep Wrangler...
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2006 Jeep Wrangler Unlimited LJ
    From what I was able to learn about the 2006 Jeep LJ, from 2004 to 2006 LJ was the unlimited version and had a 10 inch longer wheel base. Both can fall under the umbrella of a Wrangler so you will be able to use Tow Ready Custom Fit Vehicle Wiring, # 118409. I have included a link to the installation details and a video showing a typical installation on a 2006 Jeep Wrangler for reference.
    view full answer...
  • Which Trailer Wiring Harness To Use On A 2000 Jeep TJ Wrangler Sport
    Both the Tow Ready T-One Wiring Harness # 118409 and the Hopkins Plug-N-Tow Wiring Harness # 42615 will work on your 2000 Jeep TJ Wrangler Sport. The difference is what you mentioned, how they install to the vehicle. The Tow Ready harness uses T-One connectors that will plug into connectors on each side of the vehicle. The connectors are located under the Jeep, behind the rear bumper. The white ground wire will need to be attached to a good,clean ground on the vehicles metal frame. The...
    view full answer...
  • 4-Way Adapter Recommendation for a 2004 Jeep Wrangler
    A square 7-way is not a standard style of trailer connector. It could be possible that you have a round, blade-style 7-way and then all you would need to convert it to a 4-way would be a # 47345. Or you could just install a new 4-way with the part # 118409 and bypass the 7-way all together.
    view full answer...
  • Does Trailer Wiring 4-Way for 2004 Jeep Wrangler Require Tow Package or Not
    Hey Chuck it looks like you are looking for a 4-way trailer wiring solution for your 2004 Jeep Wrangler Rubicon. The kits that fit your vehicle like the Tekonsha part # 118409 fit if the vehicle happened to have the factory tow package or not as they install inline with the taillight connectors. Check the window sticker that came with your Jeep if you wanted to see if the tow package was added to it.
    view full answer...
  • 4-Way Trailer Wiring Kit Recommendation for 2005 Jeep Wrangler
    For a trailer wiring 4-way kit you'd need just the part # 118409 for your 2005 Jeep Wrangler which will work great with your current tow bar wiring.
    view full answer...
  • Availability of Trailer Wiring Harness for a 1997 Jeep Wrangler TJ
    The 1997 Jeep Wrangler TJ retained the same wiring that the Tow Ready Custom Fit Vehicle Wiring, item # 118356, was designed for. In 1998 the wiring for the TJ changed a bit and the Wiring harness was then changed to work and given part # 118409. To install a 4-Way wiring harness on your 1997 TJ you will need to use item # 118356. I checked fit with 3 different manufacturers and all of their wiring harnesses change between model year 1997 and 1998. I am including a link to the installation...
    view full answer...
  • Does Trailer Hitch Receiver for 2003 Jeep TJ Come With Wires
    The Curt Trailer Hitch Receiver # 13408 that fits your 2003 Jeep TJ does not come with a trailer wiring harness or any wiring, which is something that you would have to get separately. For that, the correct part is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118409. I've added links to some instructions and video installs for you to check out.
    view full answer...
  • Does Curt Trailer Hitch Receiver 13408 Fit 2000 Jeep Wrangler With Tube Bumper
    Yes, the Curt Trailer Hitch Receiver # 13408 will fit your 2000 Jeep Wrangler with the tube bumper. That exclusion only applies to one Draw-Tite hitch so this Curt hitch will work perfectly. If you plan on doing some towing with your Jeep and need a trailer wiring harness as well, the correct fit is the T-One Vehicle Wiring Harness # 118409. I have added links below to video installs for you to check out of the harness and the Curt Trailer Hitch Receiver # 13408.
    view full answer...
  • Does Curt Trailer Hitch Receiver Fit 2005 Jeep Wrangler
    Definitely a goo idea to confirm a fit before ordering, and the Curt Trailer Hitch Receiver # 13408 is a confirmed fit for your 2005 Jeep Wrangler. It is a match and is extremely easy to install, requiring you lift up the hitch and bolt it on. I have added a link to the written instructions as well as a video install of the Curt Trailer Hitch Receiver # 13408 on a 2005 Jeep Wrangler. If you are going to be towing and need a wiring harness to power your trailer lights, the right part...
    view full answer...
    Image 1 for
  • Stereo Loses Memory Settings After # 118409 Trailer Connector was Installed on Jeep Wrangler
    The taillight circuits of the Jeep Wrangler and circuits for the stereo are completely unrelated, so I can't see any way how the installation of the # 118409 T-One Vehicle Wiring Harness could affect how the stereo operates. The T-One operates by tapping into the existing taillight circuits, and even a poor ground connection for the T-One should only affect the operation of the trailer taillights, and not the stereo. I've checked with one of my buddies in the Tech Services department at...
    view full answer...
  • Trailer Right Turn & Right Brake Lights Do Not Work After Installing Wiring Adapter # 37185
    Both trailer right turn and right brake light signals are carried on the same wire, a green wire in the case of the Hopkins adapter # 37185. Since these are the only functions not working I suggest you first test the green wire on your Jeep's 4-pole harness, the harness that plugs in to the Hopkins adapter. You'll want to look for signs of discoloration or corrosion on the contact pin for the green wire; clean as needed. If you have a circuit tester like # 40376 you can test that pin while...
    view full answer...
    Image 1 for
  • Recommended Tow Wiring Harness for 2003 Jeep TJ
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118409 has rounded rectangular connections. It is the fit for the factory wiring harness for 1998-2006 Wranglers and TJ models. I've attached a video of an installation to assist.
    view full answer...
    Image 1 for
  • Why Do Different Hitches Install in Different Ways on a 2005 Jeep Wrangler
    One method is not really better than the other. There is just more than one way a hitch could be installed on the 2005 Jeep Wrangler. It would be slightly easier to install a hitch that mounts just to the bottoms of the frame rails, such as # 13408, since the mounting holes are a little easier to reach. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch...
    view full answer...
  • Will Hopkins Item # HM42635 Work For 2004 Jeep Wrangler
    The Hopkins Plug-In Harness, Item # HM42635, is not a confirmed fit for your 2004 Jeep Wrangler. What does fit is the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, Item # 118409. The Tekonsha wiring harness is a quick and easy install that plugs directly into your existing wiring. It will provide you with a 4-way flat trailer connector for your Jeep. It is also compatible with 5-pole, 6-pole, and 7-pole adapters which are sold separately. I have attached...
    view full answer...
  • Trailer Hitch and Wiring Recommendations for a 2006 Jeep Wrangler
    The most popular trailer hitch for your 2006 Jeep Wrangler is Curt hitch # 13408. This is a Class III hitch with a 2 inch receiver. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with clip, and a storage bag. If the ball mount kit does not have the right rise or drop to tow the trailer...
    view full answer...

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Info for this part was:

Employee Joe V
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