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  1. Custom Fit Vehicle Wiring
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  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
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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. 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.
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  • Reviews (346)
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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 Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (346 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.

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

2001 Jeep Wrangler

Super easy installation on a 2001 jeep wrangler. Just follow the instructions and it's a simple plug n play. Didn't need to strip and cut any existing wires or modify any existing connections.

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.


Excellent product. So easy to install, installed on my 2006 TJ Wrangler to flat tow behind my Allegro Bay MotorHome.

Great, no problems!
Terry - 03/08/2022


Harness arrived promptly and in perfect condition. Instructions were easy to follow. Installation was simple except for feeding wires from one side to the other (due to my aftermarket rear bumper). Harness plugged up easily on my '98 TJ.

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!

Jeep Wrangler

Trailer wiring kit for my Jeep Wrangler fit exactly as described. I consulted an online video for installation and it went in fairly easily. Works well and saved me significantly from paying to have it done.


I purchased this wiring harness for my 2001 Jeep Wrangler a year ago and all i have to say is that i am still happy with my purchase. I remember the installation being very smooth, plug n play and the harness has held up to all the elements and still is in great working condition. 10/10 recommend this purchase, definitely not a waste of money.


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.

2005 Jeep Wrangler

Easy to install on 2005

to install on 2005 Wrangler, except for a metal bracket on the passenger side which partially blocked the way. I cut it out to get access from below.


Super easy to install and works perfectly! Can’t get much easier.

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.

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!!

2015 Jeep TJ

Install was easy and was done in 15 minutes. Tested after install and everything worked as should. Has been a simple yet very effective addition to the TJ.


Fantastic product. Install could not be simpler, the hardest part was disconnecting the harnesses for each tail light as they had been connected for 14 years, but once that was done, the new wiring plugged right in and worked without any additional work.

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

2006 Jeep TJ

Worked well snapped right in 100% satisfied with the product now let’s see how long it will last with no problems I’d recommend it put it on a 2006 TJ Wrangler


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.

he wiring kit for my Jeep is flawless and I have recommended it to my Jeep friends.
Kevin N - 06/17/2016

Jeep Wrangler

This harness was just what I needed, easy to install on my Jeep Wrangler no regrets


Great price--great product--greater ser vice.

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!
John - 09/13/2017

2006 Jeep Wrangler


Brian - 08/30/2019


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

Fantastic! Still working great.
Mike S - 09/27/2015


This wiring harness was so simple to install, It literally took me 15 minutes to install it, and it works great

No issues at all, the wiring harness works perfectly.
John J - 07/09/2020

2001 Jeep TJ

Absolutely turn key! This honestly took me 15-20 minutes to install. Instructions were easy to follow. Shipping was super fast. Highly recommended.

Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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
  • 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
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Troubleshooting Wrong Trailer Wiring Harness Being Used on a 2000 Jeep Wrangler
    You are correct, the Plug-N-Tow (TM) Vehicle Wiring Harness, item # 32625, only plugs into a connection point on the driver side on the vehicles it is confirmed as a fit for. This is because Jeep has already run all the necessary wires to that port for you, so you do not have to run the wires across yourself, as you would have to with other models that plug into both the driver and passenger taillights. The issue you are experiencing is due to the fact that this harness is designed for...
    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...
  • Will Curt Trailer Hitch 13408 Fit a 2006 Jeep Wrangler with Factory Gas Tank Armor
    Curt trailer hitch # 13408 does not exclude models of the 2006 Jeep Wrangler with the factory gas tank armor you have. It does not fit Unlimited models though. But what I recommend is taking a look at the linked instructions as well as installation videos on the page and compare those to your Jeep to ensure fit. 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...
    view full answer...
  • Recommended Hitch for 1998 Jeep Wrangler TJ?
    The hitch I recommend for your 1998 Jeep Wrangler TJ is the Curt # 13408. It is a Class III, 2" hitch with a towing capacity of 4,000 lbs and a tongue weight capacity of 400 lbs. The customers who have used this hitch rave about it, with over 200 reviews it has an aggregate of nearly 5 stars. To add a 4-flat connector you would want # 118409 and I also recommend checking out Ball Mount Kit # 989900, which may fulfill your towing needs in one tidy package; two ball mounts - one with a 3/4”...
    view full answer...
  • 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...

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