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  1. Custom Fit Vehicle Wiring
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  3. Custom Fit
  4. Trailer Hitch Wiring
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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118524
Our Price: $73.96
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118524 - Powered Converter - Tekonsha
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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. Powered ModuLite reduces strain on wiring system. 1-800-496-5010 to order Tekonsha custom fit vehicle wiring part number 118524 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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  • Reviews (71)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118524

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered 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. Powered ModuLite reduces strain on wiring system.


  • 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
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 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 behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness.

T-One Connection Location Points Behind Tail Lights

Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.

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.

ModuLite Powered Tail Light Converter

A ModuLite power module is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.

118524 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118524 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 - 118524

Average Customer Rating:  4.7 out of 5 stars   (71 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. Powered ModuLite reduces strain on wiring system.


The vehicle specific kit was relatively easy to install. it works great and when we had issues with the wiring harness collar coding Customer Service was right there to walk us through the install.


Has worked perfectly on my 2007 JEEP Liberty, hooks up to the standard
trailer plug and works great. Made 4 trips with a trailer in tow, absolutely perfect function for lights.

Installation was a breeze, I watched a few install videos. I did a few more steps than one would expect, mostly to secure the module into the chassis cavity of the left rear light cluster, and the B+ BLACK wire connected to the yellow fuse clip, and then the car battery POS terminal.

The mounting bracket was attached to the chassis with the included screws, BUT I drilled and then tapped the holes (were they 8-32 or 10-32 ? ) to screw the bolts directly into the chassis.

Gooped the bolts with a gel lithium grease for rust protection when I screwed
them into the chassis metal.

Suggections! Please replace the black B+ positive wire with a RED color insulation
wire, to maintain correlation with standard DC color coding for wiring.

Add a good 12-14AWG yellow jacket butt splice to the kit for the BLACK B+ positive
wire to the YELLOW fuse clip wire. I had to use one of my own stock, the butt splice you sent would not accept the 12 gauge wire.

Thanks guys! Highly recommend this kit for a 2007 JEEP Liberty.

Still working perfectly. Has not been a problem. I did tell a fellow Jeep Liberty owner about the availability of the kit. I shall definitely return for any more products for my Jeep. Big Thank you !!
Skip S - 07/02/2020


The instructions were just the right amount of detail and all the parts plugged right in to my old truck.


good price easy installation and works as expected

2002 Jeep Liberty

Easy installation, works great!

2006 Jeep Liberty

Delivered in reasonable time, ten days, but we are all the way on the west coast in Canada. Have ordered from etrailer in the past and highly recommend, best service around.

2018 Jeep Liberty

I purchased a trailer hitch for a Jeep Liberty about 18 months ago. Installation was simple with the instructions provided with the hardware and the videos on this site. I would encourage others to heed their warning that corrosion and rust should be removed from the holes on the vehicle before installing a hitch. Anyway, not only did the site contribute to simple installation, but their customer service was excellent. I received my hitch sooner than expected, which was beneficial because I needed to use it quickly. The whole system has been working great for this entire time. I have no complaints and will continue to use this site.


Insructions were clear. Everything I needed was in the kit. Works perfectly.


Hitch and wiring was ordered on Monday am, was at my door Wednesday 6pm. Very easy installation, good product. My only problem was that the bolts supplied with the hitch did not fit my Jeep. I had to go to the local hardware and buy 6 grade 8 bolts in the proper size, at 79 cents apiece.
I cleaned the nuts with a tap, still the provided bolts would not fit, but the ones from the hardware screwed right in. I did read the reviews on your site for this hitch, others have had the same problem.
That said, I would do business with e-trailer again.


My experience with was a great one. The sales rep. Rebecca N. was so delightful and knowledgeable. She walked me through the entire process right down to installation. Installing the hitch and wiring harness was simple. Thank you Rebecca and!
I will refer and do business with in the future.

2003 Jeep Liberty

Works great on my 2003 Jeep Liberty.

was very easy - other than running the power wire through the frame to the battery. The posted video was very helpful in figuring out the routing for that wire.

This was my first order and I am incredibly impressed by how complete and helpful the site has been - thanks!

2007 Jeep Liberty

Very easy installation on my 2007 Jeep Liberty Sport. I ran the wire from the battery underneath the vehicle along the same route as the rear brake lines up and over the rear axle and then to the trailer wiring harness.

2005 Jeep Liberty

It seems bizarre that you write a review about somebody doing exactly what they said they would do for you. Well, my experience has been horrible with customer service in the last 5 years. Then along comes e-trailer. I ordered the part and it shipped the same day. I had a confirmation email letting me know what part was on the way along with the tracking info. I had an email letting me know it was delivered to my house. Installation was a snap with best directions I have used in a long time. This was a great experience and it was handled with best customer service experience in years. Thank you e-trailer.


I purchase three hitch s from your company EZ to install now with the purchase of the wiring harnes theis wil fourth purchase very ez to run and attach I hope is well be my last ,if not I'll be back GREAT PLACE TO DO BUSINESS JAMIE made purchase EZ alway RIGTH the frist Time love place

2006 Jeep Liberty

Very satisfied with the product and the service.
Installation was very close to the video instructions.
The only thing keeping this from getting the highest mark: the wire loom and self tapping screw called for in the installation instructions for the black power wire were not included in the package, that required a trip to the store.


Product came as described. Easy to install. Really like the YouTube videos to help with the install. Most time consuming part was running the wire to the battery. Very Satisfied and much better than splicing wires.

2003 Jeep Liberty

I have multiple trailers jet ski, boat, utility, rv etc. is my go-to shop for my trailer maintenance needs.

etrailer understands no nonsense customers requiring real customer service. This is a rare business attribute nowadays.

2003 Jeep Liberty

Watched video on etrailer WEB site for 2003 Jeep Liberty. Installed harness without any problems in less than an hour. DO NOT connect either end of battery wire until you are satisfied with the "run" under the vehicle.

2007 Jeep Liberty

Installed this harness in my 2007 jeep liberty and in went in as advertized.(No issues) I look forward to doing future business with etrailer, for all my trailer and camper needs.

2006 Jeep Liberty

Easy to follow instructions.
The harness
was a perfect fit and very easy to install.
I would be glad to recommend

2005 Jeep Liberty

The product fits and works as advertised. Install too about 3 hours. 15-20 minutes for the harness connections and wire routing at rear of my 2005 Jeep Liberty and the rest of the time spent routing and securing the battery wire. That was the hardest part of the install.

2002 Jeep Liberty

Plugged right in! Couple quirks, needed a Torex 20 screwdriver and used more zip ties than what was included. Also, tried stuffing the control unit into the bumper area before I realized I could just stick it to the light housing itself. Much easier. Net took about 1.5 hours and most of that was crawling under the jeep routing the power line up to the battery. Easy....


This isn't my first installation of wiring for a trailer but this kit covered everything. I've never had to run the wiring to the battery but it all worked out and it's working beautifuly.


Shipment arrived a day early, very easy to install. This is to replace one I bought from a different company and it burned out in a year. The quality of this T connector appears to be superior to the one I had. A tad bit more expensive then the old one (about $20.00 more), but a real bargain compared to the $180.00 Jeep wants for theirs.

2004 Jeep Liberty

The product has been working very well for over a year now, towing my boat and trailer without difficulty or problems. I'm very pleased with the price and performance of the product. Thanx.

Show More Reviews

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

  • Troubleshooting No Left Turn Signal on T-1 Wiring Harness for a 2006 Jeep Liberty
    If you are checking the harness, item # 118524, without the trailer hooked up and there is no power on the yellow left turn circuit coming out of the converter, then you will need to check the ground wire on the vehicle and be sure it is securely connected to a good ground point. Then check the connectors behind the taillights and be sure they are securely connected. If all checks out then your converter has shorted out somehow and will need to be replaced. If you are checking the yellow...
    view full answer...
  • Troubleshooting Trailer Lights that Stop Working When Headlights Come On
    The problem you are having is a classic ground issue. If the ground wire to the trailer frame or the tail light grounds are not connected securely to clean, rust and paint free surfaces then when the headlights are turned the extra amperage draw for the running lights will cause all sorts of lighting issues. I would start by removing the ground wire at the trailer coupler and cleaning up the connection point and re-securing it to the trailer frame. Next I would check the ground connection...
    view full answer...
  • Trailer Wiring Recommendation for 2002 Jeep Liberty
    I have an easy to install trailer wiring harness that is a fit for your 2002 Jeep Liberty but it's not one that installs with a single connector that attaches at the rear of your vehicle. Instead you would want the Tekonsha kit part # 118524 which is a confirmed fit for your vehicle and plugs inline with the taillight connectors of your vehicle. I attached an install video for you to check out as well.
    view full answer...
  • Trailer Wiring Recommendation for a 2006 Jeep Liberty
    We have exactly what you need. For a 4-way wiring kit designed to fit your 2006 Jeep Liberty you would want the Tow Ready Wiring Harness part # 118524. This harness will plug inline with the taillights of your vehicle and would work great supplying the trailer lighting functions you need. I attached an install video for you to check out as well.
    view full answer...
  • Trailer Wiring Harness Recommendation for 2005 Jeep Liberty Renegade
    The wiring harness I recommend for your 2005 Jeep Liberty Renegade is the TowReady # 118524 because this particular 4-pole wiring kit offers the highest current output capacity. That means your trailer's lights will be brighter and you'll be less likely to have any overload issues. This wiring harness simply plugs in to your Liberty's tail lights, as shown in the linked video, and you'll have to route and splice only one wire. That wire routing process is outlined in the linked article.
    view full answer...
  • Where are the Connection Points for Tow Ready Custom Fit Vehicle Wiring, # 118524, 2007 Jeep Liberty
    The Tow Ready Custom Fit Vehicle Wiring, # 118524, for your 2007 Jeep Liberty will plug in line with the connectors directly behind the tail lights. You will have to remove the tail light assemblies from the rear of the vehicle to access the connection points. There are just a few screws holding each tail light on. Once off, you will pull the assembly away from the vehicle and the connection points will be right at the back of the assembly.
    view full answer...
  • Troubleshooting Smoke and Melting Trailer Wiring on a 2002 Jeep Liberty After 4-Way Install
    Most likely the problem you described is from a short on the trailer wiring. Running a powered converter is a great idea as it protects the taillight circuits of the vehicle it is installed on. But if you are seeing smoke, melted wire, and fuses blowing immediately the problem is a short somewhere on the wiring that is WAY overdrawing the circuits. If the smoke started after plugging the harness into your trailer then the problem is the trailer wiring, if the smoke started after plugging...
    view full answer...
  • 3 Trailer Wiring Harnesses Converters have Blown and Blew Fuses on a 2007 Jeep Liberty Limited
    Trailer wiring harnesses that have a power wire that connects to the vehicle battery such as # 118524 use that wire to actually power the trailer lights. It would still plug in line with the vehicle tail light wiring though to get the correct signals. The power wire would not necessarily prevent the problem from happening. If this issue is happening and you are not using the harness to connect to a trailer then I anticipate a problem where the wiring harness plugs into the vehicle. Check...
    view full answer...
  • Trailer Wiring Recommendation for a 2007 Jeep Liberty with or without Tow Package
    The Tow Ready wiring harness part # 118524 that you referenced can be installed on a 2007 Jeep Liberty with or without the tow package. It would work great on your vehicle and you can go ahead an connect the red power wire to the vehicle battery. I attached an install video for you to check out as well.
    view full answer...
  • 2011 Jeep Liberty Factory Tow Package Wiring Stopped Working After a Short Circuit
    On the 2011 Jeep Liberty with factory tow package there are fuses for the wiring in location M2 and location M4. If those are good then you can inspect the actual trailer connector and wiring going to it to see if the short caused significant physical damage causing the problem. If it is neither the fuses nor the wiring/connector then there is likely a deeper issue, possibly related to the vehicle computer. Since it is OEM tow package wiring the best thing to do in that situation is to...
    view full answer...
  • Why Does Trailer Wiring Harness for 2007 Jeep Liberty Require Converter Box
    The reason you can't wire a 4-way directly to the taillight wiring of your 2007 Jeep Liberty is because your vehicle has the stop lights and turn signals on separate bulbs which trailer wiring has these circuits on combined bulbs. That's why you need a kit like the part # 118524.
    view full answer...
  • Does Trailer Wiring Install Harness 118524 Affect Vehicle Blinkers
    The trailer wiring harness part # 118524 that you referenced will not affect how the turn signals of your 2007 Jeep Liberty illuminate and will only give you a way to allow the trailer taillights to operate. They will blink red on the trailer.
    view full answer...
  • Do I Need a Powered Modulite for a 2007 Jeep Liberty and What Part Would I Use
    For your 2007 Jeep Liberty, there are a couple of trailer wiring options. If the Liberty did not come with a tow package, you will need T-One Connector w/Upgraded Circuit Protected ModuLite, # 118524. A powered converter is required to protect the vehicle sensitive electronics on models not equipped with a tow package. If your Liberty did come with a factory tow package, you would need Tow Ready Custom Fit Vehicle Wiring, # 118381. A Liberty with a tow package has a wiring harness made...
    view full answer...
  • Trailer Wiring Harness Options for a 2002 Jeep Liberty
    Oddly enough a tow package will not necessarily include a trailer hitch. Evey vehicle manufacturer has a different set of components that make up a towing package. The only definitive way to determine if your 2002 Jeep Liberty has a tow package is to have a dealer run the VIN number of the vehicle to tell you what options it has. f you find that your Liberty did not come with the tow package, then it will not be set up from the factory to accept the # 42475 harness. You will instead need...
    view full answer...
  • Routing a Power Wire for a Trailer Wiring Harness on a 2002 Jeep Liberty
    The only other trailer wiring harness available for a 2002 Jeep Liberty is # 42475 and it will only work if the vehicle came with a factory tow package. For all other models, you need to use the T-Connector harness, # 118524. Running a power wire to the battery is required because it provides the power to the trailer lights while at the same time protecting the wiring on the vehicle. The connection is required or the harness will not work. Routing the wire to the battery is not difficult...
    view full answer...
  • Installing 4-Pole Trailer Connector on 2003 Jeep Liberty Already Wired for Flat Towing
    To provide a 4-pole connector on your Liberty for towing a trailer, you would need part # 118524. The Tow Ready T-1 connector installs inline at the point where the factory tail light harness plugs into the tail light assemblies. Other than running a wire to the positive battery terminal to provide power, installation is plug-and-play. Installing the Tow Ready # 118524 will not interfere with your existing wiring for flat towing. I have linked you to the install instructions for the T-1...
    view full answer...
  • Wiring Harness Recommendation for a 2004 Jeep Liberty Without a Tow Package
    I verified with my contact at Hopkins that the Hopkins Plug-in Wiring Harness, # 42475, will work on your 2004 Jeep Liberty if it did not come with a tow package. He also stated that the factory connection is typically on the passenger side, but it may be possible that the manufacturer routed the connection to the driver side. I would recommend checking the passenger side for a connector before attempting to connect it to the connector on the driver side. One thing that you will want...
    view full answer...
  • How to Determine if a 2004 Jeep Liberty has a Tow Package to Pick Out Trailer Wiring
    The most efficient way to determine if your vehicle has the tow package is to take your VIN number to a Jeep dealer and have them run it. They will be able to tell whether or not you have the tow package with that information. Or you could check the wiring in your vehicle to see if the correct connectors are present on your vehicle. Check out the installation instructions I attached that will show you how to access the area. If you have the tow package, or if you find the harness then...
    view full answer...
  • Recommended Trailer Wiring Harness For 2004 Jeep Liberty
    The wiring harness I recommend for your 2004 Jeep Liberty is the T-One Vehicle Wiring Harness, part # 118524. This harness simply plugs into the Jeep wiring located behind the tail lights. You will then run the hot lead up to the vehicle battery. I have attached a link to an installation video for this harness on a liberty you can check out. When working with electrical connectors I recommend using dielectric grease like part # 11755. This keeps dirt and moisture out of the electrical...
    view full answer...
  • Recommended Wiring For Trailer When Tow Bar Wiring Is Present At Tail Lights
    For your 2007 Jeep Liberty, if you have a t-connector harness like the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118524 which connects behind the driver and passenger side tail lights as you mentioned you will not be able to connect the trailer and the tow bar wiring simultaneously. I've attached a video that shows how we run the wiring behind the rear bumper from side to side and how we run the power to the battery through the frame. You do have another option...
    view full answer...
  • How To Connect 4-Pole Flat Vehicle Connector On Jeep Liberty To 5-Pole Flat Boat Trailer Connector
    On your 2006 Jeep Liberty the Tow Ready T-One Wiring Harness, # 118524, is the correct wiring harness. Using the Tow Ready Adapter 4 Pole to 5 Pole Trailer Wiring Adapter, # 20036, will work on your vehicle to give you the adapter to plug into your trailers 5-pole connector. That would be everything you need, no other wiring or adapters. The 5-pole connector on the Tow Ready adapter will plug into your boat trailers 5-pole and the other end will have a 4-pole connector that will plug into...
    view full answer...
  • Where are the Connection Points to Install a Trailer Wiring Harness on a 2004 Jeep Liberty
    The connection points for Trailer Wiring Harness, # 118524, for the 2004 Jeep Liberty are located behind the vehicle tail lights. The connection points and converter will be inside of the vehicle when installation is complete. The 4-Way will be under the vehicle and you can use a mounting bracket, like # 18144. I have included a link to the installation instructions for the wiring harness for you to view.
    view full answer...
  • Recommended Trailer Wiring Harness for 2007 Jeep Liberty Sport
    For your 2007 Jeep Liberty, the wiring harness you have found in the photo is not the correct harness for your trailer wiring. The Multi-Plug T-One Connector Assembly for 7-Way & 4 Pole Trailer Connector # 20135 is the correct fit for your factory wiring if you have a factory tow package and has a rectangular shaped harness that it connects to with flat pin connections. Even without the factory 7-way the connectors will still be rectangular and have flat pin compatibility like # 118524....
    view full answer...
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  • Will Wiring Harness from 2008 Jeep Liberty Work on 2005 Jeep Liberty
    I do have the wiring harness you need for your 2005 Jeep LIberty, however the harness you currently have that is designed for a 2008 Jeep Liberty will not work. This is because there was a generational change for the Liberty starting with the 2008 model year. There were enough changes with the electrical system on the vehicle that a new custom trailer wiring harness was required starting with the 2008 model, one that will not fit or work on previous model year vehicles. Your best option...
    view full answer...

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