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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. 4 Flat
  4. No Tow Package
  5. Trailer Hitch Wiring
  6. Vehicle End Connector
FITS 2019 Jeep Wrangler
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
Tekonsha

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

Part Number: 118786
In Stock
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$93.64
Retail:$146.65
You Save: 36%
Custom Fit Vehicle Wiring
Confirmed to Fit
2019 Jeep Wrangler

without factory Tow Package

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To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

118786 - Vehicle End Connector Tekonsha Custom Fit Vehicle Wiring
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2019 Jeep Wrangler Tekonsha custom fit vehicle wiring. Tekonsha reviews from other Wrangler owners. Expert custom fit vehicle wiring advice with thousands of helpful questions and answers. Great prices and fastest shipping.
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2019 Jeep Wrangler - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

  • 4 Flat
  • No Tow Package
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Plug-In
  • Tekonsha
  • Plug and Lead
  • Powered Converter
  • Visible

Quickly and easily install a 4-way trailer connector on your Jeep Wrangler with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


Features:

  • 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 power module that 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


Specs:

  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

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 access cover and 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. 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 Power Module

A ModuLite power module is built into this T-One connector. 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.



118786 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Replaces Tekonsha 118782

Installation Details 118786 Installation instructions

California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.9

372 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.

by:
jeep Wrangler

This was an easy to install wiring harness for my 2025 Jeep Wrangler. It plugs into the existing Jeep connectors so no wire splicing. My only complaint is the wires are not enclosed in wire loom and no bracket for the 4 pin trailer connector. I can't imagine it would add maybe $10 to the price.



by:
Jeep

Greta place to buy your trailer items. I ordered a complete wiring kit for my sons Jeep JL. We had everything we needed and I called a few times with questions. The person at etrailer talked me through the questions.

I have also bought trailer tires there with excellent results.



by:
jeep Wrangler

I installed this on a 2024 Jeep Wrangler Sport. Everything was as described in the installation video except l could not fish the passenger side wiring harness through the frame because a connector was too large to fit through the existing frame openings. I also could not fish the power wire through the frame to the battery due to very limited access to frame openings. Instead l placed the wiring in wire loom as recommended and zip tied it on top of the frame members. Everything is secure and works great. Thank you for your instructional videos and excellent service.



by:
2025 jeep Wrangler

Overall good and relatively easy to install. I was installing on a 2025 Jeep Wrangler. I had to cut and reconnect the green wire so I could run it through the frame. Also, I used some fish tape to go from the back to the front of the vehicle, to run it through the frame. I tried to feed the wire through the frame, but access and the curvature of the frame near the back axle required something a bit stiffer. I’d probably say it’s a 4.8, due to slight difficulty of install, but the product works great.



by:
2021 Jeep Wrangler Unlimited

Pretty straight forward install if you watch the video when installing. One comment, I found wiring through the frame extremely cumbersome so I installed along another string of wires above the frame. Be sure to buy the mount they sell separately.



by:

I was extremely pleased with the customer service I received before my purchase. I wanted to ensure I was getting exactly what I needed. Very pleased with my purchase and the customer service. That is rare these days.



by:

The hitch went on easy the wiring a little bit of work feeding through the frame but not bad at all that’s why I like these trailer hitch with the videos makes it nice and easy I appreciate it that very much



by:

Easy to install, hot wire attached to lug on side of fuse block w/fuse.
Use 4' flex rod for electrical to fish wire to fuse block under vehicle

Mike profile picture

Mike

3/26/2024

Working great



by:
2025 Jeep Wrangler Unlimited

No problems simple installation plenty of help on line or by phone great customer service thanks



by:
2025 JeepWrangler

Fantastic absolutely awesome from ordering that was so easy and direct to the lightening fast shipping definitely ordering from here again and again



by:

Great product and awesome installation videos



by:
2020 JeepWrangler

very easy install and good instructions



by:

Another successful order and install from etrailer.com! Always fast shipping and excellent installation guide videos! Installed on 2021 JL Wrangler EcoDiesel.



by:
2018 Jeep JL Wrangler Unlimited

I prefer to use this Tekonsha module for the vehicle that don`t have the factory tow harness. The module was tucked away in the body cavity behind the drivers side tail lamp assy. All wiring was covered in HD split loom. All wiring was concealed as much as possible by running them through the cross rail and frame rail up to the battery positive terminal. I did lengthen the green wire on the passenger side to accomplish this. All connections were done with heat shrink connectors. Installation did take longer than usual based on the wire routing I chose. Overall I am totally satisfied with this product.



by:

It is so easy ordering from eTrailer. Randall was excellent in helping me with the right parts to order.



by:

Great product. Easy to install. I ran the wire through the frame to the battery. I used a feeding fish line tool and you cant see the wire from the rear to the front.



by:
2018 JeepWrangler

I've purchased a handful of trailer hitches/wiring harnesses over the past 10 years and they have always been awesome!! Quality products and fast shipping every time!! Just recieved a new class 111 hitch & wiring harness for my 2018 Wrangler JL and installed the hitch in less then 10 minutes and the wiring was approximately an hour after watching the video provided on their website. Never been disappointed!!



by:

Everything bolted right up and the electrical was easy to install. Very happy!



by:

very easy install thanks to the outstanding video. Adding this and an $80 -2 inch receiver was way cheaper than buying from the dealer. Since I had the taillights off, i threw in a fuel filler door at the same time.



by:

It was hooked up by mechanic without a problem.
we never got to use it, because we decided not to tow a vehicle behind our RV,



by:
2018 Jeep JL Wrangler Unlimited

Easy to install, no cutting of factory wires, perfect. Be aware that the 2018 JK and JL have different taillight plugs, and you need to get the correct harness. This one only works on the JL.



by:

I made this purchase after watching the installation guides on YouTube. I'm not the most experienced "car guy", but everything went in super easy. I'm really satisfied.



by:
2020 Jeep Wrangler Unlimited

EVERYTHING CAME IN GOOD CONDITION AND WORKING ORDER...
YOUR VIDEO ON HOW TO INSTALL THIS WAS GREAT !



by:

Received it fast,in a good sealed box.Did not install yet but based on the reviews,should be a good product.



by:

Fast shipping great products


25
372
Show More Reviews

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

  • Difference Between Curt & Draw-Tite Trailer Hitches For 2018 Jeep Wrangler Unlimited
    Hi Ken, Starting with the wiring harness, I can verify for you the correct fit for the 2018 Jeep Wrangler Unlimited without a tow package is indeed the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118786. Then for the hitches, the biggest difference between the Curt Trailer Hitch Receiver # C13392 and Draw-Tite Trailer Hitch Receiver # DT78MR is the length of the receiver. The Draw-Tite has a shorter receiver that can make it a bit more of a pain to add a ball mount...
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  • What Hitch and Wiring do I Need for My 2025 Jeep Wrangler Sport S Unlimited?
    Hello Mike, Happy to get you the right wiring. I looked up the hitch number you mentioned the E99856 and I am not seeing that we have that in our system. In fact I do not see an etrailer branded hitch for your 2025 Jeep Wrangler Sport S Unlimited. So for the hitch I would go with the Curt Trailer Hitch Receiver - Custom Fit - Class III - 2" # C13392. For the wiring you will want the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118786. Don't forget to grab a # 18140...
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  • Is The Brake Light Relay Needed With The Roadmaster 4 Diode Wiring Harness On 2018 Jeep Wrangler JL?
    Good question, Chuck! You will not need the Brake Relay # RM-88400 when installing the Roadmaster 4 Diode Wiring Harness # RM-15267 on your 2018 Jeep Wrangler JL Unlimited. This is because the stop light switch circuit on your Jeep JL will go dead while the vehicle is in tow. With that being said, some of the braking systems will require a stop light switch, like the # RM-751490 (and a 12 volt outlet kit # RM-9332)), but that is dependent on which system it is. Do you already have a...
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  • Is There Tow Bar Lighting and Trailer Wiring Solution for 2015 Jeep Wrangler Sport S
    Hey Teo, we have a solution for you but we don't have any harnesses that work as both a tow bar lighting kit and a trailer wiring kit. So what you'd want is the Curt part # C96JR for the tow bar lighting and then for the trailer wiring you'd want the part # 118786. Essentially you'd plug both kits into each and then install them inline with the taillight harness connectors.
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  • What 5-Way Wiring Harness do You Recommend for My 2021 Jeep Wrangler Rubicon without Tow Package?
    I have a great 5-way solution for you. Unfortunately, we do not make a 5-way customized harness, but we do carry the parts needed to create one for your application. For this route on your 2021 Jeep Wrangler without a factory tow package, I recommend using the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118786 along with the Curt Trailer Connector Adapter - 4-Way Flat to 5-Way Flat - Vehicle End # C57187. If you are using this setup for a boat trailer application,...
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  • Will Installing Trailer Wiring Harness Void Warranty on 2019 Jeep Wrangler
    That is a great question. The good news is that consumers are protected by the Federal Magnuson-Moss Warranty Act. This act essentially states that if something were to break or go wrong on your Jeep and you take it in for warranty repair, the dealer must honor the warranty regardless of what modifications have been made unless the modification is what caused the issue. Installing an aftermarket wiring harness like the excellent Tekonsha T-One # 118786 yourself that you referenced will...
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  • Brake Controller and 7-Way Recommendation for 2019 Jeep Wrangler Unlimited
    To install a 7-way and brake controller in your 2019 Jeep Wrangler Unlimited first requires you to install a 4-way connector part # 118786 which provides all of the trailer lighting functions and then convert to a 7-way with the part # ETBC7 which the 4-way plugs into and comes with everything needed to wire up a brake controller. I attached an install video for this kit on a similar 2012 Jeep Wrangler Unlimited as yours for you to check out as well. For a brake controller I would recommend...
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  • Can Trailer Towing Wiring Be Installed When Flat Towing Wiring Is Already Installed?
    Great question, Victor! You can absolutely install trailer wiring if you already have flat towing wiring installed. The vast majority of trailer wiring will install inline with the taillights, just as most of the flat tow wiring does. Installing both will not negatively affect either system and we have people do it very often. For your 2025 Jeep Wrangler, I would recommend going with the Tekonsha T-One # 118786. This does install in the manner mentioned above and Tekonsha is known for...
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  • Trailer Hitch, 7-Way, and Brake Controller Recommendation for 2018 Jeep JL Wrangler Unlimited
    For your 2018 Jeep Wrangler JL Unlimited the Draw Tite part # DT78MR is a confirmed fit and would be an excellent option. For trailer wiring you'd need to start with a 4-way and then convert it to a 7 and 4-way. For that you'd need the part # 118786. Now if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. It also leaves you with a 4-way on the side of the socket as well. If you do have trailer brakes you would need...
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  • Is The Tekonsha T-One Vehicle Wiring Harness # 118786 Made With Solid Copper Wire
    Hi Bob, No, most if not all trailer wire harnesses, including the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118786, are made of stranded copper wire. The wiring typically has to pass through tight areas and be able to easily bend so stranded wire is the easier and more cost effective option over solid wire.
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  • Will The Curt Flat Tow Harness Also Work With Tekonsha Tow Harness on a 2023 Jeep Wrangler JL?
    Yes, the Curt Custom Tail Light Wiring Kit # C96JR will also connect with the T-One Vehicle Wiring Harness # 118786 on your 2023 Jeep Wrangler JL. These all use the same style factory connectors so they will plug in line of each other. If you have any additional lighting connected to the trailer connector on your Wrangler you will need to ensure you connect the Curt harness to the factory harness and then the Tekonsha trailer wiring into it then the tail lights so they get the power needed...
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  • Is 3.6V on 2020 Jeep Wrangler Unlimited Trailer Plug Abnormal
    If it's just a 4-Way Flat connector like the T-On # 118786 then I would be surprised to see that much power being pulled to the back of your 2020 Jeep Wrangler Unlimited, but if you have a 7-Way like what we find with the Wiring Kit # ETBC7 then 3.6V on the 12V power pin isn't out of the ordinary and you'll be fine. Attached are photos showing the functions per pin on both a 4-Way and a 7-Way connector for you to reference.
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    Image 1 for Image 2 for
  • 4-Flat Wiring for a 2021 Jeep Wrangler Sport and Where to Mount the Converter to Keep Elements Away
    Hello Carlos, Yes, you can most definitely secure the converter in the inside of the driver side rear light housing. The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118786 will be a great fit for your 2021 Jeep Wrangler. I went through the reviews and I see that one of our customers did the same thing, I attached the picture of where he installed the converter. I would also recommend grabbing a Mounting Bracket 4-Pole Flat # 18144 for a clean looking install. Happy...
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  • Will T-One Vehicle Wiring Harness fit 2018 Jeep JL Wrangler Sport S with LED Lights
    Yes, the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118786 is perfectly compatible with LED lights. This harness is a fit and work great on a 2018 Jeep JL Wrangler Sport S without the factory tow package. I have added a link to an installation video of this part for you to check out as well.
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  • How to Install a Trailer Wiring Harness on a 2019 Jeep Wrangler
    Yes, the installation of a trailer wiring harness will be different for a 2019 Jeep Wrangler MOAB when compared to a 2013 Jeep Wrangler MOAB but not by much. Instead of just plugging in one connector behind the driver side tail light you will need to plug in a connector behind the passenger side tail light as well, run a power wire to the Jeep's battery, and ground the harness to a bare metal surface. For the above, I recommend using the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer...
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  • Recommended Trailer Hitch Receiver for 2018 Jeep Wrangler Unlimited JK and JL Models
    All of the JL Wrangler Unlimited hitches we carry will work on the JK Wrangler Unlimited models, but there are some JK model hitches that are not compatible with the JL Wranglers based on fit guide from the manufacturer because they have a shorter receiver. The bolt mounting holes are in the exact same location. Unless you are doing rock crawling, I recommend getting the longer receiver like the # e98856 or Curt # C13392 which will allow more accessories such as bike racks and cargo...
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  • 4-Way Trailer Wiring Kit for 2020 Jeep Wrangler Unlimited
    Hey Tim, the Tekonsha trailer wiring harness part # 118786 is the correct trailer wiring harness for your 2020 Jeep Wrangler Unlimited and would be your best option as it has the easiest install and most reliable converter box. For a 4-way mounting bracket the part # 18144 would be a really great and easy option. For a quick and easy 4-way tester you could use the part # I26 as well. What will you be towing?
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  • How to Use 1Up LED Light Bar When Flat Towing a 2019 Jeep Wrangler Unlimited
    Hi, The Tekonsha T-One Wiring Kit # 118786 will fix your issue, because it will send power to the 4-Way flat whenever your tail lights receiver power. The diode kit you have prevents the OEM wiring from working all the way because the brake lights will conflict with the motorhome lights when flat towing. Hopefully this makes sense!
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  • Parts Needed to go From 4-Way to 7-Way for Brake Controller on 2018 Jeep JL Wrangler Rubicon
    We can absolutely get you the right parts to add a 7-way and brake controller with your 2018 Jeep Wrangler Rubicon. Since your Jeep already has a 4-way like the T-One Vehicle Wiring Harness # 118786, there is only one other part you will need: - Universal Installation Kit for Trailer Brake Controller # ETBC7 This will give you a 7-way connector, circuit breakers and the rest of the hardware needed to install a brake controller. The face of the 7-way does have a plug-in for a 4-way as...
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  • Recommended Hitch and Wiring Harness for a 2020 Jeep Wrangler Unlimited
    Hey Phillip. The mounting bracket item # 18144 is exactly what you need for the Blue Ox Trailer Hitch item # BLU33UR. This 2" hitch is custom fit for the 2020 Jeep Wrangler Unlimited. The mounting bracket will bolt directly to it. For a wiring harness, I recommend the T-One Vehicle Wiring Harness item # 118786. This custom-fit T-One connector plugs into your Jeep's wiring harness, which is located behind the tail lights. It will provide you with a 4-flat connector. What kind of trailer...
    view full answer...
  • Trailer Wiring Kit and Flat Tow Wiring Kit for 2021 Jeep Wrangler
    Hey Kelly, in order to have wiring for when your 2021 Jeep Wrangler is being flat towed and also when towing a trailer you would need to install two separate kits as unfortunately either of those can't be used as the other "in reverse". So for flat tow wiring we have the easy to install Curt kit part # C96JR which plugs right into the taillight wiring connectors of the Wrangler. Then for trailer wiring you'd want to install the Tekonsha part # 118786 at same time as the Curt kit. These...
    view full answer...
  • Troubleshooting Fuses Blowing on 2023 Entegra Odyssey Class C Motorhome Towing Jeep Wrangler Sport
    Hi Bruce; more than likely you can rule this out as the issue. The T-One Vehicle Wiring Harness # 118786 has the ModuLite Power Module which draws power from the vehicle battery so it won't be overloading any circuits on the motorhome that would blow a fuse. If you didn't have a powered module I could see it being a problem but that isn't the case here. I'm assuming you didn't start blowing fuses until you installed the trailer wiring which is why you're looking at it as a potential issue....
    view full answer...
  • Can a Flat Tow Wiring Harness and a Trailer Wiring Harness Be Used at the Same Time
    Hey Danny, yes you can do that and you can use the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118786 with the Curt Custom Tail Light Wiring Kit for Towed Vehicles # C96JR. These two would plug into each other, and then back into your vehicle giving your Jeep the ability to be flat towed and tow a trailer. If you need anything else, please feel free to drop a comment and let me know!
    view full answer...
  • Parts Needed to Add 7-Way to 2019 Jeep Wrangler
    I'm assuming this didn't have the factory tow package or any existing wiring already. The T-One Vehicle Wiring Harness # 118786 you were looking at will add a 4-way and then from there you will upgrade it to a 7-way using the # ETBC7.
    view full answer...


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