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

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

Item # 118394

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Custom Fit Vehicle Wiring

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118394 - 4 Flat Tekonsha Custom Fit Vehicle Wiring
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Product Images

Customer Photos


  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Tekonsha
  • Converter
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Circuit-protected converter guards against shorts. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118394 or order online at etrailer.com. 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.


  • All Info
  • Reviews (147)
  • Q & A (25)
  • Videos (3)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118394

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. Circuit-protected converter guards against shorts.


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 - no cutting or splicing of wires
    • Locate connection points behind tail lights
    • Plug in T-connector
  • Includes circuit-protected tail light converter to ensure that your vehicle's wiring matches that of your trailer
    • Provides protection against electrical shorts and overloads
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 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 tail light assemblies to access this harness.


T-One Connection Location Points Behind Tail Lights

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.


Circuit-Protected Tail Light Converter

A tail light converter 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. The tail light converter combines 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.


This converter safeguards itself and your vehicle against possible electrical shorts and overloads with integrated short circuit protection. Just install the connector as indicated and rest assured that the wiring system of your vehicle will remain feedback-free.



118394 Tow Ready T-1 T-Connector - 4 Wire



118394 Installation InstructionsInstallation Details 118394 Installation instructions

This Product Fits The Following Vehicles

2005 - 2005 Jeep Grand Cherokee

2006 - 2006 Jeep Grand Cherokee excluding SRT-8

2005 - 2006 Jeep Grand Cherokee without factory tow package



California residents: click here


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


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




Video Transcript for Trailer Wiring Harness Installation - 2005 Jeep Grand Cherokee

Today on this 2005 Jeep Grand Cherokee we are going to be installing wiring harness part number 118394. Okay, we are at the rear of the Grand Cherokee here and we are going to go ahead and locate the ports that we are going to be plugging our wiring harness into. these ports are located directly behind the taillights on both sides of the vehicle. So, the first thing that we need to do is go ahead and remove both taillights. To do that, we need to remove the inboard screws that are holding it into place. There are two on each taillight. With those screws removed we can just kind of gently rock it back and forth to release the outboard side clips that are also holding the taillight into place. And with that pulled back, you can see on the back side of the taillight here is the port that we are going to need to disconnect and plug our harness in line to. And then for clarity, I am also going to remove this fasteners here at the bottom side of the wiring harness so I can set my taillight off to the side. 1:08

Alright, and starting over here on the driver side of the vehicle we are going to go ahead and start plugging our harness in line. The ports that we are going to be using on the driver side contain the yellow and brown wires on them. And before I connect this one to the taillight itself, I am going to go ahead and feed both the 4-pole end and and the passenger side harness through the opening in between the body and the bumper. And you will notice that the converter box that is built into the harness has double sided tape on the back side. So we want to go ahead and adhere that to the body component here. A good spot for that is just directly below the opening here for the taillight assembly on the body structure right back in here. Before I go ahead and adhere that to the body structure here, I want to go ahead and clean it off. 1:50

And then with the converter box adhered, we want to go ahead and take the white wire with the ring terminal on the end of it and ground it to the body component as well using the self guided screw that is provided with the installation kit. And with all of that done, we can go ahead and put the driver side taillight back on and we will continue underneath the vehicle where we will start routing our wires across. And now underneath the vehicle we want to go ahead and start routing our wires. We are going to take the 4-pole and just go ahead and route it to the center of the vehicle where I am going to tie it off here at the trailer hitch, using the fascia strap here on the backside of the bumper to kind of help hold the 4-pole in place for me. 2:27

And then we are going to take the passenger side connector, route it all of the way across and up through the same opening between the body and the bumper. Since the port is too big to wrap behind the same fascia strap, what we can actually do is remove these clips here that are attaching to the bottom of the cross member and pull those down. And we can actually route the wire behind there and use that to hold it in place. And we will just continue up to the passenger side connectors where we will go ahead and make our connections. With the passenger side taillight put back into place, our installation is essentially complete. And that will conclude the installation of wiring harness part number 118394 on a 2005 Jeep Grand Cherokee.


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118394

Average Customer Rating:  4.9 out of 5 stars   (147 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. Circuit-protected converter guards against shorts.

- 118394
by:
2006 Jeep Grand Cherokee

Product was exactly as advertised and installations was right on with the video presented for my vehicle. Estimated time to install was 30 minutes 434425



- 118394
by:
2006 Jeep Grand Cherokee

Perfect fit for my 2006 Jeep Grand Cherokee. Installed in less than 30 minutes and everything worked right the first try. 347582


Comments

still working fine

David H - 03/03/2018

35349

- 118394
by:

Fast service at my door way before I expected it to be. The wiring harness installed with ease with the help of etrailer video it was a great help and saved me a lot of money. 484162


Comments

Easy installation. Used for one year so far no problem what so ever. Quick delivery and now a trusted site.

Tony - 03/12/2019

50437

- 118394
by:
2006 Jeep Grand Cherokee

Hitch and wiring harness both installed in about 3 hours - had to grind down a little area with a dremel tool on the frame to install the hitch ( frame related ) didn't even take bumper off. Harness came in the mail around 2 pm in and working by 3 pm. Just for the sake of complaining - originally ordered harness through another online retailer, and after 10 days was notified that seller could not deliver the product, so a 1 star for them and had my new harness through etrailer in 5 days - GREAT TRANSACTION 515541



- 118394
by:
2005 Jeep Grand Cherokee

April 5 2014 Wow, Shipped the morning I ordered. With notification. I think it was 3 business days to get here. Anyway, it was quick. I bought the entire kit for my vehicle comprised of the hitch, wire harness, two ball mounts with the balls included. Nice heavy/strong box. Everything I needed. Instruction included. The hitch went on exactly as the on line video on my 2005 Grand Cherokee but I didn't need to use any of the spacers. A perfect fit. It took about 20 minutes to install the hitch, 5 minutes of that was getting the spare tire down and out of the way (first time). It's raining so I haven't done the wire harness yet but it looks just as simple and quick to do. It's a total plug and play situation really. Highly encourage anyone looking to get a hitch to look into purchasing from these folks. The web site, and the entire purchase experience to receiving the hitch and their follow-up on the order was first class. (Very nice, thank you.) 123876


Comments

Not a single problem

T M - 04/06/2015

10600

- 118394
by:

It’s been a whole year since I installed this hitch from etrailer and although I don’t use it that often, it still looks and works great! Also saved about [price] by installing this product instead of the dealer hitch. Install was easy due to the great instructions that came with it. Keep up the good work etrailer! 697177



- 118394
by:

Thanks for all the other reviews on this product. I felt confident buying it, and I wasn’t disappointed. Got it with the wiring harness and install was super simple. Took 30 min, tops. The inclusion of the plastic bumper clips was stellar. I didn’t have to worry about breaking the old ones. Thanks for the great product and service etrailer. 682172



- 118394
by:
2005 Jeep Grand Cherokee

Great quality. Timely delivery. Excellent fit. Easy installation 669969



- 118394
by:

Easy to install, a year later and they still work great. 647463



- 118394
by:

Thank you very much it works very well I hope it up tonight again thank you 577611



- 118394
by:

Nice, complete set of wires. Shipped on time and arrived quickly. Semi-easy install. Seems to be working just fine. Thanks e-trailer. Highly recommended prouduct. 575262



- 118394
by:
Jeep

Easiest thing to install on my jeep so far. Love it, works great! Simple plug and play! 562078



- 118394
by:
2005 Jeep Grand Cherokee

Good instructions and very fast install !! 560901



- 118394
by:

The product was as advertised and I was very satisfied with it and the service. 556916



- 118394
by:

Excellent product fast delivery great packaging and easy assembly anyone can do it!! 546192



- 118394
by:
2005 Jeep Grand Cherokee

Easiest wiring job I’ve ever done! 542674



- 118394
by:
2005 Jeep Grand Cherokee

Instructions with the wiring harness provided excellent information for completing the job. Thanks 510992



- 118394
by:
2006 Jeep Grand Cherokee

This went very easy. Would recommend. Thanks for all your help 504437



- 118394
by:
2006 Jeep Grand Cherokee

Simple to install. Just like the online video, 1, 2, 3. 501555



- 118394
by:
2006 Jeep Grand Cherokee

Wire length to passenger side could be about 4 inches longer. Also has to be close to the tail pipe on a 2006 Jeep Grand Cherokee. 500258



- 118394
by:
2005 Jeep Grand Cherokee

It took me all of 30 minutes to put the kit in my vehicle. I couldn't believe how easy it was. I wish the wires we're a little bit longer that go to the passenger side. Other than that it was Flawless operation. Great product great price! Thank you Rocky 498885



- 118394
by:

Very easy. My only problem was that I hooked it up then decided to route it through the bumper to make it a nicer setup. Got the wiring harness backward so have to redo the thing. My bad. I am goofy 480945



- 118394
by:

Super fast service and shipping. Easy install and fitment was perfect. At a time when it is hard to find items in a brick and mortar store it is nice to be able to order and receive your items quickly and actually get what you needed. Thanks. Would definitely use etrailer again. 447159



- 118394
by:

Great knowledge by Sandy j and great delivery time Thank you. 433874



- 118394
by:
2005 Jeep Grand Cherokee

The installation took less than 20 minutes and works perfectly. 431053



- 118394
by:

The wiring harness went on very easily. The only problem was that the right side wires should have been about a foot longer so that the harness could be routed without being so tight. 430466



- 118394
by:
2006 Jeep Grand Cherokee

Easy installation and perfect fit. Worked great and nice price! Very happy with purchase. 428196



- 118394
by:

Great product for a great price. The harness snapped into place without any issues. I would highly recommend it to anyone. 419879



- 118394
by:
2005 Jeep Grand Cherokee

At first I was concerned about how long it would take to install. Guys/Gals, it took me 30 minutes with basic hand tools! Simple, easy and fast. Everything I buy should be this easy. 407827



- 118394
by:
2006 Jeep Grand Cherokee

Product was as advertised. The phone support was good. Shipping was a little quicker than I had expected. The price was in line with most other places. 404725



- 118394
by:
2006 Jeep Grand Cherokee

Easy to install and everything you need to install it is included. 401927



- 118394
by:

Excellent customer service and assistance in picking out the correct product. The product arrived within a few days of placing the order. Very easy to install. The product works flawlessly. I used it to replace/override my factory installed trailer wiring system. 399207


Comments

It is still working flawlessly. Thank you for your follow up.

Tomm F - 06/29/2018

40361

- 118394
by:
2005 Jeep Grand Cherokee

This kit was easy to install for anyone with moderate mechanical skills. I had no issues at all and it worked perfectly. I definitely recommend the product!! 398520



- 118394
by:
2005 Jeep Grand Cherokee

Easy install. 388223



- 118394
by:

Works well... Four stars. Because it corroded with the cover on. Works great easy install too! 383410



- 118394
by:
2006 Jeep Grand Cherokee

simple install 382011



- 118394
by:

I had this wiring harness installed and working immediately in about 15 minutes. Very easy to install and the plugs were a perfect fit. The converter box was small enough to tuck inside just below the tail light and the wires were the perfect length so there wasn't a lot of extra wire to deal with. 369313



- 118394
by:
2005 Jeep Grand Cherokee

This wiring harness was very easy to install, modifications to the car are NOT needed, it just plugs into the existing car harness, and the directions are very good. The price is great and the harness works very well. I have had no issues with it and have been using it for a year. If not for this harness I would have had to have the dealer install a factory harness and program the computer at a very high cost. I highly recommend this harness. 358227


Comments

Product working well, no problems after 1 year of use

Ron R - 03/24/2018

36382

- 118394
by:
2006 Jeep Grand Cherokee

Plug and play, only took 20 minutes to install, it was real easy. I suggest you watch the You Tube video a couple times as this helped clarify how to install it so when I was doing my Jeep there was no question on what to do. 341036



- 118394
by:
2006 Jeep Grand Cherokee

Super easy installation. Instructions were easy to read and follow. Took less than 30 minutes. Super happy with the product. 338490



- 118394
by:
2006 Jeep Grand Cherokee

Great Product, Great Price, very easy to install 322368



- 118394
by:
2005 Jeep Grand Cherokee

Great overall experience. 321565



- 118394
by:
2006 Jeep Grand Cherokee

products came in a timely manner, installation video is very easy to follow. You could not ask for more. 313185



- 118394
by:
2005 Jeep Grand Cherokee

Fit perfect and install was a snap. The hardest part was opening the bags with the zip ties and screws (the plastic is pretty thick). Perfect length of wire to route with and zip tie to factory harness. Order was shipped fast and according to the shipping email, was en route within hours. Arrived two days earlier than original estimate. Will definitely be a return customer for any trailer needs. Thanks for the great service! 312622



- 118394
by:
2005 Jeep Grand Cherokee

Easy to install. Took all of 10 minutes. Previous owner of my vehicle has installed some other brand and none of the trailer lights would work. This harness was perfect! 302804


Comments

I still love the product. It gets a lot of use.Thanks for the follow up.

Mike - 10/12/2017

29104

- 118394
by:

I've had this product for a year and only used it a few times to trailer my boat. The initial install was very easy and the instructions were very detailed. It worked perfectly every time I've used it. The only negative is that after only 1 year and about 5 uses the wiring has gotten extremely stiff and the contacts terribly corroded. It was stored with the rubber cover when not in use. Yes I realize it's been exposed to salt water, but my previous wiring harnesses lasted 7-8 years with frequent salt water use and I just don't see this one lasting half as long unfortunately. 291406



- 118394
by:

Was easy and quick to install. Works g reat! 286992


Comments

GREAT! No problems at all. Thanks.

Deborah W - 08/24/2017

27547

- 118394
by:

The wiring harness was easy to install and worked perfectly. Shipping was fast. I will use etrailer.com for all my future trailer needs. 279683


Comments

After a year, the wiring harness works perfectly.

Matthew S - 08/07/2017

26937

- 118394
by:
2005 Jeep Grand Cherokee

My wife and I installed this setup in about 10 minutes. Couldn't have been easier or simpler! After 1 year everything is working great and no failures or mishaps. 268181



- 118394
by:
2006 Jeep Grand Cherokee

I haven't tried to pull anything yet but the set up was very simple and quick! Everything was in excellent shape and clicked in perfectly! 267810


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Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

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


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  • If your 2006 Jeep Grand Cherokee Limited did not have a factory trailer package you'll need to start off with a basic 4-pole wiring harness and then add the 7-way. Once you have a 7-way installed this connector will be able to carry trailer brake, tail and turn light functions as well as carry 12V auxiliary power, trailer brake power and reverse light signals - once those additional connections are made. The 4-pole harness I suggest for your vehicle is the Tow Ready # 118394 which is...
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  • If you look at the back of your 2006 Jeep Grand Cherokee and see a wiring connector that looks like the Tow Ready Wiring harness part # 20135 then you have a 7-way. Another option you could have is a 4-way which would look like part # 18172, or you might not have any connector at all. To add a 4-way you would first want the Tow Ready Wiring harness part # 118394. If you needed to upgrade to a 7-way you would need the 4-Way to 7-Way adapter part # 37185 after installing the #118394. For...
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  • Availability of a Plug and Play Trailer Wiring Harness for a 2005 to 2006 Jeep Grand Cherokee
  • The T-One Vehicle Wiring Harness with 4-Pole Trailer Connector, # 118394, for the Jeep Grand Cherokee should not require the vehicle computer or the converter itself to be flashed or reset. This harness plugs in line with the vehicle tail lights so there is no cutting or splicing wires, so it is what can be considered as a plug and play harness. I have included a link to the installation details and a video showing a typical installation for you to view.
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  • Installation of Trailer Wiring Harness and Other Parts for Towing with a 2005 Jeep Grand Cherokee
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  • Parts Needed to Install a 7-Way on a 2005 Jeep Grand Cherokee
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  • Will a T-One Vehicle Wiring Harness fit Into a 2005 Jeep Grand Cherokee?
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  • Troubleshooting a Malfunction T-One Harness on a 2005 Jeep Grand Cherokee
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  • 4-Way Recommendation for 2005 Jeep Grand Cherokee for Light Bar
  • Sounds like you are in need of a 4-way trailer wiring harness on your 2005 Jeep Grand Cherokee. For that you would want to use the Tekonsha kit part # 118394 which is a confirmed fit. Now if you want to tap into the reverse light circuit you will need to find that circuit on your vehicle by testing the wires that run into the reverse lights with a circuit tester like part # 3808. The wire that sees voltage when the vehicle is put in reverse is the one to attach to the white wire of your...
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  • Recommended Trailer Hitch And Trailer Wiring For 2005 Jeep Grand Cherokee
  • The first item I recommend is the Draw-Tite Trailer Hitch, part # 75338. This is a Class lll hitch and it has a 2 inch receiver opening. If you plan on doing some towing you might be interested in 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. For a trailer that size many do not have brakes...
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  • 4-Way and 7-Way Trailer Wiring Recommendation for a 2005 Jeep Grand Cherokee
  • For trailer wiring you will need to start with the 4-way part # 118394 that you referenced. 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. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller...
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  • Will Installing a Trailer Wiring Harness Affect Alarm System on a 2005 Jeep Grand Cherokee
  • Installing Tow Ready trailer wiring harness # 118394 on your 2005 Jeep Grand Cherokee should not have any effect on the factory alarm. I have not yet heard of a wiring harness for any vehicle, including Jeeps, causing any issue with factory or even aftermarket alarms.
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  • Aftermarket Trailer Wiring for 2005 Jeep Grand Cherokee to Bypass Factory Wiring
  • Bypassing factory trailer wiring typically is a great way to avoid dealing with the headache of troubleshooting bad factory trailer wiring. So for your 2005 Jeep Grand Cherokee the easiest solution will be the Tekonsha Kit part # 118394 which installs by plugging inline with the vehicle taillight connectors to give you a 4-way. I attached an install video for this kit for you to check out as well.
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Info for this part was:

Expert Research:
Michael L
Expert Research:
Patrick B
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Video Edited:
Zack K
Video by:
Joshua S
Test Fit:
Nicholas E
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Isabelle B
Installed by:
Cole B

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