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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 # 118408
Retail:$93.34
Our Price: $71.44
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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 118408
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Tekonsha custom fit vehicle wiring for your are available from etrailer.com. Installation instructions and reviews for your custom fit vehicle wiring. Expert service, and great custom fit vehicle wiring prices. etrailer.com carries a complete line of Tekonsha products. Order your T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part number 118408 online at etrailer.com or call 1-800-940-8924 for expert service.
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Tekonsha Custom Fit Vehicle Wiring - 118408

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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. 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.



118408 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118408 Installation instructions


California residents: click here


Customer Satisfaction Score:


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118408

Average Customer Rating:  4.9 out of 5 stars   (119 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.

by:
2008 Jeep Commander

Just what I ordered and on time
Great
price



by:

No lame Covid excuses here! They are stocked with products & have employees who value their job. What a concept.
Couldn’t have been an easier experience with selection and I saved money.

Gordon

8/3/2023

Excellent



by:
2009 Jeep Commander

Correct product, shipped fast!



by:

One year later review. Everything hitch, wiring harness, receiver and ball even the rubber receiver cover are great. The product arrived timely and installed it with the help of floor jack (it’s heavy and I’m 69 yrs old) no problems. Holes were perfect and wire harness was plug and play. Very Happy



by:

I installed the wiring harness per instructions and ran the right side wiring in back of the hitch and zip tied it to the cross member. It isn't going to move or chafe at that point. I tested it on a test light and it works fine. I have it all buttoned up with no hanging wires. I did notice that there was no two sided tape provided as they had written in the instructions there would be. I provided my own.. and longer zip ties for the cross member. I also provided my own grounding screw as the one provided was short and the head wasn't wide enough for the ground connection. Other than that, it installed quickly.



by:
2010 Jeep Commander

The delivery of my hidden hitch trailer receiver, wiring harness, and hitch receiver cover for my 2010 Jeep Commander arrived quickly, the instructional on-line video was super helpful, and the installation was extremely easy. I am very pleased with the product and the customer service. Thank you.



by:
2006 Jeep Commander

I chose to use the OEM hitch and bezel for my Commander. I simply prefer the look. However, the OEM wiring is an absolute pain to install. It runs the entire length of the vehicle, and requires a computer flash from the dealer to make it work. I had the T-One harness installed in about a half hour, never used my wire stripper, and it works great. The kit looks to be of great quality, and the instructions were easy to follow. I would suggest a package of wire ties to secure everything. I finished off the installation with 30717 end connector. It mounted prefectly to the factory hitch, and gives an OEM look.



by:
2006 Jeep Commander

Super easy to install, more than enough wire to maneuver around obstacles. I would suggest having more zip ties on hand than were provided in the package. No issues with the 4-pole connector, I've had it attached to three different trailers and no problems. With other connectors I've had to mess with the pins to align properly, but not this one. Well done!



by:
2010 Jeep Commander

I shopped the online auto parts stores and called the Jeep dealer for a custom trailer wiring harness for my 2010 Jeep Commander. I found that the parts were either universal or too expensive. etrailer.com had the right part at the right price.

I decided to tackle the harness installation after watching the video that was provided in an email from etrailer.com. Installation from start to finish took less than 20 minutes. I even impressed myself with the foolproof installation.

This is the 2nd time that I have ordered parts from etrailer.com and it will not be the last. I can always count on etrailer.com for quality parts at a great price. The customer service is not too shabby either.



by:
2007 Ford Flex

I purchased the complete kit for my 2007 Commander.The Hitch was a breeze to install.I picked up 12' of 3/8' heat resistant flex tubing to protect and organize the wiring and with some extra cable ties had the whole job done in under to two hours.Great product.The order was shipped and arrived in under three days.The Communication was first class.I would recommend e trailer if you want to save on installation and do it yourself.You get the peace of mind that the job was done well.



by:
2007 Jeep Commander

I ordered a Hidden Hitch receiver and T-One wiring harness. Both were easy to install, good price, extremely fast shipping. The receiver was installed in less than 30 minutes, and the wiring harness in about 45 minutes. No problems, perfect fit.



by:
Jeep Commander

If you think you can hand wire a Jeep Commander and make it work...stop thinking and buy this wire harness. I tried to splice and hand wire the Jeep with no success. The brakes run separately from the turn signals on a Jeep Commander, which is why you cannot splice in trailer wiring. Simply plug in the wiring harness and presto, it works. Thanks eTrailer for the great value on this product.



by:

I couldn't be happier , easily installed very simple . Very good product



by:
2006 Jeep Commander

Super fast an easy instal



by:
2007 Jeep Commander

The trailer hitch and wiring arrived as predicted. Instructions were perfectly clear. Installation was a snap. Very happy withe the online service and products.

Sincerely,

Gene



by:

The easiest way to wire for a trailer hitch I’ve ever seen… No cutting and splicing wires no soldering just plug them in and use them thanks for the simplicity



by:
2007 Jeep Commander

Easy as pie, installed and zip-tied in 30 minutes. Unit should come with more zip-ties, I used about 12 ( maybe a few overkill ).

One thing I did was remove one of the 13mm bolts from the spare tire carrier to route the driver to passenger cable behind the metal carrier ( which follows the already present wire harness ). This made the install a little cleaner.



by:

This hitch and wiring harness I purchased from etrailer was a breeze to install. It took me 30 minutes to do it by myself and only took that long because I had to slide in some shims on the hitch. Great product, great service. Thanks!!



by:
2008 Jeep Commander

Before installation I watched the video which was more informative that the directions. The harness is easily installed by unplugging and plugging. I installed this harness along with a hitch and the whole job took about an hour. Works great and had fast delivery.



by:
2007 Jeep Commander

The wiring kit was very good quality and fairly easy to install. The only issue I had was the wires feeding over to the passenger-side light was too short. Actually, if you stretched the wiring straight across back of bumper it did reach. However, if you wanted to do a better job and route with factory taillight wiring it would not reach. I finally decided to splice in a section of wire and do the job right.



by:
2006 Jeep Commander

Product was a perfect fit for my nephews 2006 jeep commander., If you follow the instruction that were provided with the kit it is a very simple job even if you are not really a "car guy". The beauty with this harness is the simple "plug&play" and no need to cut into factory harness and has water tight almost factory like plugs.. I would recommend this harness even if you are going to have your mechanic install it he will Thank you.. Sincerely, Bill Jennings



by:

product working well. easy to install. took me 10 minutes. found it best to groung to black wire behind the light on the vehicle harness rather than with the body ground with the screw



by:
2007 Jeep Commander

What a great product. Took 10 minutes top to install and bought the 4 pin mount and it makes the job look like it was factory installed. Fast shipping and great products trailer is the place to purchase for sure.



by:
2007 Jeep Commander

Easy to install. Took about an hour including ripping out old harness that was hard wired into wiring.
Only complaint was the double sided tape was not in kit.



by:
Jeep Commander

The kit was complete with clear instructions. The instructions also included tips to help avoid potential pitfalls during installation. The vehicle I installed lights on was a Jeep Commander and thus was a little more complicated than most. Due to a good product and clear instructions, I was done in less than 20 minutes from start to finish.


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Show More Reviews

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

  • Is 4-Way Harness on 2006 Jeep Commander Compatible With Jet Ski Trailer Lights?
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118408 which fits your 2006 Jeep Commander will give you a 4-flat harness. A 4-way is a standard harness on trailers without brakes and it simply plugs into your Jeep's 4-way to power the trailer's lights.
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  • Troubleshooting Trailer Wiring on One Side of Trailer Not Functioning
    What you described sounds like a weak or bad ground on the right side of your trailer wiring. Each of the circuits on your trailer need to be grounded and the ground circuit on that side of the trailer is what all circuits you mentioned have in common. So try checking to make sure everything is grounding like it should. Sometimes lights ground through their hardware so if that's the case make sure they are connected to a clean metal surface. Or if the ground with a wire make sure it's connected...
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  • Trailer Wiring Harness for 2006 Jeep Commander
    Since your Commander didn't come from the factory with a 7-way trailer connector, you'll want to use the # 118408 that you referenced. If you click the provided link, you can see an install video showing the harness being installed on a 2006 Commander. If you don't already have a ball mount and trailer ball for your trailer, you can easily figure out the drop needed by looking at the FAQ article I've linked for you. The ball mount you choose will have the appropriate trailer balls listed...
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  • Is There Bumper Trimming Involved to Install the Curt Hitch # 13414 on a 207 Jeep Commander
    To install the Curt Trailer Hitch # 13414 on your 2007 Jeep Commander you will not need to trim or cut any section of your bumper or add any trim bezels. I attached installation instructions for this product for you to check out also. You also would not need to reflash the PCM of your vehicle either once you installed a Tow Ready Custom Fit Vehicle Wiring # 118408. You would have to reflash the computer if you were trying to install the factory tow package wiring harness on your vehicle...
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  • Troubleshooting 4-Pole Wiring Harness on 2007 GMC Sierra
    One of the most common causes for a 4-pole wiring harness to have one function not operate (or to operate weakly) is a bad ground connection. Since this is easy to check I suggest that you make this your first troubleshooting step. Check that the harness white ground wire's ring terminal is firmly affixed to a clean bare metal spot on the vehicle. If there is corrosion on the surface, grease or a build-up of road grime then there may not be a good enough ground connection to support all...
    view full answer...
  • Trailer Hitch for a 2006 Jeep Commander Carrying a Motorcycle
    Your Commander may have a hitch rated heavy enough to carry your carrier. You will need to check your owner's manual or inside the driver's door jamb to get the weight ratings for your Jeep. Check the hitch itself and make sure the tongue weight rating is heavy enough. If you cannot find these ratings your dealer should be able to help you with that. The 75338 Class III receiver hitch you have selected is rated for 500 pounds tongue weight. When deciding if you can mount your motorcycle...
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  • Wire Harness Recommendation For 2006 Jeep Commander
    For a 2006 Jeep Commander with no 7-way connector, I recommend the Tow Ready Custom Fit Vehicle Wiring, part # 118408. This harness easily connects to the vehicle wiring and requires no cutting or splicing into the wires. I have attached a link to an installation video for this harness 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 connections and helps prevent corrosion.
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  • Are There Instructions Available for Installing Trailer Wiring Harness on 2008 Jeep Commander
    Yes, I have linked instructions for the item you selected, 4 Pole Harness and Hardwire Kit, part # C59496. That being said, I'd recommend going with the # 118408 vehicle specific harness instead. This harness would require no cutting or splicing to install, which would be much easier and faster. You can see an install video and the installation instructions by clicking the provided links.
    view full answer...
  • Does Installation of a Class III Hitch on 2007 Jeep Commander Require Cutting the Bumper
    We do offer two different Class III hitches for your 2007 Jeep Commander and both can be seen on the link provided, including the Draw-Tite # 75338 that you referenced. I reviewed the installation instructions for this hitch (they are attached for your reference along with a video) and there is no mention made of any trimming of the bumper fascia. The same applies to the other two hitches offered. If you will be towing you might consider the etrailer ball mount kit # 989900 which includes...
    view full answer...
  • Recommended Trailer Wiring and Hitch for 2007 Jeep Commander Sport Rocky Mountain Edition
    The Tekonsha T-One Vehicle Wiring Harness # 118408 referenced in your question is confirmed to fit your 2007 Jeep Commander Sport Rocky Mountain Edition. There is not a fit exclusion with this particular trim package. The harness will work perfectly. It will install by plugging into factory ports behind the driver and passenger side tail lights to provide you with a 4-Way connector to power a trailer's basic signal lights. I have attached an installation video that you can use for reference. If...
    view full answer...
  • Trailer Wiring Harness for a 2008 Jeep Commander
    You will have to convert the separate circuits on the vehicle to be able to work with the combined circuits on the trailer. On the trailer, the left and right turn signals also have the brake light functions. Many vehicles have separate amber turn signals so a converter is required to combine the circuits. There are harnesses for your 2008 Jeep Commander that do not require any hardwiring, such as # 118408. But if you prefer to hardwire in a converter you can use # 119178KIT. On 119178KIT...
    view full answer...
  • Trailer Running Lights Not Working with Wiring Harness 118422 on a 2008 Jeep Commander
    Since the lights on the trailer work on a different tow vehicle, we can eliminate the trailer as the problem and focus on the wiring harness and the 2008 Jeep Commander. The running light wire on the harness is the brown wire. It is on the same side as the yellow wire which should be on the driver side of the vehicle. You can test the wiring harness using a circuit tester like # PTW2993. Do this test without the trailer connected. Turn on the running lights on the vehicle and use the circuit...
    view full answer...
  • Correct Curt Trailer Hitch Receiver for a 2007 Jeep Commander
    The Curt Trailer Hitch Receiver part # 13414 is indeed a fit for a 2007 Jeep Commander and it's available for purchase. It offers easy bolt-on installation and it has a hidden designed for the best overall look. I have attached an install video for you below as well. It should only take around thirty minutes. If you will be towing then you'll also need the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118408 which is plug-in-play and the etrailer Ball Mount Kit...
    view full answer...
  • Trailer Wiring Harness for a 2007 Jeep Commander
    If your 2007 Jeep Commander came with the factory tow package then it should have a factory 7-Way trailer connector at the back of the vehicle. You would follow this connector back to where it plugs in and that is where you would install # 118381. If there is no trailer connector on your Commander then # 118381 will not work. You would need to use # 118408 instead. I have linked the instructions and a video showing installation for you. Neither harness plugs into the back up sensor connector. I...
    view full answer...
  • Installation of Draw-Tite Trailer Hitch 75338 on a 2006 Jeep Commander
    You can find the torque requirements for Draw-Tite trailer hitch # 75338 in the instructions which I have linked below for you. We do not post them in case the manufacturer changes them. The instructions link though will always have the most up-to-date specs. 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,...
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  • Towing Capacity for 2006 Jeep Commander V6
    I looked up the towing capacity for your 2006 Jeep Commander with a V6 and it's 3,500 lbs without any additional components installed. If you need a hitch installed as well we have the Draw Tite part # 75338 which has more than enough capacity. For trailer wiring the part # 118408 will give you the easiest to install and most reliable kit. Since 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...
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  • Parts Needed to Tow Trailer With 2006 Jeep Commander
    We have everything you'll need to tow a trailer with your 2006 Jeep Commander. First thing you'll need is a trailer hitch which for that the Curt # 13414 is the way to go. it has plenty of towing capacity, the highest quality powder coat finish to resist rust, and installs very easily. I attached an install video for this for you to check out as well. For trailer wiring then you'd want the part # 118408 which installs easily and is also very reliable. I attached an install video for this...
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  • Converting a 4-Way Trailer Connector on a 2009 Jeep Commander to a 7-Way Trailer Connector
    Once you have the 4-way trailer wiring harness # 118408 installed you can use our # ETBC7 kit to convert it to a 7-way. The # ETBC7 also includes everything you need to install an electric trailer brake controller like the Prodigy P3 # 90195.
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  • Brake Controller and Install Recommendation for a 2008 Jeep Commander
    For a 2008 Jeep Commander that did not come with a factory installed 7-Way trailer connector, you will need a few items to install a trailer brake controller, but there isn't a plug in adapter available for your vehicle. First, if your Commander does not already have a 4-Way, you will start by installing one using # 118408. I have included a video showing a typical installation for you. Then you would need a 4 and 7-Way installation kit # ETBC7. This will provide the 7-Way and the wiring...
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  • Brake Controller and Trailer Wiring Installation On a 2007 Jeep Commander
    Yes, you can install the Brake Controller 7 & 4 Way Installation Kit, item # ETBC7, on your Commander as long as you install a 4-Way trailer connector first. The 4-Way wiring harness for your 2007 Commander is the T-One Vehicle Wiring Harness, item # 118408, and will be installed inline with the vehicles taillight connectors. Once you have the 4-way connector installed you will need to wire a brake controller, I would recommend the Prodigy, item # 90885, and the # ETBC7 kit. The blue wire...
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  • Brake Controller Wiring on a 2008 Jeep Commander
    A brake controller will have no effect on your vehicle's Electronic Sway Control and the Electronic Stability Program. Any brake controller will work with your vehicle and will need to be hardwired in to the existing wiring on the vehicle. If your vehicle does not already have a 4-pole wiring harness located a the back of your vehicle, you would need to purchase the following parts: A T-Connector part number 118408, a Brake Controller Installation Kit, part number ETBC7, and a brake controller....
    view full answer...
  • Trailer Wiring and Brake Controller Recommendation for a 2006 Jeep Commander
    I did some research on your 2006 Jeep Commander and it looks like when properly equipped it has a towing capacity of 6,500 lbs. So you should be just fine. You will want to consult your owners manual though just to be certain though. If you do not have trailer wiring on the vehicle you would need the part # 118408 to provide a 4-way. If the trailer has brakes then you would want to install a brake controller to allow you to actuate them and assist in the braking of the set up. From there...
    view full answer...
  • Trailer Hitch and Wiring for a 2008 Jeep Commander Rocky Mountain Edition
    Draw-Tite trailer hitch # 75338 is listed as a fit for all styles of the 2008 Jeep Commander so that would include the Rocky Mountain Edition. 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...
    view full answer...
  • Space Between Mounting Brackets on Curt Hitch 13414 for a 2008 Jeep Commander Sport
    I went out to the warehouse to measure the bracket opening on Curt trailer hitch # 13414 for your 2008 Jeep Commander. It is 2-1/2 inches. Draw-Tite hitch # 75338 comes with some extra washers if there is an excessive gap between the hitch and where it attaches to the vehicle so you might consider it. 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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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Andrew K
Video by:
Andrew K
Employee Kathleen M
Video by:
Kathleen M
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
Employee Chris R
Video Edited:
Chris R
Employee Nicholas E
Test Fit:
Nicholas E
Employee Matthew S
Test Fit:
Matthew S
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
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