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  1. Custom Fit Vehicle Wiring
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  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118551
Retail:$118.10
Our Price: $74.53
You Save: 37%
Custom Fit Vehicle Wiring

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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Custom Fit 118551
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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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118551 or order online at etrailer.com. 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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Tekonsha Custom Fit Vehicle Wiring - 118551

  • 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.


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: 4.2 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 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 either within your rear cargo area or beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure if you are mounting it near the hitch.


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.



118551 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118551 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 - 118551

Average Customer Rating:  4.7 out of 5 stars   (579 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.

by:

Sadly the harness quit working after about 6 months. I was really hoping to get a little more life out of the harness.

Etrailer Expert

Jenny N.

2/26/2024

I am sorry to hear thar wiring harness is not working. A lot of the time the ground can because loose and if redone can fix the harness. I have a FAQ below that explains the other options to check with it.



by:
2010 Lincoln MKX

The products look good and installed just fine. I towed my boat (about 2,000 lbs) one time with it before I blew the engine on my 2010 Lincoln MKX. My advice is make sure you have a good oil, cooler and transmission cooler and even then you never know with a used car.



by:

Since I'm electronically challenged I am always a bit apprensive when it comes to electrical wiring. After watching your install video it was such an easy thing to do! Plug-n-play! The hardest part was fishing the hot wire up to the battery. (not the wire but getting my body to fit under the car. It took me about 45 minutes from start to finish. I have a small trailer that I will use from time to time so I needed a to install a receiver hitch ( 13650) and wire harness. This fills the bill for me!

Randal

7/14/2020

Still going strong!!



by:
2010 Ford Escape

I purchased this wiring kit along with a trailer hitch and have to say this wiring kit and instructions were real nice. High quality product that went on easily. Took about an hour to install and test. Worked wonderfully and the cost was real competitive. I would highly recommend this product and eTrailer.com for your trailer hitch needs. Great company to deal with from ordering on line to follow-up after the sale, just a great company to work with.

Van J.

6/18/2016

Love the hitch and wiring, use it all the time. Just hauled the trailer 159 miles last weekend and everything works well. Very happy.



by:
2011 Ford Escape

I am new to car mod-ing and are very inexperienced when it comes to knowing exactly what product to get. This is where etrailer was pretty helpful. The videos are very helpful. The hitch was made to fit my specific vehicle (2011 Ford Escape). I also purchased the specific wiring the site said I needed due to having backup sensors on my vehicle.

However, after successfully installing the hitch, we realized there was a problem with the wiring. The yellow/black wires are meant for the driver's side taillights while the green is meant for the passenger. I'm not sure if I was sent the wrong product or if there was a manufacturing error, but the lengths of wire for each were switched.

The shorter length wires should have been the yellow and black while the long should have been green - instead, they were the opposite, as you can see in the pictures. The black box on the right is meant to be housed in the driver side light assembly, not the passenger. Because of this, I was forced to find a long white wire, fuse it with the ground wire that was supplied, and run it back across the width of my vehicle to the factory ground. While it seems like this won't be an issue, it was very annoying having to alleviate this problem.

Everything else seemed to be correct with the wiring and included items, but I would recommend that everyone inspect your order and watch all videos to make sure your product looks to be correct before attempting to install it.



by:
2008 Lincoln MKX

Exact fitment of the harness to the lights and the installation was easy. The etrailer.com video was an excellent tool to use as it clarified certain steps in the provided paper instructions......Thanks etrailer.com. The T-one harness is just the opposite wiring set-up of the harness that is used in the video. I was able to use an existing floor body grommet plug to feed the black 12 gauge hot lead wire under the car(I drilled a 9/64th hole in the rubber grommet plug and feed the wire through the drilled hole). Running the hot lead wire to the front of the vehicle took some time (recommend ramps for better clearance). Hook-up of the fuse line and battery connection was elemental. All parts provided make the installation process very easy. The T-one harness is powering the trailer lights perfectly.



by:
2012 Ford Escape

At the same time as buying a hidden hitch, I bought the wiring kit as well. We watched the installation video, which was a big help, but we had to change the threading of the wiring to the front a bit since it wouldn't pass through one of the places shown in the video. Other than that, it went better than any other wiring job we have ever done and looks like a pro did it. We did not leave a pig tail wire to wad up and have to store like it was shown, but made a permanent hook-up at the hitch which looks much nicer.



by:
2010 Ford Escape

Bought with trailer hitch -2010 Escape- Good directions. Installed myself and used setup for 2k mile trip towing a Uhaul rental. Good security having the trailer wireing isolated from the auto circuitry. Web site insured I got the right product.



by:

I will never deal with this company again. Delivery was extremely late. Tracking was impossible to find where it actually was. When I asked to get my money back they said since it was already shipped I had to wait till it arrived and then pay for it to get shipped back. I had to pay for the product to get over the boarder. I will never use this company nor will I tell someone else it's a professional establishment.

Etrailer Expert

Katrina B.

5/22/2023

I am sorry about the confusion. For shipping to Canada, you will have to keep in mind that the quoted shipping costs does not include all brokerage fees and duties. Taxes are not included. All prices on our site are in US Funds. Your credit card company will convert the US charge to Canadian. This should have been stated clearly to you, and I am sorry if it was not. As for the delay in shipping time, if you are needing the product at a specific time frame, you should always use expedited shipping [especially when shipping internationally].



by:
2012 Ford Escape

The kit is actually really easy to install. I was fussing around a little with feeding the wire back to the battery. I watched the video on it probably over a week before ordering. If you take your time, it can be routed, but I saw all the tie straps and figured strap it to everything they say to avoid instead. Lol I didn't have to drill a single hole with my 2012 Escape. The weather stripping is so thick. No exposure to weather for the 4 pin. Made more sense than not putting it in the side holder when not in use. The power pack sticks behind a trim panel too.



by:

Tow hitch for '12 escape. Works awesome! Was tricky to install by myself, but figured out a way(all the videos showed a 2-man install). Easy to wire up. I use it almost daily.



by:

Installed and working great!



by:
Ford

Works great. One fitment note for ford Vans with rear A/C. the A/C panel does not come off. Its Hot riveted in place. So you have two options. Pull seats and trim all the way out. Or break the panel off. I broke mine. the rivets broke easy and after install clear silicon re-attached the panel. I routed the 4 prong down the tire anti-theft plate. Making the install clean.



by:
2008 Ford Escape

Easy install. Wire harness is completely inside vehicle and stored in the jack compartment easy access.



by:

Trailer harness is working great after 1 year. Installation instructions and video were easy to follow. Very pleased!



by:
2011 Ford Escape

I ordered a # 118551 harness for my 2011 Ford Escape and It was easy to install with the instructions and the video links that were available. 5 stars



by:
2008 Ford Escape

I was a bit hesitant when it came to ordering the special harness for the Escape equipped with backup sensors (3x the price of the basic one & 3x the work to install), but it was pretty much confirmed: the non-towing equipped harness isn't designed to handle the extra load of trailer lights - so this kit gets it power from a beefy lead connected directly to the battery.
I have to say that crawling under the car, running this power lead from the d/s taillight to the battery was the biggest pain of the whole job - including installing the receiver, but I didn't have a choice.
etrailer's how-to video proved to be invaluable and a time-saver. Seeing the actual installation on my specific vehicle was huge. I used the video as the manual and read the manufacturers directions as backup.
Kudos to etrailer for putting together these videos and learning about the products that they sell.
Kind of like the Crutchfield of trailers, only better.
On another note, I inquired about shipping time and received a prompt email reply with a note about etrailer making sure that my receiver and harness would be shipped a.s.a.p. - which it was.

Jptl

2/4/2015

I really cant provide a one year later review - not because I sold the vehicle, but because it is now my daughters car and she never uses the vehicle to tow. She only uses the receiver for a Yakima bike rack. I believe that the finish on the receiver has held up well as the car has endured harsh elements here in the DC area they like their salt - especially this winter. Id be happy to take a look at the finish of the hitch in the Spring if you remind me to do so.



by:
2012 Ford Escape

A true "Plug-and-Play" harness that was easy to order, came to my door quickly and best of all was easy to install on my 2012 Ford escape. I'm not an electrical person at all and considered taking my car to the dealer, when I saw the price they wanted, more than $500, it was a no brainer. I was initially worried about installing it myself, but looking it over and looking at the simple instructions that included photos, I did it in about 3 hours, again, I took my time, took a lot of breaks, and did a lot of extras like my own larger zip ties, dielectric grease, hiding all the wires, mounting the 4 pin to 7 blade converter female end electric connection to the hitch, etc... It all worked perfectly! My only complaint, if you really want to call it that, is that the tiny zip ties provided are nowhere near what is needed to do the job right, get a pack of larger zip ties, ones that are about 10 inches long, before installing this harness, it will make it SO much easier and look SO much better.

Dave

6/22/2017

After a year its all good! It all works perfectly and still looks great. Im not worried at all when we plug in the trailer and do a light check. If I can do it, anybody can do it, its that easy.



by:
2009 Ford Edge

Nothing but props for the folks at etrailer. My hitch receiver for our 2009 Ford Edge arrived a day earlier than I had expected. First time installing one of these and it wasn't too bad but would have been way better with a second set of hands. Got it all in and lined up only to discover one of the rectangular washers was missing from the hardware kit. Fearing the worst, I sent them an email and to my surprise I got an answer within 30 minutes on a Saturday no less. No hoops to jump through or long drawn out procedures. They got my part ordered to ship out and it was here by midweek. Great customer service is what it's all about. Problems arise but the true colors come out by how a company chooses to respond to even a little thing like a missing washer. Thank you etrailer! You have my business again when it's needed and I'll be recommending you when friends ask where to go.

David P.

12/31/2021

Not Surprisingly the hitch and wiring have worked flawlessly. Very pleased with this product!



by:
2010 Ford Escape

I have installed this Harness in place of a harness that I purchased that I purchased from eTrailer two years ago. As I have just installed this all I can say is that so far it works as it is supposed to. My hope is that it lasts longer than just two years. My tow vehical is a 2010, the first harness was dealer installed and it lasted about sixteen months, with both failures, I checked the trailer wiring and found no problems and in each case the harness failed without the trailer being connected. So I do hope that you have corrected what ever the problem was as I am getting tired of paying out $70.00 every two years for something that should last much longer.

Jeff C.

12/18/2015

I had exactly the same experience. It all worked fine after I installed it and then some months later when I bought a trailer and hooked it up, it was dead. Never did get to use it. Now I have to take everything apart and remove the harness. I dont plan to put in another one.



by:

I am still happy with the purchase of the vehicle wiring harness. It is performing very well and the wiring is holding up to the elements such as road salt, moisture, and grime.



by:

If you have the option to use one of these custom fit kits for your trailer or tow vehicle wiring or both, don't hesitate to purchase. These kits make wiring a snap and both can be used in series if necessary without cutting or splicing any factory wire. I used this in comping with a Hopkins kit for my towed vehicle with no issues.

Great P.

9/20/2020

Great



by:
2013 Ford Van

Like the harness but confusion on the colors from the video to the instructions. After install, I had to switch the wiring left to right. But otherwise great.



by:
2014 Ford Van

Easy/extremely frustrating install. I set-up my laptop in the back of my van and watched etrailer install video, I paused/played through each set of the install. The install instructions are very vague. Watch the videos! 90% of the install was easy, because of video. Unfortunately running the wire from the module to the fuse panel was very difficult without having the ability to elevate the vehicle. Running the wire along the open frame rail was 20 min. Next came the boxed portion of the frame, it took several hours to the wire and the wire-fish through this portion. If I was standing, and could see the obstacles in box frame it would have went a lot quicker. Overall this install was smooth, and a lot cheaper than having a shop charge for labor-time.

Jersey J.

9/28/2016

Working out great!



by:
2009 Mercury Mariner

Very easy to install on my 2009 Mercury Mariner. Everything required was included. The only "difficult" part was running the wire from the rear of the car to the positive terminal of the battery. The wire was plenty long enough and more than enough wire ties were included for the job. I took the rear bumper off which made running the wires between the rear lights and the module much easier.

John K.

8/20/2019

It was working fine. We have since sold the car. Now, since I had such great results, I have to buy a hitch and adapter for my new car.


25
579
Show More Reviews

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

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    My suspicion is that you have a poor ground connection somewhere on your trailer. The fact that everything works fine until the running lights are turned on is the dead giveaway. When the tail lights are turned on, the trailer lighting is drawing maximum amperage through the system. If there is a ground problem, this is when it will manifest itself. There are several places to look for a poor ground connection. Lets start with the trailer connector on the vehicle. Trace the white wire...
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  • Low Voltage on Curt Wiring Harness When Lights On
    What you are describing seems to be common in some Curt trailer wiring harnesses that use a powered converter. If you were to pull the fuse out of the fuse holder it should not show power any more (with the vehicle on or off). It sounds like you have a weak ground, loose butt connector or perhaps a crimp in a wire. Check all your ground wires to verify they are securely attached to a clean, bare metal surface. These checks should include the ground connector on the tow vehicle, the ground...
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  • Do Taillights on Vehicle Have to be Functional for Trailer Wiring Harness to Work
    For a trailer wiring harness confirmed as a fit for your 2008 Ford Escape we have the Tow Ready part # 118551. If the taillights on your vehicle aren't currently working I cannot guarantee this kit will work since they will need to be functional. Have you tried checking the bulbs in the housings of your vehicle? You can also try checking the fuses for the lights on your vehicle as well.
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  • Trailer Wiring Recommendation for 2007 Ford Edge
    We have trailer wiring that is a confirmed fit for your 2007 Ford Edge but it does not tie into the factory wiring you mentioned. Instead you'd want the Tekonsha part # 118551 which is a fit for your vehicle but plugs inline with the taillight connectors of the vehicle.
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  • Does Hot Lead for Wiring Harness on 2007 Lincoln MKX Have to be Run to Battery
    We get asked this question pretty regularly and the answer is you must run the hot lead to the battery when installing a 4-way, in your case the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118551 for a 2007 Lincoln MKX. The reason is this is the only way to ensure your car's wiring is not otherwise affected. You can run the hot lead from your battery in any manner you see fit, you are only limited by how much you are willing to create holes to run the wiring. I have...
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  • Why is a Hot Wire Needed for Trailer Hitch Wiring On a 2009 Ford Escape
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  • Where Does a Trailer Wiring Harness Install on a 2012 Ford Escape
    In order to install the Tow Ready Custom Fit Vehicle Wiring, # 118551, you actually have to remove the tail lights to gain access to the wiring that goes to them. The harness has connectors that plug in line with the tail light wiring. I've linked a video that shows the install, as well as the installation details.
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  • No Metal Pins in Fuse Box for Trailer Towing Relays On 2011 Ford Escape
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118551 is a confirmed fit for a 2011 Ford Escape without factory tow package so this is what you'll want to use. The models without factory tow package will still have a plug for the wiring under the bumper but the circuits are not active and there are no terminals in the fuse box to attach the relays. I am not sure why you already have a wiring connector but it could have been done by an old owner who was not aware...
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  • Trailer Wiring Harness for 2011 Ford Escape
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  • Can Two 4-Way Connectors be Used on 2009 Ford Escape
    I was unable to find any type of reference to a wiring harness with the part number of 58592; however, yes, you would be able to also use the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118551 on your 2009 Ford Escape. I have added a link to a video for you to check out as an example of how you would go about doing this which you can see at about the 2:00 mark.
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  • Trailer Wiring Recommendation for a 2011 Ford Escape
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  • Trailer Lights Come On and Off Randomly After Rain Storm On 2012 Ford Escape
    The issue you are having with your trailer lights sounds like the converter box is bad and will then need to be replaced as these cannot be repaired. The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118551 is what I recommend using as it is the most reliable option we have for a 2012 Ford Escape. If you wanted to be sure the converter box was the issue then all you need to do is take a circuit tester and test the wires leading into the box and then leaving the...
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  • Fit and Compatibility of Tow Ready Wiring Harness on a 2008 Ford Escape
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  • Will Hitch and Wiring for a 2008 Escape Hybrid Fit a 2009 Ford Escape Hybrid
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  • Troubleshooting Trailer Wiring on a 2008 Mercury Mariner
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  • How To Install T-One Vehicle Wiring Harness 118551 On 2010 Ford Escape
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  • Trailer Wiring Harness and Install Video for a 2011 Ford Escape Hybrid
    Yes, the install video that shows the Tow Ready Wiring Harness part # 118551 being installed on a 2008 Ford Escape Hybrid that I attached will also apply to your 2011 Ford Escape. I also attached an install video that shows this harness getting installed on a 2011 Escape for you to check out as well.
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