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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  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 # 118426
Our Price: $69.17
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Custom Fit Vehicle Wiring

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Tekonsha Custom Fit Vehicle Wiring - 118426
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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 118426 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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Tekonsha Custom Fit Vehicle Wiring - 118426

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Tekonsha

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


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 4.2 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness.

T-One Connection Location Points Behind Tail Lights

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

Once installation is complete, the 4-way flat connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

ModuLite Powered Tail Light Converter

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

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

118426 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118426 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 - 118426

Average Customer Rating:  4.7 out of 5 stars   (148 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.

2005 Ford Escape

I installed this product on a 2005 Ford escape hybrid. It could not be simpler nor made any better. The fittings matched the Ford fittings perfectly, the instructions were very simple, and this is worth the cost! I’m very happy that I found this product on the Internet! Highly recommended!

2005 Ford Escape

I purchased a box hitch and wiring for my Ford Escape.
I did not install it but it went in without any problems and looks great.
I have used it for the last year without any problems at all.
The adapter slides in and out with ease so I can easily stow it away when not in use.
The extra cover on the end of the electrical plug is a nice touch.
I am 61 and this helps me enjoy my fishing boat that much more.

2006 Ford Escape

Everything needed to install trailer wiring on my 06 escape came ready to install. The instructions were easy and straightforward, making the whole thing smooth. Everything I expected and more. I highly recommend this product.

2007 Ford Escape

Great directions I have no mechanical ability and between the online videos/ paper directions I installed the trailer hitch and wiring. The huge positive being both work and I was quoted twice the price to have it done at different shops. Now I can take my recently purchased boat to the lake!!!

2005 Ford Escape

Life has been hectic for me since I bought and installed the Wiring Harness, and so the reason for not writing sooner. The item was exactly as shown and the installation was straight forward. The combination of the instructions and the etrailer You Tube video made the installation a breeze.
Once I had finished the install, I checked the wiring and all poles operated perfectly. One go at the install and, all was good to go.
I really do recommend this product.


Very good product, worked great for my application, quick and easy install.

2006 Ford Escape

I ordered the T-One vehicle wiring harness for my 2006 Ford Escape and received it within a few days. The harness was easy to install and works great!

Jeff S.


The Tow Ready Custom Fit Vehicle Wiring harness is still working great one year later!


This solved all my trailer light problems. Easy to install, the instructions were clear and concise, I am pretty much worry free about my lights

2006 Ford Escape

Fast and affordable

2005 Mazda Tribute

I installed this item myself all at the same time watching and pausing the video! No Problem. Product was sent on time in good condition, and I would order again! I would make a couple of recommendations that would make installation a little easier: 1) better wire connectors 2) better wire ties

Joseph M.


So far so good! Would order again! I could have never done it without the video!


Everything was included with good quality materials. There was a video on the eTrailer website that showed exactly how to install for my particular vehicle.

2005 Ford Escape

Arrived within 2 days. Everything packaged well and in great condition. Your site installation videos came in handy when I misplaced the instructions for the install. Will definitely buy from etrailer again.

Lewis S.



2006 Ford Escape

Installed this with no issues, was just slow going compared to installing the hitch this was more difficult. I used the online video for directions, the only thing that could have made it easier was in video be more clear as to what clips get connected where when installing on the passenger side. Also if the harness was about two inches longer on driver side module would have been easier to attach to frame as it was just a little short and made it difficult. I would have like red power wire to have been just a bit longer also to make it easier to connect to. I also installed the 4-pole flat mounting bracket along with the no-drill mount for bracket which made for a very clean nice looking install. Very happy with results, now I need to do some work on the trailer lights and I'm ready to go!

2007 Ford Escape

This is a great place to order from. You can actually talk to a person.
I ordered a hitch for my 2007 Ford escape. It fit perfectly took about an hour to install including wiring harness.


Had a hitch and wiring assembly installed last year and pulled a rental trailer from Nevada to Minnesota. Only problem I had was running out of gas because I was driving into strong head winds and gas station that was on my GPS was closed. Really satisfied with both the hitch and wiring assembly.

2006 Ford Escape

I install this wiring harness on my 2006 ford xscape xlt. I will go ahead and tell you now that when you go to put on the ground wire to sand the paint off behind the tail light. I did not do this first so when I put my ground wire on and when to go test the lights they did not work. After sanding a spot of paint off and reattaching the ground wire it worked great. took about an hour to install and was very explained in detail in the video. I've read some bad reviews on this and I've read some good reviews on this I've been using this product for about 2 months now and no problems yet. I hope I never have to replace this product.

2005 Ford Escape

This seems to be a good product. Everything is included for installation and the instructions are well written. I watched a YouTube video and followed the instructions. I'm not 100% sure if I have it wired right because I don't have a trailer to test it with. All the lights on the vehicle still work properly so I'm assuming everything is correct.

Etrailer Expert

Mike L.


We offer an inexpensive 4-pin trailer connector tester as part # F5CT that would work well for you.


The e-trailer wiring harness that I installed a year ago failed because the power-conditioner failed. U-haul wanted to fix it by splicing in a new one. I said that is not the right way to fix it, I'll just buy a whole new harness that plugs into the vehicle's wiring system. I got a new, heavier-duty wiring harness and it works perfectly, and only the power wire is butt-spliced. The support that Tommy at e-trailer gave me was right-on. Thank you e-trailer. By the way, their hitches are very easy to install, I've done two so far, but I've many pulling years ahead. Bruce A.

by: 04/15/2021

Overall, this is an excellent & high quality kit.
The only minor issues I had with my application was that the light housings on the Mariner are different than the Escape. The Mariner only has 2 light bulbs while the Escape has 3. But the etrailer wiring kit still worked, just had to use a different plug than as defined in the instructions.
Overall, an excellent product, especially for the price!


The trailer hitch fit perfect and I had good results with the coil wire that put the bolts into the frame.The wiring kit was easy also.I would recommend these products for the Diyers with mechanical aptitude.John in Customer Service was very helpful in answering all my concerns and put my mind at ease with purchasing these products and these products were very inexpensive.


I love etrailer! You guys are awesome! Thanks to George J for all of his knowledgeable assistance. Ordering was fast and easier than I had expected. I saved so much money buying through you guys over having that trailer rental place doing it! Your detailed diy video was invaluable. etrailer is my go-to for trailer wiring harnesses.
Keep up the good work guy!


The wiring harness for the trailer hitch that I received had a prong in the plug that had 2 prongs on the driver's side of the vehicle that was too short and was not making a connection. We had to cut off the old plug and splice that into the new harness for it to work.

2005 Ford Escape

I am pleased with this T-connector (and everything else I've bought from e-trailer). The installation instructions were OK but the e-trailer video on youtube was VERY helpful when I was actually installing the wiring harness. I could play and pause the video at each step, just follow along, and that went very smoothly. Thanks!

2005 Ford Escape

This seems to be the most complete and easiest to install powered trailer light converter that I can find. This is my third unit in the same vehicle...first one failed because I didn't adhere it to the side of the vehicle (my fault) failed after two years. The second one lasted over 4 years and only the left turn indicator failed. After checkinig all connections I was able to determine that it was the controller. Once replaced 10/28/2013 all worked fine.
Ordering from etrailer was easy and arrived in just a few days via ground.


Great company! Brenden made sure I got the right items I needed for my hitch and lights install. He also followed up to make sure I received the parts. Thank you, etrailer!
John F.

John F.



Show More Reviews

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

  • Troubleshooting # 118426 T-One Trailer Wiring Harness Installed on 2004 Ford Truck
    Good thinking trying the boat on another vehicle, that's a simple way to troubleshoot that most folks don't think about. You've pretty effectively ruled out the boat as being the problem. I'd begin by relocating the point where the white wire with the ring terminal from the converter box attaches to the vehicle. Make sure you're connecting to clean, bare metal with no undercoat or corrosion. If you've grounded the circuit to the chassis (instead of the frame) putting the ground screw through...
    view full answer...
  • Ford Escape tow package 2005
    The most economical and expedient way to handle this would be to return the harness you have, and install the T-1 connector, part number 118426. This connector simply plugs in behind the tail lights of your Ford Escape. You can certainly see the dealer for the relays if you wish, but they will probably be expensive.
    view full answer...
  • Does Tekonsha Wiring Harness 118426 Fit 2007 Ford Escape Hybrid Without Factory Tow Package
    Yes, the T-One Vehicle Wiring Harness # 118426 will absolutely fit your 2007 Ford Escape hybrid that does not have the factory tow package. The diodes that are installed on your Escape for flat towing will not affect the wiring harness or interfere with its effectiveness. I have added a link below to a video install on an '07 Escape for you to check out as well of the T-One Vehicle Wiring Harness # 118426.
    view full answer...
  • Troubleshooting Intermittent Trailer Tail Light Functions on a 2007 Ford Escape
    It almost sounds like your trailer is drawing a little too much for the Tow Ready Harness # 118426 and it stops working temporarily. Usually when this happens the converter box will short out altogether so I would not continue to do this until you get something else figured out. The maximum amperage for this unit is 2.1 amps per circuit on the stop/turn lights and 4.2 for the tail lights. This is not incredibly high so it is reasonable that you might be overdrawing the harness. You might...
    view full answer...
  • Left Hand Trailer Turn Signal Only Works with Right Hand Trailer Turn Signal
    If I am understanding you correctly then you are saying that the left hand turn signal lights on the trailer only activate when the right hand turn signal lights are engaged? If this is the case then it does not sound like a turn signal relay but rather corrosion on the trailer connectors or a bad ground to either the trailer connectors or lights. The ground issue is attributed to nearly 75% of lighting troubles so this would be the first thing I check. The lighting assemblies will be either...
    view full answer...
  • What Size is the Fuse Included with Trailer Wiring Harness # 118426 for a 2007 Ford Escape
    The fuse that is included with the trailer wiring harness # 118426 is a 10 amp fuse. I have included a link to the installation instructions and a video showing a typical installation for you. I have also included a link to an FAQ article with tips on routing the power wire to the vehicle battery.
    view full answer...
  • Troubleshooting Trailer Lights That Dont Work When Vehicle Headlights Are Switched On
    So, everything works fine until the vehicle headlights are switched on, is that correct? This typically means that there is a weak or insufficient ground connection somewhere in the system. On the vehicle, check the ground connection for the # 118426 converter. Make sure the ring terminal on the white wire is securely connected to clean metal. Make sure the ground wire on the trailer (usually connected to the trailer tongue) is secure and not corroded. Check your trailer lamps, which pick...
    view full answer...
  • Tekonsha Trailer Wiring Harness for 2005 Ford Escape
    The correct Tekonsha trailer wiring kit for your 2005 Ford Escape is the part # 118426 which is a confirmed fit. This would be most likely exactly what you have in your vehicle. You should go over your trailer wiring and try to fix any obvious shorts. These boxes don't normally go out without being shorted out.
    view full answer...
  • Can Trailer Wiring Harnesses Be Removed if the Vehicle will No Longer Tow
    If you no longer have a use for trailer wiring you could definitely remove the trailer wiring converter box. Especially if it's making funny noises like it's shorting out. Try un-installing the trailer wiring harness and see if your taillight issues clear up.
    view full answer...
  • Which Wiring Harness for a 2005 Ford Escape Hybrid
    The correct part number for a T-One Vehicle Wiring Harness with 4 Pole Trailer Connector and powered converter is #118426. I do not show a part for the part number you mentioned. The T-One wiring harness will be installed inline with your 2005 Escape Hybrid taillights and you will run a wire with inline fuse to the battery to power the taillight functions on the trailer and protect sensitive wiring and electronics.
    view full answer...
  • Trailer Wiring Kit Recommendation for 2006 Ford Escape
    For trailer wiring for your 2006 Ford Escape you would want the Tekonsha kit part # 118426 which is a confirmed fit. I attached an install video for this on a similar 2006 Escape as yours too.
    view full answer...
  • Trailer Lights are Dim Just on One Side of Trailer
    Many times the issue with a dim light on one side or the other is caused by a poor ground connection. You will want to inspect all of the ground locations as well as the ground wires coming from each light. Check for loose connections or pinched or bare wires. If the lights on your trailer use a plug-in style pigtail harness look for damaged or bent pins. If you have an aluminum trailer, make sure you have a ground wire run to all of the lights from the ground wire on the connector. If...
    view full answer...
  • Troubleshooting Trailer Left Turn Signal Not Functioning on a Ford F-550
    First thing you should do at this point is test the 7-way of the wiring harness with a circuit tester part # 3808 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean and...
    view full answer...
  • What Causes Trailer Wiring Harnesses to Short Out
    Most likely your old harness shorted due to a short on the trailer wiring and that is why it got damaged and needed to be replaced. Since you replaced the wiring of your trailer you should be good now. Sorry to hear about the problems you had with your trailer wiring, but the good news is the converter box did it's job. It is supposed to short out and act as a fuse in the event of a short on the trailer wiring to prevent the short from damaging your vehicle wiring. If you have any other...
    view full answer...
  • Repeat Malfunctions with a T-One Harness for a 2007 Ford Escape
    It is possible, though very remote, that you had two faulty units. However, having two units back to back that die that quickly leads me to believe something is going on with the trailer lighting and wiring. I wonder if your trailer is demanding more power than the Modu-Lite can provide and is burning up the boxes and causing malfunctions. First check to make sure the fuse in the fuse-holder is still good. How many lights are on the trailer? Side markers and tail/turn/brake lights? Check...
    view full answer...
  • Troubleshooting Dim Lights on Trailer
    If you are certain the grounds on your trailer are fine, there are some other areas you can check out to fix the dim lights on your boat trailer. Normally, LED lights will not dim so I recommend you start at your connector to ensure all the connections are secure. You will then want to trace the wiring from the dim lights to ensure it is not crimped or somehow damaged. I've added a link to a help article on troubleshooting trailer wiring which you should also find useful.
    view full answer...
  • Trailer Wiring Parts for a 2006 Ford Escape
    Trailers, in essence, directly connect to the vehicle wiring. If your Escape was not built with a tow package from the factory, it will not have the necessary converter that combines brake light and turn signal lights on the same circuit. The 2006 Escape has amber turn signals and red brake light, whereas a trailer will have one red light that does both. If your Escape does have a tow package, you would use connector part # 40455. The converter is wired into the vehicle. If you do not...
    view full answer...
  • Recommended Trailer Wiring Harness For 2005 Ford Escape Without Factory Tow Package
    It sounds like your Escape is not equipped with the Tow Package even though the connector is still there. The correct wiring harness you need for your Escape is the T-One Vehicle Wiring Harness, part # 118426. This harness will plug into the back of your taillights and the hot lead wire must be run to the positive battery post at the front of the vehicle to power the trailer lights. This harness has a Modulite which protects the tow vehicle from any electrical shorts or any wiring problems.
    view full answer...
  • Both Turn Signals Illuminate on Trailer with Only One Turn Signal Applied
    The issue you described is most likely attributed to a poor ground. This poor ground can be on the taillight assemblies themselves or on the trailer connector. If the taillights ground with a single wire then I recommend removing the ground for both as well as the trailer connector ground and then running them to a single point on the trailer frame that is a bare metal surface free of any paint. If the lights ground via the mounting hardware then remove the lights, sand down the surface,...
    view full answer...
  • Recommended 4-Way Trailer Wiring Harness for 2019 Jeep Grand Cherokee
    Since your 2019 Jeep Grand Cherokee isn't equipped with the factory US Car connector under the bumper then your best option for adding the needed 4-Way harness is with the Tekonsha T-One # 118727. This is still a custom harness that installs by simply plugging into factory ports behind the driver and passenger side tail lights (you will need to remove the tail lights to access the harness). Then as you mentioned, the hot lead will need to be run up to the Jeep's battery. When this type...
    view full answer...
  • Troubleshooting Trailer Wiring on a 2008 Mercury Mariner
    If you tested the wiring on your 2008 Mercury Mariner and it is operating properly but then when you install a wire converter unit the 4-Way flat connector isn't operating properly then yes, I would say that is an indication of a faulty converter/ModuLite wiring unit. In this case I recommend replacing your wiring with the T-One # 118551 as it sounds like you don't have the factory tow package. I really like the Tekonsha wiring kits because we tend to have the fewest amount of troubleshooting...
    view full answer...
  • Best Trailer Wiring Harness for 2007 Ford Escape without Tow Package
    The best trailer wiring kit we offer for your 2007 Ford Escape that does not have the factory towing package is the Tekonsha part # 118426 as it has the most reliable converter box and the easiest install. The other options are a bit more prone to shorting out in the event there is a trailer wiring short.
    view full answer...
  • What Parts are Needed to Wire a 2007 Ford Escape to Tow a 4-Way Trailer
    On the 2007 Escape, a converter must be used. We offer a custom fit harness, part # 118426, that converts the 4 wire system on the vehicle to a 3 wire system for the trailer. This harness also includes a power line that attaches directly to the vehicle battery. This allows the converter to power the trailer lights with a direct battery feed, rather than drawing power from the Escape tail lights which can be a problem in the event of a short circuit.
    view full answer...
  • Troubleshooting Left Turn Signal on Boat Not Working All the Time When Towing with 2007 Ford Escape
    If your left turn signal on your boat trailer works intermittently when towing with your 2007 Ford Escape then you'll want to check your connections where your wiring, like the T-One # 118426, tees in as well as any grounds that harness may have. Make sure the connectors are clean and solid and that your ground is connected to a clean, bare-metal surface.
    view full answer...

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Info for this part was:

Employee Mike L
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Mike L
Employee Robert G
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Robert G
Employee Patrick B
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Patrick B
Employee Michael H
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Michael H
Employee Jeff D
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Alexander C
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