/
Tekonsha/
Custom Fit/
Trailer Hitch Wiring/
4 Flat/
Powered ConverterItem # 118551
Retail:$82.12
Our Price: $49.95
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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.
Features:
Specs:
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.
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.
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.
Installation Details 
2007 - 2008 Ford Edge
2007 - 2010 Ford Edge
2008 - 2012 Ford Escape
2005 - 2011 Mercury Mariner
2007 - 2010 Lincoln MKX
2007 - 2010 Lincoln MKX
2008 - 2011 Mazda Tribute
2008 - 2014 Ford Van E-150
2008 - 2014 Ford Van E-250
2008 - 2014 Ford Van E-350
2009 - 2010 Ford Edge excluding Sport
2009 - 2010 Ford Edge Sport
2008 - 2012 Ford Escape without factory tow package
2005 - 2011 Mercury Mariner without factory tow package
2008 - 2011 Mazda Tribute without factory tow package
2008 - 2014 Ford Van 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.
Speaker 1: Today, we're going to take a look at the T1 vehicle wiring harness with the four-way flat trailer connector. Now, this is a custom-fit part. It is designed to fit 2005 to 2014 Ford Lincoln, Mercury, and Mazda vehicles. It fits many vehicles in those brands, so what I would recommend for you to do is go to our website, use our fit guide, put in your year and model vehicle, and it'll show you if this will work for your application. Now, this provides this four-way flat trailer connector at the back of your vehicle to power your trailer's signal lights. It is compatible with five-pole, six-pole, and seven-pole adapters, that we do sell separately on our website.This harness does connect very quickly and easily.
Basically, you just locate your connection points, which will be behind the tail lights. Plug in these T connectors, one on each side of the vehicle. Ground your white wire, and then your black power wire here will run to your vehicle's battery. This harness includes this black box, which is a modulite. This is to ensure that your vehicle's wiring will match that of your trailer.
It is a power module, so it connects directly to the battery to avoid overloading your vehicle's electrical system. The wire that runs out the back that the four-way's connected to, it's constructed of a 16-gauge bonded wire. If you notice, has this integrated dust cover for your four-way. What's nice about that is when you're not plugged into your trailer, you can put that over the terminals to protect it from the elements or from any damage.A few specs on this harness. The maximum amperage is ...
on the stop and turn light circuits is 4.2 amps per circuit. On the tail lights is 7.5 amps per circuit. This part includes everything laid out here on the table, even has a nice set of detailed instructions that describe how to install it, with pictures of where your connections are to be made. Basically, just to go through this briefly how this connects, what you'll want to do again is go to the back of the vehicle. Locate your connection points, which will be behind the tail lights.
You'll want to start on the passenger side and take this T connector, it has the green wire in it, unplug your harness from the tail lights, plug this in between the harness and the tail lights. Then what you want to do is take the other T connector, that has the yellow wire in it, that's for the driver side. Run that over to the driver side, same way. Plug in this T connector between the harness and the tail lights.Now, your modulite box here, you do want to attach that to a good, flat surface so it doesn't bounce around. They do include a bracket with a hole in it that you could put a screw in. They also include a piece of double-face tape that you can use to hold it into place, but you do want to attach that down. Once that's all attached, you'll take your white wire that has the eyelet on it, that needs to connect to a good clean ground. Then the remaining wire is your black power wire. That'll run to the front of the vehicle, to the battery. To do that, they give you a length of wire and some connectors. You'll take on of your butt connectors, put on the power wire, connect it to one end of this length of wire, run this all the way to the front. When you get to the front, you don't want to connect this directly to the battery. You want to run it through this in-line fuse holder.Take the other butt connector, attach it to one end of the fuse holder, just like that. Your other end of the fuse holder, you'll take this eyelet connector, attach that, and this is what'll connect to the vehicle's battery. Once that's connected, pop open your fuse holder. Take your included 15-amp fuse and go ahead and just install it into your fuse holder. Oops. There you go, just like that. Once you get it all installed, just go ahead and put your cover over that. Once you get that all attached, you'll be all ready to go. Now, they do include some extra cable ties to take up any length in the wiring. They even include this extra grounding screw if you need to make your own ground, if there wasn't one nearby, you can make your own ground with that screw. That should do it for the review on the T1 vehicle wiring harness with the four-way flat trailer connector.
Average Customer Rating: 4.8 out of 5 stars (407 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.I ordered the wiring kit for my van . First thing in got delivered in 3 days and it's a very good kit very user friendly 592460
My installer explained that this wiring package is a bit involved, but after looking at the online tutorial, he certainly should not have any trouble. 435830
Perfect. No complaints whatsoever!
Tony E - 09/23/2018
Right turn signal isn't coming out of the black box of the trailer wire harness. The signal is reaching the black box. Appears the black box is the problem. This happened after approx. 9 months from installation. Used the vehicle to tow a trailer around 30 trips. Not happy about that. Installation was easy and the directions were helpful. Overall I would be extremely satisfied if I didn't have the turn signal issue. 523093
Given what youve described, it sounds as if the converter box has shorted out. This is typically caused by a short circuit somewhere in the right turn indicator/brake lamp circuit on the trailer. Before replacing the taillight converter, youll want to closely examine the right turn/brake lamp circuit on your trailer. Begin at the trailer connector, and trace that circuit rearward back to the lamp. Look for loose connections, pinched wires or worn or cracked wire insulation that would allow the wire to short out on the trailer frame. If the short isnt located and repaired, youll continue shorting out converter boxes. Ive linked to some help articles that will help you troubleshoot the problem.
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Mike L - 06/18/2018You will need a hour to install the wiring kit. The kit only includes a very few of the teeniest wire ties that exist on earth. I would expect that the teeny wire ties would break in a short amount of time. In reality, you will need at least 30 heavier and longer wire ties to neatly tie off all sags of the main wire from the engine compartment back to the hitch, then along the hitch itself. Be sure to tie off that square wire junction box in case the double sided tape fails. I stuck mine on the far left side of hitch. The instructions failed to say that all wiring splices should be wrapped with electrical tape or shrink tubing. 140121
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. 553990
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. 93210
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.
JPTL - 02/04/2015I 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. 420128
This is a five star review. This product was exemplary. A couple minor criticism. The batter terminal connector was not shrink. The 4-wire connector could be a bit longer. It was long enough. If you find someone who really likes to wire it to perfection it is just barely long enough. It does clip over the chain area as depicted. I think they made the power wire longer, from the looks of it compared to the videos, but it's still not quite long enough for perfectionist wiring in a bus frame. It probably isn't long enough at all. We used about 4.5 feet more. Finally, the gauge of the power line is not detailed in the product description it is 12 gauge. Do not purchase 16 gauge wire for this application, lol. 406443
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. 202262
Love the hitch and wiring, use it all the time. Just hauled the trailer 159 miles last weekend and everything works well. Very happy.
Van J - 06/18/2016Easy to install and working great! 127536
Quality product, still working great!
Larry T - 04/26/2015I have had this setup for about a year on my Ford Escape. It was super easy to setup and it is super reliable. I’m usually using a trailer every other week and it has not failed me. 10/10 571054
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. 133277
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.
-- comment by: Jeff C - 12/18/2015I installed The T-One wiring harness. The only issue I had was i had to move the box from the drivers side over to the passenger side due to the wiring for the green wires being to short. Once I did that, the installstion went smoothly. The hardest part of the install was running the primary wire from the lights to the battery due to me working without a lift. I would certainly recommend these products to others due to there ease of installation and easy access to support how2 videos. 543458
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. 555063
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. 228354
Working out great!
Jersey J - 09/28/2016Easy install. Wire harness is completely inside vehicle and stored in the jack compartment easy access. 373779
I salvaged a hitch off of a vehicle of mine but noticed that the vehicle wiring has changed quite a bit so buying this kit was the most logical way to proceed. The two things that I appreciate the most are that the kit is complete, I didn't have to go buy more parts to do the installation, and etrailer provided a video showing the path that their installer chose for running the hot wire from the back of the van to the front power source. This is important because there is only 20' of wire for a 16' long vehicle and I didn't want to have to go buy more wire. Ultimately, I will add a 7 pole female adapter and trailer brakes and etrailer has a 7 pole adapter that will make that easy. 575158
Replacement to my existing setup that was blowing fuses. This one kept blowing fuses as well. Turns out, there was a short on my trailer. 550761
What you describe is a very common occurrence. The majority of the time, problems with a taillight converter will be caused by a short somewhere in the trailers wiring.
-- Mike L - 08/07/2018This wiring kit was plain and simple. Complete instructions. And lots of wire ties. Very good overall. 660896
The wiring harness was easy to install and it was very helpful to have the video tutorial to view for tips and tricks! Thank you etrailer for having a consumer friendly service for the DIY crowd. The customer support staff were also extremely courteous and helpful! I had also purchased the Draw-tite trailer hitch and everything was included that was necessary for a successful installation. Thank you etrailer. 660546
easy installation. has everything you need other than a few simple tools. toook me about an hour to install. 659021
Very pleased with the whole process. This is the second or third time i have used etrailer. Easy install using the videos. Products are as described and work very good. Over all an AAA+ experience again. Defiantly will use them again for my next vehicles 658435
Very easy to install. I replaced another brand that had seen it's better day. So NO 12 wire needed to be routed to the rear from the front as one was ALREADY there in place. The rest was very easy. 647762
I consider this a solid product for a good price. I found the instructions easy to follow. After 1 year everything is functioning as good as day one. It is truly refreshing to deal with a company that provides a quality product and quality customer service. I wish everyone did it like etrailer. 644993
all items were delivered as I had expected, the hitch was very easy to install. I am a 74 year old and I had no problems installing this hitch at all, heavy duty steal product. the video was extremely helpful, thank you. 641339
These people are actual human beings that can answer questions. If they aren't sure, they ask someone who is. I used to always have issues with these wiring harness converter boxes shorting out. Not any more! Pull the fuse when not in use. Good advice and thank you. 641304
I am extremely pleased with etrailer.com fast friendly Service, Parts on time. Installed Parts within minutes. 641158
the item was exactly as advertised was delivered when was told and was the right part I wanted. Was glad I found etrailer.com while looking for the part. the harness had the right plug ends and worked perfect. Had a auto shop install sorry about no pic's. 640346
Installed easily 639891
Product looked just like the picture and the you tube video that I also seen from this company is going to make it real easy to install. Thanks again 636429
This email asking how my trailer hitch is doing caught me totally off guard. That's follow up service that you don't see now a'days. Let me tell you, just order the right one and it is so easy to install. I haven't thought about it since the first couple weeks. You know, the new period. I have a trailer hitch and I think I will use my trailer for this trip to the hardware store hahaha. After that, it's become like every other tool I own. It pulled HEAVY loads PA->NC a few times during a move. Then a wild move to the west coast where I pulled trailer from NC all the way to the west coast. Unknown trips to the dump, hauling things for family (nice to have a family member with a trailer and hitch.) I also bought a shelf for putting things on the back like coolers or boxes or things you just rather not have in your car. Didn't work well for the Elantra, too low to the ground for the shelf attachment sticking off the back. Suffice to say, this is my opinion, I used my trailer above spec weight on occasion (I believe this because tires were rubbing on the fenders for a bit just before I reached my destination.) I tried to maintain tounge weight, but may have exceeded that as well ?? I could have been lucky, I could have been within tolerance but I have a history of breaking tools because I use them alot, (and sometimes you gotta improvise, anybody tells you different has not worked on anything anywhere anytime.) My hitch never budged a bit. It was so great, I believe they should be standard issue on a car. If you want a trailer hitch on your car, don't forget the light package, they had the one for my make and model. I just clipped it in, put on the hitch by myself and loved it ever since. (You may want to have assistance holding the hitch in place while putting the bolts in place. I did it myself but I have done lots of mechanical work.) Get one, stop searching, be happy. 636015
Products work great. Installed with no problem, trailer lights are nice and bright, surge brake override works as it should in reverse. The five-flat should be supplied with a cover. 633852
So easy to install and shipping was super fast! Now the LED lights on my boat trailer work great!! 633822
So Far, working fine...I replaced a similar product that I purchased from Curt. Not sure if it ever worked as I didn't need to pull a trailer until months later when I discovered it did not work... Works well in my 2010 Ford Escape. 629425
I purchase this wiring harness to be installed on my 2008 Ford Escape. The insulation straightforward, follow the instructions. After 1 year of use I can say I've had no problems. All the products can I purchased from etrailer I have been happy with the product, and the service that I have received etrailer. Great customer service. Keep up the good work guys, and gals. 627868
I rented a trailer from the hardware store that had a short in it and the harness burnt up. When it has a short it doesn't go thru the fuse 1st. 619994
The purpose of the inline fuse on the power wire feed is to protect the taillight converter from a short in the wire linking the battery and the converter, and not from a short that might occur in the trailer wiring itself. In this instance, the converter did its job as it was designed to by preventing the short from spreading to the vehicle wiring system and destroying the the ECM. This is why Ive always been super-wary of rental trailers.
-- Mike L - 04/10/2019Great! 619675
Quick delivery. Easy install. Love the install video. Would purchase again. No problems at all. 619175
Product was trailer wiring for my 2010 Mercury Mariner. Factory-fit plug-in connectors were very clean-looking and easy to install. The instructions were very clear and the video supplied by etrailer was helpful. There was more than enough wire and zip ties to make the job neat and tidy. The connectors were quality along with the capped fuse holder. Also like very much that the 4 flat connector had a cap supplied with it to prevent corrosion problems. 616690
Good product. Good instructions. Fairly simple to install. 615105
Great but I would still like an adapter from four wire to seven and a cost for low cost trailer brake controller. Love the four wire. Only and done. Thanks 614534
Just finished installation on a 2008 Ford Escape Hybrid. The product is great--with one big exception--following the installation instructions, the power wire that runs from the battery along the frame-rail to the power pack which ends up being mounted near the passenger side rear signal light is not nearly long enough. I had to scrounge around the garage to find an additional 3' of 12 gauge wire so I could reach the power pack. Other than that, it was an easy installation. 613002
Perfect fit, easy install. Take the time to read the instructions thoroughly. I got everything put together including completion of the wiring harness in about an hour. Best thing about etrailer is their customer service, top-notch! 612841
put a custom draw tite 75751 on my 2012 Escape limited with a 118551 4 pole connector. Other than not having a lift, the process was straight forward and easy to follow. Ready for the lake in 2019! 612548
Instructions were clear and everything worked great. If your headlights have N "auto" and an " on" setting you might have to put it to "on". The breaklights would not work when headlights we're set to auto for me. 610204
Looks great, I am have it installed this fri. I am sure it will work out just fine. very fast delivery. 604706
Wiring fit vehicle fine takes awhile to install. 603216
Awesome 601267
Install was very easy. It all worked great, came quick, and was just as it was described. Will use you again for sure. 598424
Christine was great and knew her products and very helpful. The order was handled very well and I received my part at a very reasonable time. My place to shop for parts to my trailer from now on. Ed 596919
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