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  1. Custom Fit Vehicle Wiring
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  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
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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 # 118344
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Our Price: $26.83
Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118344 - 4 Flat - Tekonsha
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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 - no cutting, splicing or tapping required. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118344 or order online at Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (144)
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Tekonsha Custom Fit Vehicle Wiring - 118344

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No 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.


  • 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
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage: 7.5 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 either the tail light assemblies or interior trim panels to access this harness.

T-One Connection Location Points Behind Tail Lights

Once installation is complete, the 4-way flat connector will be stowed either in the jack storage compartment of your 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.

118344 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118344 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118344

Average Customer Rating:  4.9 out of 5 stars   (144 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.

1998 Ford Van

Product arrived very quickly and was very easy to install. I was absolutely dreading wiring the trailer little on this van and this harness made the job very simple!

Been a year and the lights are still working like a charm! I highly recommend this product!
Rusty - 07/12/2022

2000 Ford Van

Very fast delivery product is good quality for the price works great plug and play no wire cutting plugs right in I love it got the job done in 5 minutes took the light out plugged it in and I was done can’t get no easier than that

2001 Ford Van

Arrived on the promised time frame. Appear to have adequate instructions.


Works fine towing a tent trailer


Looks good


I would have given it 5 stars but the connectors were not correct for my vehicle. This claims to fit a 2002 Ford Sport Trac but my plugs are slightly different. I had to modify this connector a bit which slowed what would have been a quick easy install. Ford may have used slightly different connectors on certain Sport Tracs that year but the manufacturer of this connector should be aware. Fortunately it was just ringing out one of the tabs blocking it from going together. etrailer's price was lowest and the delivery was prompt. I am a return customer.


Received my order this afternoon and have it installed already, very simple installation. Very happy with the speed of delivery and quality of the products.


Easy to Install. Works great. Just needed a tie-wrap to fasten trailer connector to truck body to keep it from hanging down. I bought one earlier and tried just wrapping the wiring around a brace, but it worked loose and tore off. No problems now.


Received very quick was easy to install and allat a fair price


Great product and soo easy to install!

2002 Ford Explorer Sport Trac

Connectors had to be modified to fit my 2002 Explorer Sport Trac.


I had put off wiring my van for a harness to go with my trailer because just the idea of running wires and tapping in to the right places, testing it all and sealing it back up was full of concern if I would get it right, how much time it would take, ... I was thinking just how frustrated I might become and so I put it off over and over again.

Then I found your site and your information. I looked up my vehicle and the part I needed. I called your number and spoke with a very helpful customer service representative. She looked up the instructions and even read part of it to me. She said the harness has two leads that just go between your tail lights and the wiring from your vehicle. They just plug right in.

I ordered the part with 2 day shipping and it came right on time. Installation was a snap. I was probably done in 15 to 20 minutes in all and the trailer lights work perfectly. The job I needed to do the next day was a breeze because I now had access to the trailer with confidence.

I even went to the store I bought my trailer from and told them about you all so they could tell other people.

Thanks for being so helpful and providing such a great product!


2001 Ford Edge

Hooked it up at the taillight areas and works great on the 2001 ford ranger - edge thank you all for your help when i called!

2001 Ford Van

Product arrived a day earlier than expected. Installation was a breeze, less than 1/2 an hour. Only wished I knew earlier such a perfectly simple fix to my trailer lighting problem was available

2002 Ford Ranger

I love it. Went all over town looking for help with the trailer light hook-up truck side for a 2002 Ford Ranger. I was told that the truck was factory pre-wired and there was nothing that could be done but follow the wires to find the problem and then fix the problem. Cost about $75.00. Called etrailer and they told me how to do the repair without the hassle. Ordered the part, fixed it in about an hour. Thanks etrailer. You saved me about $50.00. The harness was easy to use, just open up the lights and snap in the plugs.

2000 Ford Van

Just as advertised….


First off with all the information available to you on the etrailer website it would be hard to buy the wrong parts. With that information I already knew what needed to be done before my wiring adapter came. The instructions were also easy to understand when i looked at them. The adapter easily plugged into the back of the tail lights just as described and my trailer lights worked perfectly. From order, to emails about my order to a quick delivery this could not have been any easier. This is my third time ordering from etrailer and I always look at there website when I need to set up for towing. Sorry no pics job was to easy.

1997 Ford Van

I've bought a tow hitch and parts for a boat trailer I was building. These guys have the best service, the cheapest price, and the highest quality parts. I would rather wait the couple days it takes to get my order and have it right than to have to scurry from store to store dealing with some sales person that has a whole 8 hours training (maybe) trying to find what you need. Anyway, etrailer solves that problem. Thanks

1997 Ford F-150 and F-250 Light Duty

The running lights on my trailer would not work because of a short in the wiring harness on my truck. I purchased this harness from etrailer which took about 20 minutes to install. Now all the lights are working on my trailer. I would definitely recommend this product.

2000 Ford Ranger

The harness is easy to install on my 2000 Ranger. I have a set of magnetic trailer lights that I used to test it and everything worked right (left, right, brake, backup). This is my second purchase of this harness. The first one I pushed the loose wiring up into my spare tire with the intention of fastening it with tie-wraps later. When I saw the torn wiring hanging loose later, I realized what I forgot to do. On this one I fastened it as part of the installation (words to the wise).

2000 Ford Ranger

Product, item 118344, fit as instructed on my 2000 Ford Ranger XLT. Easy to do, only taking about 30 minutes to install within the factory harness/connectors. Instructions seemed a little vague to begin with but after looking at product and reading directions again all made sense. The T-One wiring harness works great and the harness wiring length was more than enough to make fitting and routing easy underneath my truck. Thanks to your Expert for all his assistance and if needed, will do business with you again. I have, and will continue, to recommend your business. Howard

2002 Ford Ranger

Bought bumper hitch and it was recommended to also purchase a wiring harness designed for my type of vehicle. These guys know their what makes it easy to install their products


Fit exactly the way it is supposed to.would recommend to anyone. Thanks

2001 Ford Explorer

this kit came extremely fast. I ordered on the weekend and had it in my hand by mid-week. although my vehicle was not named in the instructions specifically, it was still not hard to install. It took longer to route the wires under the plastic trim than anything else. My Ford is 10 years old so sometimes things don't always go right. but this kit worked perfectly. Took about 20 minutes. I highly recommend Etrailer.


Used this to tap into my turn signals for my snow plow. The wire loom was very short next to my turn signals and this allowed me to tap into the tight bend with plugs instead of splices. These will keep the connectors from corroding. I am glad I found these for my Excursion, it saved a lot of frustration of trying to splice in tight areas. I highly recommend these for any project. Well worth the money.

Show More Reviews

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

  • Trailer Wiring Harness for 2001 Ford Expedition with Square Connector
    The Tekonsha trailer wiring harness part # 118344 is the correct trailer wiring harness that fits your 2001 Ford Expedition and matches your picture.
    view full answer...
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  • Where Does the Tekonsha Wiring Harness 118344 Install on a 95 Ford E-150 Econoline?
    To get the Tekonsha # 118344 installed on your 1995 Ford E-150, you will need to disconnect the center black wiring harness connector from the tail light assembly, being careful not to damage the locking tabs. Plug the T-Connector between these separated halves and you will be good to go. I know this sounds like one is being left out, but it will get your lights working properly on your trailer.
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  • Troubleshooting Wiring Connections Based on Color Code for 2003 Ford Explorer Sport Trac XLT
    For a standard trailer wiring like the custom T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118344 for your 2003 Ford Explorer Sport Trac, the wiring colors will be consistent with most trailers. The 4-way flat connector will have 4 colored wires: white-ground green-right turn/stop yellow-left turn/stop brown-running lights Your horse trailer should have the same functions in the matching locations even if the colors are not a match. I've attached a wiring article...
    view full answer...
  • Replacement 7-Way and 4-Way Recommendation for 2004 Ford F-150
    For a replacement 7-way and 4-way for your 2004 Ford F-150 you would want the part # HM40975. This has been confirmed as a fit for your vehicle and has both connectors that you need.
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  • Trailer Wiring Harness Recommendation for a 2000 Ford Ranger
    The trailer wiring harness part # 118344 that you referenced has been confirmed as a fit for your 2000 Ford Ranger. It installs by plugging in line with the taillight harnesses of the truck. Basically you will unplug the taillights and plug this harness in between the two connectors.
    view full answer...
  • Why Would Trailer Wiring Not Work When Vehicle Headlights are On
    This sounds like a classic ground problem. A bad or weak ground will show up when there is more load on the system. That is why when you turn the vehicle lights on, the constant draw of the trailer running lights creates more of a load and the bad ground shows up. There are some common places to check for a bad ground. First make sure all of the trailer lights and the main trailer connector are attached to clean and corrosion free bare metal surfaces.
    view full answer...
  • Installation of T-1 Vehicle Wiring Harness on 2002 Ford Explorer Sport Trac
    The T-1 Vehicle Wiring Harness you referenced, part # 118344 would plug inline into the existing wiring harness behind each of the tail light assemblies on your 2002 Explorer Sport Trac. The lead with the yellow wire is for the drivers side, and the lead with the green wire is for the passenger side. Access the rear of the tail light assembly by removing it from the vehicle. The factory wiring harness plugs into the rear of the assembly. Unplug the harness by depressing the locking tabs...
    view full answer...
  • Will Tow Ready T-One Trailer Wiring Harness # 118344 Fit a 2003 Ford Ranger
    Yes, trailer wiring harness # 118344 is listed as a fit for the 2003 Ford Ranger. I have included a link to the installation instructions for you to view. Installation is fairly straight forward. The connectors on the harness plug in line with the tail light wiring behind each of the tail lights.
    view full answer...
  • Troubleshooting Trailer Running Lights Not Working on a 2004 Lincoln Aviator 4-Way
    The first thing to do would be to use a circuit tester like our part # 3808 and test the running light function on your vehicle to determine if the problem is on your vehicle or if its on your trailer. Check out the video I attached on how this is done. If voltage is there then you know the problem is on your trailer. The first place to check there would be the trailer connector. If there is corrosion or cut or exposed wire you will need to fix as necessary. From there trace the running...
    view full answer...
  • Solution for Bypassing a Factory Trailer Wiring Harness on a 1997 Ford F-150
    If all you need is a 4-way and are tired of messing with the headache of tracking down wiring problems a simple solution would be to install the part # 118344 on your 1997 Ford F-150. This will simply install in-line with your truck's taillights and will provide you with a 4-way. I also attached an FAQ article on troubleshooting 4-way installs for you to check out.
    view full answer...
  • Is a Converter or Modulite Present in the Trailer Wiring for a 1998 Ford Expedition
    A converter or modulite box should not be present on your 1998 Ford Expedition. Converters are required for vehicles with separate turn and tail lights, and modulite wiring is required for vehicles that cannot power a trailer directly from their tail light circuits. Neither would apply to your Expedition. To wire your vehicle for towing, you would be able to use a simple plug in T-connector style wiring harness. We offer T-connector # 118344 for the 1998 Expedition models. The # 118344...
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  • Trailer Wiring for 1997 Ford E-350 For When Its Flat Towed
    In our fitguide the 1997 Ford E-350 is listed as a 1997 Ford Van we I apologize for the confusion. What you'd need is the 4-way kit part # 118344 which would cover the lighting functions of a vehicle that is being flat towed and if needed you might need to convert that to a 7-way with the part # 37185.
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  • Trailer Hitch Fit for 1998 Ford E-350 Van
    We do have a trailer hitch for you, though the Ford E-350 didn't have a Super Duty version available until 1999, so what you have is an Econoline model (and just as a note, we don't have a way of searching anything by VIN so this was based on research; you may want to call that VIN into a local Ford dealer). Having said that, the correct trailer hitch receiver for a 1998 Ford E-350 Econoline is the Curt Trailer Hitch Receiver # 14053. Additionally, if you plan on towing and need a trailer...
    view full answer...
  • Wiring Harness That Will Fit 1998 Ford E-350 Econoline Without Factory Connector
    To add a 4-way to your 1998 Ford E-350 Econoline that does not have the factory tow package, all you need to do is add the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118344, which uses plug-in connectors that you will install behind the van's taillights. I'm not quite sure what you are referring to in regards to a round trailer plug, as that would only be needed if you were using trailer brakes. Without brakes you will only need the lighting functions of the 4-way,...
    view full answer...
  • Capacity of Curt Trailer Hitch Receiver for 2002 Ford Ranger
    The Curt Trailer Hitch Receiver # 13138 that fits your 2002 Ford Ranger has a 4,000 lb towing and 400 lb tongue weight capacity. So as long as you are beneath those figures, such as with a 3,900 lb trailer, you can tow with it safely. I have added a link to a video review and the installation instructions for you to check out as well of the Curt Trailer Hitch Receiver # 13138. To complete your towing set up, if you do not have a 4-flat wiring harness, the correct fit for your 2002 Ranger...
    view full answer...
  • Adding New 7-Way Harness to 2000 Ford Excursion with Square Connector
    All of the custom wiring harnesses we have available that are designed to tap into the factory tow package of your Ford Excursion utilize the circular US Car Connector type connector. It's possible that you've simply located a different plug behind the bumper that has a different purpose (we've seen this from time to time) but if you're sure you've found the correct connector for installing a new wiring harness, the only solution we have would be a T-Connector Harness like the Tekonsha...
    view full answer...
  • Trailer Hitch and Wiring for 2000 Ford Ranger with Step Side Bed
    Draw-Tite hitch # 75082 will fit your 2000 Ford Ranger with step side bed so long as it has the factory-installed step bumper. This hitch requires some drilling for installation and a full-size spare tire may no longer fit under the vehicle with the hitch installed. An install video is linked for you. If you also need a 4-pole wiring harness you can use part # 118344 which offers simply plug-in installation.
    view full answer...
  • Recommended Trailer Hitch for 2002 Ford Ranger with Flareside or Stepside Bed
    For your 2002 Ford Ranger with the Flareside or Stepside bed, I recommend the Draw-Tite Class III Max Frame Receiver Hitch # 75082. This Class III hitch is confirmed to fit your truck and will use existing holes in the vehicle frame to ease the installation process. Just note that the full size spare tire may not be able to be stored underneath the truck after the hitch is installed. I have attached the complete installation instructions that you can use for reference. If you plan on...
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  • Troubleshooting Trailer Connector on 1998 Ford F150 With No Output on Running Light Circuit
    According to the owner's manual I found online, there are two fuse locations you can check, assuming that the 4 pole trailer connector you're speaking of is factory installed. In the passenger compartment fuse box located under the dash to the left of the brake pedal, check the fuse in location # 18 and replace if necessary. In the power distribution box under the hood, the fuse in the # 1 position controls the trailer running light circuits, check and replace if needed. If you find a...
    view full answer...
  • Compatibility of 4-Pole and 7-Way Trailer Connectors on 2003 Ford F-150
    If your existing 4-pole harness is a factory part that plugs in to an OEM connector like those on Tow Ready harness kit # 118242, you can have both harnesses active at the same time by daisy-chaining then together. If you have an aftermarket 4-pole harness that connects to the truck's taillight wiring then again both will still remain active since they connect to the truck independently of one another.
    view full answer...
  • Recommended Replacement Trailer Connector for 2002 Ford Van
    T-One 4-pole harness # 118344 is a correct fit for your 2002 Ford Van and installs at the taillight assemblies using custom-fit connectors that match those on your van. If the harness does not function you can examine the metal contacts within each of the harness and vehicle connectors for any signs of damaged or bent contacts or foreign material that would interfere with signal transmission. A circuit tester like # 40376 will make it easy to test the van's connectors for the correct signals....
    view full answer...
    Image 1 for
  • How to Find the Reverse Light Circuit on a 1997 Ford Van
    The easiest way for you to find the reverse wire in your tail light harness would be to use a Circuit Tester Kit # 40376 to test the wires in your tail light harness for voltage when the reverse lights are on. I attached a review video for you to check out about testing wires for voltage using this product. And then for a ground you could just attach the wire to a clean metal portion of your 1997 Ford Van body or frame. I searched around on the internet and could not find any wiring diagrams...
    view full answer...
  • Running Lights on 2 Trailers Not Working Towed By a 2003 Ford Ranger
    Since the issue is happening on both trailers, it seems unlikely that the trailers are the problem. So the first step is to isolate the problem by testing the truck side trailer connector with no trailer connected. You will need a circuit tester, # 40376 if you do not have one, to test the wiring. Have someone sit in the truck and go through the lighting functions while you test the connector with the circuit tester. If the running light circuit (located next to the ground pin) is not...
    view full answer...
  • Recommended 4-Way Wiring Harness for 2000 Ford Ranger STX
    The Hopkins 40215 kit is designed to be a fit for a 2000 Ford Ranger STX model. After talking with one of my contacts at a supplier, they told me that there were different connectors installed in Rangers for a brief period of time. That may be why the mismatch in the connectors as you spoke of. I am attaching a photo of the # 40215 connector we have. We pulled one from the warehouse to see how the pins were located. It sure appears that the connector would not match the OEM harness you...
    view full answer...
    Image 1 for

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