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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118381
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Our Price: $29.61
Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118381 - 4 Flat - Tekonsha
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Quickly and easily install a 4-way trailer connector on your vehicle using this custom wiring harness. T-One connector plugs directly into existing factory 7-way - no cutting, splicing or tapping required. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118381 or order online at etrailer.com. 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 (142)
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Tekonsha Custom Fit Vehicle Wiring - 118381

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your vehicle using this custom wiring harness. T-One connector plugs directly into existing factory 7-way - no cutting, splicing or tapping required.


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 to your existing 7-way - no cutting or splicing of wires
    • Locate connection points behind rear bumper
    • Plug in T-connector
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage: 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 rear bumper, on the driver's side.


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.



118381 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118381 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 - 118381

Average Customer Rating:  4.6 out of 5 stars   (142 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle using this custom wiring harness. T-One connector plugs directly into existing factory 7-way - no cutting, splicing or tapping required.

by:

did not fit I had to splice in 14" of wire so it could reach the two tail lights
and this was the second one I purchased the first one did not have the correct connectors


Comments
This part is meant for Jeeps that have the factory tow package. I am wondering if that is the issue here. If your jeep doesnt have that then you would need part # 118425
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
$35.81
.
-- Etrailer Expert Brooke M - 08/09/2022


by:

I've had this on my truck for a year to pull my little 5x8 utility trailer for work. It's worked every time so far and haven't had any issues with it. So far so good. Oh, and it only took about 20 minutes to install of you're into that kind of thing.




by:
Jeep

I’ve had this over a year now and it has held up to so relatively extreme overland camping trips in that time. I would purchase another if I ever had to, but with the quality provided… I probably won’t ever have to replace it. It may be hard to install on some vehicles, it was hard in mine, but very worth it and to no fault of the product, just the design on my Jeep.




by:

Right part, easy to install, straight forward harness.




by:

Super easy to install and worked right away, no additional fuses or lights necessary. Videos were easy to find on [online] and very easy to follow. Would recommend this to anybody. Mine did not come with the double sided tape, but I had some lying around so no worries.




by:

It would have been very easy to install but my truck did not have the quick disconnect behind the bumper.


Comments
You mentioned that you were not able to find the connector and I wanted to ask if you were adding on the 4 flat or replacing it.
-- Etrailer Expert Jenny N - 04/14/2022


by:

Wrong product .. reordered correct one .. said this was 4 pin connection, but requires vehicle to be equipped with 7 pin connection from factory. Guess you have to read the fine print


Comments
For a 2004 Dodge Dakota with a factory seven way this harness adds a 4 flat. For a 2004 Dodge Dakota that did not come with a factory harness part # 118323
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
$33.34
would be a fit.
-- Etrailer Expert Jenny N - 01/24/2022


by:
2005 Jeep Grand Cherokee

curt hitch i pefer to use because never have any problems always easy to install and get help when i need it however i ordered the wrong trailer harness for the jeep 2005 grand cherokee it does not have factory installed tow package can i exchange it please let me know what i have to do thank you henry m


Comments
Henry, you can simply call us at 1-800-298-8924. We would love to help. For an explanation of our return policy, please see this helpful link:
-- Etrailer Expert Laura E - 08/19/2017


by:

Bought and installed over a year ago. Easy install. Works great. Would buy again.


Comments
Its been used and stored outside, uncovered for over a year now and the wiring harness still works great!
Christine G - 05/12/2022


by:

etrailer received, filled, packaged and shipped my small order (wiring harness) within an hour, then turned it over to the US Post Office.... Within 2 days, it crossed the state line from Missouri into Illinois. A few days later, it was received in Chicago and should have arrived in Canada in short order.... Instead, tracking my order a week later revealed that it was resting comfortably in Miami Florida. A call to etrailer and Carol soon straightened things out. It eventually found its way to me and I am quite pleased with the service from etrailer. The Post Office? Well, you know..... Bobber.




by:

This product was what was recommended by your site as the proper wiring harness and it IS NOT compatible with my vehicle. Our family’s vacation has already been pushed back by 2 days dealing with this situation and we are still working on finding a local solution!


Comments
This wiring harness is only compatible if your Freightliner Sprinter has the factory equipped 7-way trailer connector, as we state in our product fit guide. If your Sprinter does NOT have the factory 7-way, youd need part # 118650
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
$72.22
instead.
-- Etrailer Expert Mike L - 05/29/2019


by:

I ordered two items, one was wrong and it was on me. Becky replied quickly and was very courteous. She in every way. Thanks Becky and thanks etrailer.




by:

Super easy installation, 30 mins (including tool take out and put away). Exact fit, with ALL necessary parts. etrailer has exceptional customer service and offers exact fit parts at great prices!




by:

Plug and play baby that simple to install, plenty of wire for the hook-up worked first time and has never failed.




by:
2006 Jeep Grand Cherokee

Was able to install it under 5 minutes.




by:

Website is easy to navigate and delivery was earlier than expected. Great price and quality.




by:

Easy to install




by:

Product was as described. Had some difficulty getting it to me and original shipment never arrived.. customer service was great. Had another one shipped out. Unfortunately, it still arrived 3 days after when I was hoping it would be, but oh well. Friendly and helpful staff nonetheless.




by:

Everything is great. Thank y’all for the excellent service




by:

Installs easy, fits correctly, well made harness. this is the third harness i've purchased (for three different vehicles) and i wouldn't go anywhere else.




by:
2005 Dodge Dakota

super easy to put on. It took less than thirty minutes to install. looks great




by:

The wiring harness arrived promptly, was good quality, installed easily and works good. I am satisfied with this product.




by:

Works as advertised.




by:
2000 Dodge Dakota

I recently recieved my tow hitch for a 2000 Dodge Dakota. The part arrived promptly and in excelent condition. I was very pleased with the quality of this hitch by Curt. It was very stout and had great welds. I haven't had a chance to mount the unit yet but the measurements look to be right on. etrailer.com has a new customer.








Comments
Everything worked out great. Thanks for the check in. Have a great summer. Regards, Gary H.
Gary H - 06/27/2014


by:
2007 Dodge Dakota

didn't even install it .... my Dakota had no hook up ... had to hardwire a connector .... waste of $15 , not even worth my time returning it .... I did buy a hitch that I am using though ... should have bought a chevy



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Show More Reviews

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



  • 4-Way Trailer Wiring Harness Recommendation for a 2007 Dodge Dakota
    You will only need to order a quantity of 1 of the T-One Vehicle Wiring Harness # 118381 to install a 4-way on your 2007 Dodge Dakota. Check out the install video I attached to see how it installs.
    view full answer...
  • Will a 2007 Dodge Ram and 2005 Ford Trailer Connectors Match to Tow the Same Trailer
    Wiring the trailer to match the pin out on the 2007 Dodge Ram should allow it to work with the 2005 Ford as well. The reason is that vehicles generally have the same pin out on the trailer connector, the two most common being a 4-Way flat and 7-Way blade style. To make sure everything matches up and just to be on the safe side you can use a circuit tester like # 3808 to test the functions on the vehicle side connectors. On the trailer side you can either trace each wire back to determine...
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  • Wiring 2007 Dodge Ram 3500 For Installation of Flat Bed
    We don't offer a direct part, but I know how you could fabricate a pigtail. You'd need part # 118381 that would plug inline with the harness that plugs into the rear of the 7-way. You could simply cut the 4-pole off and wire the yellow wire to the left turn, the green wire to the right turn, ground the white wire and run the brown wire to the running light and jumper it over to the running light on the other side. This set up would provide you with a quick disconnect. You'd need to wire...
    view full answer...
  • Will a T-One Vehicle Wiring Harness fit Into a 2005 Jeep Grand Cherokee?
    The T-One Vehicle Wiring Harness, # 118394, will fit a 2005 Jeep Grand Cherokee if it does not have the factory tow package, and because your hitch is not factory, is is likely you do not have that package. If it turns out you do have the factory tow package, you would need the Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118381 I have added links to video reviews and an install video for you to take a look at.
    view full answer...
  • How to Wire a Itasca Navicon Motorhome with Valley 7-Way Wiring for Flat Towing a Jeep
    Part # 118381 does not have a converter built in. Parts are tricky to select when dealing with motorhomes built off of production chassis. Itasca may have had a certain number of chassis built by Dodge with different wiring for their purposes. The parts we carry like 118381 are designed to be used with the production models sold at dealerships. Fotrunately for you, Itasca teamed up with Valley and have provided you with a 7-Way connector and what ever converting needed to be done has already...
    view full answer...
  • Which Trailer Wiring Harness Fits a 2004 Jeep Grand Cherokee Laredo with Factory Tow Package
    In 2004, the Jeep Grand Cherokee either came with a factory installed 7-Way harness at the rear of the vehicle or no trailer connector. The towing prep package may not necessarily include the 7-Way but it could still have the tow package. This sounds like the case for your vehicle. Since it states that it has the towing package, then you will need Tow Ready Custom Fit Vehicle Wiring, # 118381, that you have referenced. You will need to locate the factory wiring harness behind the bumper...
    view full answer...
  • Correct Tow Wiring Harness for 2008 Jeep Liberty
    If your Liberty was equipped with the tow package, it will have the 7-way trailer connector on the rear of the vehicle. Part # 118381 would plug inline with the wiring harness leading to the 7-way. Since you do not have the factory hitch, you probably do not have the tow package and would want to use part # 118554. Installation is pretty simple. Access the rear of the tail light assemblies, plug the connectors inline with the existing connections behind the tail lights, and run the power...
    view full answer...
  • How Do I Install a 5-way Flat Connector at the Back of my 2006 Jeep Commander to Tow my Boat
    In order to have a 5 pin flat trailer connection you will first need to install the Tow Ready Custom Fit Vehicle Wiring, part # 118381, that you referenced. I attached installation instructions and a link to an installation video for this product below for you to check out also. The next thing you will need is an Adapter 4 Pole to 5 Pole Trailer Wiring Adapter, part # 20036. This adapter will plug into the 4-way that you just installed with the # 118381, and then you can run the blue wire...
    view full answer...
  • Troubleshooting Trailer Lights Not Working with Wiring Harness # 118381 on a 2002 Dodge Durango
    First, in order to use Trailer Wiring Harness, # 118381, your 2002 Dodge Durango will need to be equipped with a factory tow package. If it does have a factory tow package, check the owners manual to find the fuses and/or relays related to the tow package to determine if anything is missing or needs to be replaced. If the Durango does not have a tow package, you will need to use a different wiring harness, # 118334. This harness plugs in line with the vehicle tail light wiring. I have...
    view full answer...
  • 4-Way Trailer Wiring Recommendation for a 2001 Dodge Dakota
    If you have a round 7-way at the rear of your 2001 Dodge Dakota you would want the part # 118381 for trailer wiring. If you do not have any trailer wiring present at the rear of your vehicle you would want the part # 118329. I attached install videos for both products.
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2004 Jeep Grand Cherokee without Tow Package
    Since you do not have the tow package I am assuming you do not have a factory trailer connector. In that case I would recommend you get a Tow Ready Custom Fit Vehicle Wiring # 118369. This is the recommended wiring harness for the 1999-2004 Jeep Grand Cherokees, I attached an install video and installation instructions for this product for you to check out also.
    view full answer...
  • Trailer Wiring Harness for a 2005 Dodge Durango
    If your 2005 Dodge Durango came with the factory installed 7-Way and for whatever reason it is no longer there then yes, using # 118381 will provide the lighting functions for the trailer: running lights, brake lights, and turn signals. If the vehicle did not come with a factory trailer connector then you would use harness # 118390 which plugs in line with the vehicle tail light wiring and requires a direct connection to the vehicle battery. I have linked some videos and instructions for you.
    view full answer...
  • Which T-One Trailer Wiring Harness Fits a 2004 Toyota Sienna Van?
    The T-One is a custom fit wiring harness, but part number 118381 will not fit your 2004 Sienna Van. This harness is custom fit for a full-sized Dodge van. We do offer a custom harness for the Toyota Sienna Van, the T-One wiring harness you need is part number 118304. For your convenience, I will attach links to the referenced products, a helpful FAQ wiring page and an installation video for the 2004 Sienna.
    view full answer...
  • Do I Need a Powered Modulite for a 2007 Jeep Liberty and What Part Would I Use
    For your 2007 Jeep Liberty, there are a couple of trailer wiring options. If the Liberty did not come with a tow package, you will need T-One Connector w/Upgraded Circuit Protected ModuLite, # 118524. A powered converter is required to protect the vehicle sensitive electronics on models not equipped with a tow package. If your Liberty did come with a factory tow package, you would need Tow Ready Custom Fit Vehicle Wiring, # 118381. A Liberty with a tow package has a wiring harness made...
    view full answer...
  • How to Pick Out Trailer Wiring for 2001 Jeep Grand Cherokee
    Sounds like you are trying to determine if your 2001 Jeep Grand Cherokee has the factory tow package so you can pick out the correct trailer wiring harness. Easiest way to tell would be to check to see if the vehicle has a factory trailer hitch and wiring installed on it currently. If so, then you'd have the tow package and the kit you'd want is the # 118381 which would plug inline with the 7-way you have to give you a 4-way. If instead you do not have either a hitch or wiring you'd need...
    view full answer...
  • How to Determine with 2006 Dodge Durango has Factory Tow Package
    If you already have a 7-Way connector at the rear of your 2006 Dodge Durango then the T-One # 118381 is the correct part. If you don't have a 7-Way then you would need the T-One # 118390 which is for an '06 Durango that doesn't have the tow package. This kit tees in right behind your tail light housing and pulls power directly from your battery to help protect the OEM wiring on your Durango. An installation video and the written instructions for both kits have been linked for you to...
    view full answer...
  • How To Choose the Correct Trailer Wiring Harness for a 2002 Dodge Durango
    There are two different trailer wiring harnesses for a 2002 Dodge Durango which will be dependent on whether or not you have the tow package. If you do have the factory tow package then you can use the T-One Vehicle Wiring Harness part # 118381 which only uses one plug but if you don't have the factory tow package then you will need to use the T-One Vehicle Wiring Harness part # 118334 which uses two plugs. It doesn't sound like you have the factory tow package therefore will need the...
    view full answer...
  • Trailer Wiring Recommendation for 2007 Mercedes Sprinter RV Chassis
    For your 2007 Dodge Sprinter RV chassis the brake and turn signals are sent along separate wires. A converter is required unless the vehicle is equipped with a tow package plug. The tow package plug has already been converted. If you need a 4-way and you HAVE the tow package you only need the part # 118381, if you do not then you'd need the part # 118650 which does use a converter box.
    view full answer...
  • Adding a 4-Way Connector on 2000 Jeep Grand Cherokee
    You will need wiring on your 2000 Jeep Grand Cherokee to power the lights on the U-Haul, though I'm not certain from your question if you were saying you had the tow package or not. If you do have the tow package that means you have a 7-way connector on your Jeep; if the U-Haul had a 4-way connector you could add a 4-way to your Jeep with the T-One Wiring Harness # 118381 which simply connects to your Jeep's existing 7-way by plugging in. If you did not have any wiring on your Jeep you...
    view full answer...
  • Trailer Wiring Harness for a 2007 Chrysler Pacifica without Factory Tow Package
    Trailer wiring harness # 118381 does fit the 2007 Chrysler Pacifica but only models that came with a factory 7-Way connector. It would allow you to add a 4-Way in addition to the factory 7-Way. For Pacfica models that did not come with a factory 7-Way connector you will instead need to use wiring harness # 118303. I have linked a video showing an example installation for you.
    view full answer...
  • How To Choose the Correct T-One Vehicle Wiring Harness for a 2007 Chrysler Pacifica
    In regards to a 2007 Chrysler Pacifica, the T-One Vehicle Wiring Harness part # 118381 is a fit for models with the factory tow package and the T-One Vehicle Wiring Harness part # 118303 for models without the factory tow package. If you had the factory tow package then you would have a 7-way trailer connector clearly installed on the exterior of the vehicle. I would be willing to bet you do not have the factory tow package so the T-One Vehicle Wiring Harness part # 118303 is likely what...
    view full answer...
  • 7-Way/4-Way Integrated Trailer Connector Plus Additional 4-Way Recommendation for 2008 Dodge Ram
    If all you are looking for is a 7-way and a 4-way that are integrated together and would install on your 2008 Dodge Ram by simply replacing your current factory 7-way all you would need is the part # 42145. This would allow your travel trailer to plug into the 7-way when needed and then your light bar to plug into the 4-way. This installs with 4 screws around the perimeter of the housing like you said you were interested in. Now if you are trying to leave the 4-way free so that you can...
    view full answer...
  • Installation of Trailer Wiring Harness and Other Parts for Towing with a 2005 Jeep Grand Cherokee
    The wiring harness # 118381 plugs into a connector that is behind the rear bumper. However, it is not confirmed to fit your Jeep since you don't have the factory tow package. On your 2005 Jeep Grand Cherokee you need # 118394 which plugs in on both sides behind each tail light. I've linked an installation video for you to take a look at. Also, if you don't already have a trailer hitch receiver I recommend the Draw-Tite # 75338. It installs using 4 bolts. I've also linked this installation...
    view full answer...
  • Troubleshooting A Faulty Left Turn Signal On A 2005 Jeep Grand Cherokee
    There are a few things you will want to check before you resort to replacing the system. First you will want to check for loose wires on the rear of the vehicle's trailer connector in addition to corrosion in the vehicle's trailer connector itself. After this is done you will then want to test the yellow wire at the back of the vehicle's trailer connector to ensure power is passing to the connector. If there is voltage present the problem is in the trailer connector and you will need...
    view full answer...


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