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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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. Call 800-298-8924 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 (89)
  • Q & A (114)
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Tekonsha Custom Fit Vehicle Wiring - 118381

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

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   (89 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.

- 118381
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 358321



- 118381
by:
2005 Jeep Liberty

The product was everything that was advertised it arrived in perfect condition I guess I just misunderstood what I needed and inevitably ordered the wrong part my 05 Jeep Liberty did not come with a 7-way so I need a different harness to be able to hook up my trailer should have called customer service first 566851


Comments
If your Liberty didnt have the factory 7-way, I would recommend the # 118524
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
$61.07
Tekonsha powered taillight converter.
-- Mike L - 09/20/2018

43811

- 118381
by:

great service! 882892



- 118381
by:

Perfect fit! Just plugged it in with a little dielectric grease in the connector and it has performed flawlessly. 863439



- 118381
by:

One year through Ohio weather hanging off the back of the truck and still works great! e-trailer is great-excellent products, prices, and customer service! 809850



- 118381
by:
2007 Jeep Grand Cherokee

When I ordered, I didn't realise there were two different harnesses for my vehicle, based on the options it came with. Luckily I ordered the correct one. But, I probably would have sent it back, thinking it was wrong if I hadn't watched the videos etrailer included with the shipping email. Was super easy to install with their instructions. 787374



- 118381
by:
2006 Jeep Liberty

Part was exactly as described, packaging was intact, and the price for the quality was spot on. 786958



- 118381
by:
Dodge Durango

Thanks to etrailer's excellent customer service, I was FINALLY able to order the correct wiring harness for my '01 Dodge Durango. There are many variables due to several Durango models, and this was the correct one. Has worked flawlessly since installation. 756648



- 118381
by:
2001 Dodge Van

Perfect fit, excellent quality wiring. The service from etrailer is spot on. Thank you. 746094



- 118381
by:

Harness still working great! 726942



- 118381
by:

Not a do-it-yourself for an arm chair mechanic. Easily installed by my local mechanic. Works great! 725825



- 118381
by:

Easy to install, hidden when not in use, doesn't reduce ground clearance and trouble free. Local hitch installer quoted me $350 and said it would take 3" off my clearance. I saved over $200 and got a better setup. 711725



- 118381
by:

Works great. Fit good and easy to insta ll. 705622



- 118381
by:
2003 Jeep Grand Cherokee

Very happy with my order. The hitch went on with no issues, and is in use. I can't believe how quickly it got here! 694299



- 118381
by:

i am extreemly pleaseed with the service ordered sunday afternoon and received order on tuesday great thank you not installed yet 662840



- 118381
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! 647448


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
$54.32
instead.
-- Mike L - 05/29/2019

55831

- 118381
by:
2002 Jeep Grand Cherokee

Fit just like advertised. They have excellent customer service. Videos and pictures were a great help. 643956



- 118381
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! 633723



- 118381
by:

fits great 629757



- 118381
by:

This product made it so simple!! Worth every dollar!!! 623234



- 118381
by:

Plu-N-Play Easy-Peasy That's all I can say, It's that easy. Works perfect 616605



- 118381
by:

Wrong wiring packet. Probably my fault. Other than that it was excellent 604355



- 118381
by:
2004 Dodge Dakota

Was shipped same day, will save me time wiring for trailer pigtail just plut it into truck wiring. 596309



- 118381
by:
2008 Jeep Liberty

Product dose not fit 2008 jeep liberty like website states. 579651


Comments
This wiring harness will only work on vehicles that are equipped with the factory 7-way. If your Liberty does not have the factory 7-way, use part # 118554
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
$89.48
.
-- Mike L - 11/05/2018

45415

- 118381
by:
2006 Jeep Grand Cherokee

I ordered the wrong harness so I have no review to offer as to performance or install. But it looks well made and connectors appear quality. 577704


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • 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...
    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...
  • 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...
  • 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...
  • Which Trailer Wiring Harness Should I Get for my 2008 Jeep Liberty, # 118554 or # 118381
    Both the Tow Ready Custom Fit Vehicle Wiring for the 2008 Liberty by Jeep, part # 118381, and the Draw-Tite Custom Fit Vehicle Wiring for the 2008 Liberty by Jeep, part # 118554, will work on a 2008 Jeep Liberty. The difference is that the #118554 is used on vehicles that do not have a tow package, and the #118381 is for Libertys that have a factory 7 way and want a way to have a 4 way connector as well. If your Jeep Liberty does not have a tow package you will want to use the # 118554...
    view full answer...
  • 4-Way Trailer Wiring Recommendation for 2008 2500 Dodge Sprinter
    If you had a 7-way connector at the rear of your vehicle you would probably know it. It would be a black connector plastic connector like the picture I attached. If you have one then the # 118381 would work for you. If not, you would instead want the Curt Wiring Kit part # C59496.
    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...
  • Adding a 4- and 7-Way Trailer Connector to a 2000 Dodge Ram with Factory Wiring Harness
    We have 4-Ways that Tee into that square factory connector, such as # 118381 which also fits some full size vans. We also have a 7-Way # HM42190 but it doesn't have a 4-Way built in. But we also have # 20135 which is both a 4- and 7-Way and has that squarish connector. If you are not the original owner of the truck then it is possible that it came with a 4-Way flat (or someone added one) and then used a 4- to 7-Way adapter such as # 37185.
    view full answer...
  • How to Determine if a 2007 Jeep Grand Cherokee has a Factory Tow Package
    The most definite way to determine if you have a tow package or not is to contact a Jeep dealership and give them your VIN number. They will be able to tell by looking at your VIN number whether or not you have the tow package. If you have a factory installed trailer hitch with either a 4-way trailer connector or a 7-way connector then you have the towing package also. The connector should be under the rear bumper on the driver side. If you find that you do not have the towing package...
    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...
  • 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...
  • What is the Correct Trailer Wiring Harness with 4-Pole Trailer Connector for 2001 Dodge Durango
    For your 2001 Dodge Durango we offer a custom-fit wiring harness from Curt, part # C55334. Unlike universal-fit wiring kits that require cutting and splicing of wires, this plug-and-play harness from Curt simply plugs into the taillight wiring behind the two light assemblies on your Durango. I have included a link to the installation instructions for this harness. This harness uses a converter to match the wiring of your Durango and trailer that employs surface mount technology (SMT)...
    view full answer...
  • 2007 Jeep Grand Cherokee T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Recommend
    Are you sure you have found the correct harness to use to install the part # 118381 which has been confirmed as a fit for your 2007 Jeep Grand Cherokee with the tow package. It will be under the vehicle, behind the bumper on the driver's side of the vehicle. If you check out the video I attached you will see what the connector looks like. If all else fails you can install the # C56009 which will bypass the factory trailer wiring and will plug in line with the vehicle taillights instead. I...
    view full answer...
  • Wiring Options for Flat Towing a 2002 Jeep Grand Cherokee Behind a 1986 Gruman/Olsen Delivery Van
    The T-One Vehicle Wiring Harness, # 118381, that you have referenced cannot be used in a reverse type of application like you are describing. But there are numerous lighting options for flat towing a vehicle that will work for you. The right wiring application for you will depend on several factors. There are basically two types of wiring solutions for flat towing. Permanent solutions and temporary solutions. If you plan on towing the 2002 Jeep Grand Cherokee often, you would benefit...
    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...
    view full answer...
  • How to Install a Brake Controller in a 2005 Jeep Liberty
    To install a brake controller in your 2006 Jeep Liberty with a factory 7-Way you will need to hardwire the wires from the back of the brake controller to the vehicle. This vehicle does not have a brake controller port that you can plug the brake controller into. I am including a link to the installation instructions for the Prodigy P2 brake controller # 90885. This is our most popular brake controller because of how easy it is to set up and how well it works. The four wires on the back...
    view full answer...
  • Troubleshooting Trailer Turn Signals that Both Flash when Either Turn Signal is Activated
    I recommend we start by testing the 4-Pole connector on the # 118381 harness. You can use a circuit tester, like # 40376, to test the pins on the connector for each function. This is easiest if you can have a buddy sit in the vehicle and signal the lights while you test for the functions at the connector. I have attached a video showing how to test a 4-Pole connector for you. If the connector doesn't test for the proper stop, turn, and taillight functions, then you will want to check...
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2005 Chrysler Pacifica
    For trailer wiring for your 2005 Chrysler Pacifica you would want the Tow Ready harness part # 118303. This will plug in line with the taillight harnesses of your vehicle. I attached an install video for you to check out as well. For a mounting bracket you would want the part # 18144.
    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...
  • Recommended Trailer Wiring Harness For 2008 Jeep Liberty
    If you have the factory 7-way connector on the rear of your 2008 Jeep Liberty, You may be interested in the T-One Vehicle Wiring Harness, part # 118381, to give you a 4-way connector. I have attached a link to a product review video for this harness you can check out. If you do not have the connector on the rear of your Jeep, I recommend the Tow Ready Custom Fit Vehicle Wiring, part # 118554. This is an easy installation that requires no cutting or splicing and will give yo ua 4-way...
    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...
    view full answer...
  • Recommended Trailer Wiring Harness for 2005 Jeep Liberty
    Of the three harnesses you mentioned, the # 118381 wouldn't work unless your Liberty has the OEM 7-way connector. The # 118381 would plug inline between the 7-way connector and the vehicle wiring harness. If your Liberty does not have the factory 7-way, your choices would be between the Tow Ready # 118524 and the Curt # C55382. Both harnesses would install in the same manner, plugging inline at the point where the taillight assemblies plug into the vehicle wiring. I'd recommend the...
    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...
    view full answer...
  • Installing a Brake Controller and 7-Way on a 2007 Dodge Sprinter RV
    Since your 2007 RV on the Sprinter chassis already has a trailer connector but it does not match either trailer, using the 4 and 7 way installation kit # ETBC7 would be a good idea. This will also provide you with the accessories needed to install the P2 brake controller # 90885. If that green wire does go back to the trailer connector then you will not have to run the blue wire from the connector to the brake controller. You can test it by applying 12 volt power to the wire using a...
    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...
  • 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...
  • 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...
  • Recommended Trailer Wiring Harness for a 2006 Jeep Liberty without Factory Tow Package
    For your 2006 Jeep Liberty that does not have the factory tow package you can use trailer wiring harness # C55382 or # 118524. Both install the same way. I have linked a video to the right showing installation for you.
    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...
  • 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...

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Info for this part was:

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Jeff D
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Jameson C
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