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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 # 118457
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Custom Fit Vehicle Wiring

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Tekonsha Custom Fit Vehicle Wiring - 118457
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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. 1-800-496-5010 to order Tekonsha custom fit vehicle wiring part number 118457 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 (47)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118457

  • 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 the tail light assemblies to access this harness.

T-One Connection Location Points Behind Tail Lights

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.

118457 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118457 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 - 118457

Average Customer Rating:  4.7 out of 5 stars   (47 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.

2010 Ford Focus

Was Easy Plug and Play, installed in less than 10 min Would recommend for anyone with 2008 Ford Focus SE who needs towing installed this one is the best and easiest to install your self.

2011 Ford Focus

Trailer hitch and instructions were top notch as was the wiring kit. Would do business again if the need arises.

I still like them just fine. Never an issue with either the hitch or the lights. Thanks
Chris D - 04/19/2018

2008 Ford Focus

The whole experience was great. Purchased a hitch and wiring harness for my son's ford focus so he could tow a small trailer to support his move to Florida.This turned out to be the most affordable and convenient option available.

This installation of all the pieces was simple, the instructions were easy to follow and his trip went without incident.

I would highly recommend these products to anyone.


Installation of the T-one wiring harness required attention to detail but was otherwise straight forward. The etrailer videos were most helpful. The T-one wiring harness with 4 pole flat trailer connector has worked well during our rental of several Uhaul trailers.


First off l seldom give a 5 rating on anything. This wiring harness is a must when installing wiring for a trailing. It was easy to install even though instructions were a bit lacking. Would be nice if tie down were longer & wire protective tubing was supplied for safety reason to prevent wires rubbing against metal edges. I wrapped most of the wires to be safe. Be sure to get mount bracket for connector. I give this kit a 4.5 overall!

2008 Ford Focus

Other than UPS not noticing the apartment number in my address and getting it a day late, very fast delivery. The box was a little damaged but the product was unharmed. I had a friend install it for a case of beer...he's pretty mechanically inclined, so it was not too difficult for him to install. The only thing he had a little issue with was getting the wiring installed. To get the hitch and wiring installed, it took about 1.5 hours, including breaks and not using a lift like a professional shop would have.

I bought this so I could update/upgrade my current bike rack to a more stable one, and use a trailer if needed. I don't have the rack yet, and won't be moving for a month or so, but I have a feeling I'll be glad I have the hitch when the time comes.

2011 Ford Focus

Installation not too difficult, however the wiring is all exposed under the vehicle and not through the trunk as in normal trailer wiring.
The exposed receptor wire just hangs down behind the bumper and somehow must be stored so it does not get snagged on anything. Looks bad wrapped around the hitch and all exposed!

2011 Ford Focus

It's a wiring harness so there's not much to say. The wiring harness was an exact fit to my car. The instructions were clear and accurate. It was easy to install and it works. Exactly what I hoped for.


Great product! Installation very simple. Instructions very easy to understand.
I had a technical question about possible circuit overloads and the folks
@ e trailer were very helpful too.
Excellent tracking during shipment as well.

I will make this my first stop for any future need.
Strongly recommended!

2008 Ford Focus

I installed the Curt hitch and T-One Wiring Harness. Both great products and installed easily. A tip for anyone doing the same on a 2008 Ford Focus, would be to do the wiring harness before the hitch. I put the hitch on first and it was in my way for doing the wiring.

2011 Ford Focus

Worked on my 2011 Ford Focus perfectly. I am not an auto guy and installation was super simple and easy. Very little tools and no special ones. Would highly recommend. Using etrailer, this is my 3rd time. Each time has been the same. Easy to shop, right product, shipped on time.

2011 Ford Focus

I bought this harness for my 2011 Ford Focus. It is a basic harness, and construction seems to be good. The wires are plastic and not silicon, but what can you expect for the inexpensive price.

The installation time was about 45 minutes. The video on your site was helpful, but you guys make it look so easy. The hardest side to install is the drivers side. To avoid chaffing, make sure you carefully consider where you run the wires.

I gave it four out of five do to the zip ties being too small. I had to get larger one.


very pleased with product was even able to change the location of the zip ties so i was able to keep the wiring inside the vehicle instead of outside and in the elements.

2010 Ford Focus

Wiring harness was great, easy fit up, they have it together.!!!!

2008 Ford Focus

Installed on my 2008 ford focus without any issues. Completely satisfied with the install and product. Highly recommended.

2009 Ford Focus

Easy to install was pretty fast


A quick and proper tie in for hooking up trailer lights after installing a tow hitch. Good quality and no messing around.

2008 Ford Focus

The wiring for my trailer light were exactly what i needed. I order 2008 ford focus wiring for trailer hookup. Highly recomeend

2010 Ford Focus

everything that i have purched from etrailer has been very good....

2010 Ford Focus

Access to the connectors was a bit of a hassle but that is Fords problem. Cable was easy to route and the connectors fit perfectly.

2009 Ford Focus

I've been using this for a year. Works great. I didn't even try installing it myself but my mechanic had no problems.

2009 Ford Focus

Plug and Play. Still works great and was easy to install.


Items were packaged well for shipping and installation was without problems.

2011 Ford Focus

Excellent product prevents the need to cut solder or splice vehicle wiring. Very prompt receipt of the order

2009 Ford Focus

Went in just as described in the short video. Nice not to splice the wiring together. Thanks.

Show More Reviews

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

  • 2008 Ford Focus Turn Signals Blink Faster when Connected to a Trailer with Wiring Harness 118457
    When the trailer is connected and you use the turn signal, or any of the lights, there is more power draw on the vehicle system and that might be leading to the blinkers going faster. Also check the main ground for the wiring harness # 118457, just to be sure you do not have a developing ground issue. Check the trailer lights to determine how much amperage they draw for each function. Then check to see what the tail lights on the vehicle can handle. You do not want to overdraw the wiring...
    view full answer...
  • Will the Tow Ready Custom Wiring Work on a 2010 Ford Focus Without Overloading Tail Light Circuits
    The T-One Vehicle Wiring Harness with 4 Pole Trailer Connector # 118457 that you referenced would work on your 2010 Ford Focus without overloading the tail light circuitry. Check out the product reviews for this product, there are a number of people who have used this product on Ford Focuses and had it work very well for them. LED lights draw a very minimal amount of amperage when compared to incandescent bulbs, and since the towing lights you would be using are LED you would definitely...
    view full answer...
  • Trailer Wiring Harness Options for 2007 Ford Focus
    The Tow Ready # 118457 T-One connector you referenced is not compatible with a 2007 Focus, as the taillight assemblies were a bit different. For the 2007 model, you'd need to hardwire the trailer connector, using part # 18252. The installation is pretty simple. All you'll need to do is use the circuit tester included in the kit to determine which circuit serves which lamps, and tap the green wire into the right turn circuit, yellow wire into the left turn circuit and brown wire into the...
    view full answer...
  • Custom Fit Trailer Wiring Harness for 2007 Ford Focus Hatchback
    We do have a custom trailer wiring harness that is a fit for your 2007 Ford Focus Hatchback. For that you would want the Hopkins kit part # HM11140495 which is a confirmed fit. The # 118457 only fits the coupes and the sedans though. The taillights are different between the hatchbacks and the sedans/coupes.
    view full answer...
  • Fit of Draw-Tite Class I Trailer Hitch 24805 on 2008 Ford Focus
    The Draw-Tite Class I hitch you referenced, part # 24805 is a fit for both the coupe and the sedan models of the 2008 Ford Focus. The hitch has a 2000 lb towing/ 200 lb tongue weight capacity (tongue weight is the amount of weight pushing down on the trailer ball). This capacity could be limited by the towing capacity of your Focus, if it's less than 2000 lbs. Check your owner's manual or with your Ford dealer for the towing capacity of your Focus. To complete your towing set-up, you'll...
    view full answer...
  • Do I Need to Trim My Bumper for Draw-Tite Class 1 Hitch # 24805 to Fit 2009 Ford Focus Coupe
    I contacted our representative at Draw-Tite to double check and he informed me that The Draw-Tite Class I Frame Trailer Hitch Receiver, part # 24805, does not require any trimming of the lower valence in order to fit. If you have the factory bumper with no dealer add on valence then part # 24805, will fit your vehicle perfectly and will require no trimming of the bumper. Some items you may need to complete your Class I towing setup are listed below. Drawbar, part # 3593 Hitch Ball 1-7/8...
    view full answer...
  • Towing 1000 lb Maximum PWC and Trailer with 2008 Ford Focus
    The Draw-Tite Class I hitch you referenced, part # 24805 would have a 2000 lb towing and 200 lb tongue weight capacity. Although the hitch would be physically capable of towing your PWC trailer, you will be limited to the capacity of the lowest rated component in the towing system. The decision is ultimately yours, but I cannot personally recommend anything that would contradict the vehicle manufacturer's recommendations. If you decide to tow your PWC, you'd also need the following: Trailer...
    view full answer...
  • Could 2010 Ford Focus Tow Jet Ski Trailer with Curt Hitch
    As long as the towing capacities of your 2010 Ford Focus (check owners manual) and the Curt hitch part # C11319 don't get exceeded you could tow a jet ski trailer. This hitch has a 2,000 lb trailer weight capacity and 200 lb tongue weight capacity. Typically jet ski trailers are much lighter than that. For a 1-7/8 inch ball mount you would want the part # C45571 or for a 2 inch ball mount part # C45572. For trailer wiring you then would want the part # 118457.
    view full answer...
  • Installation Warranty and Transmission Cooler Recommendation for Trailer Hitch on a 2010 Ford Focus
    The Draw-Tite Class I Frame Trailer Hitch, item # 24805, is bolted to the vehicle frame using existing holes. No drilling or welding is required. All installation hardware to connect the hitch to the vehicle is included. You will need to trim a small amount the heat shield around an attachment hole (see helpful links). The hitch has a towing capacity of 2,000 pounds and a tongue weight capacity of 200 pounds. You will need to check your owners manual for the towing capacities of your vehicle. A...
    view full answer...

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Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Dustin K
Video by:
Dustin K
Employee Jacob T
Video Edited:
Jacob T
Employee Andrew L
Video Edited:
Andrew L
Employee Rick A
Test Fit:
Rick A
Employee Brent H
Test Fit:
Brent H
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
Updated by:
Isabelle B
Employee Cole B
Installed by:
Cole B

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