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. Call 800-298-8924 to order Tow Ready Custom Fit Vehicle Wiring part number 118457 or order online at etrailer.com. Free expert support on all Tow Ready 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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Custom Fit Vehicle Wiring > Trailer Hitch Wiring > No Converter > 4 Flat > Custom Fit > Tow Ready

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

Tow Ready Custom Fit Vehicle Wiring

(27 reviews)

Code:   118457



Custom Fit Product

Shipping Special

Shipping Weight: 0.85 pounds


Tow Ready Custom Fit Vehicle Wiring - 118457

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

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.

Video Transcript for Trailer Wiring Harness Installation - 2008 Ford Focus

Today on our 2008 Ford Focus, well be installing the Tow Ready Custom Fit vehicle wiring harness, part number 118457.Now to begin our installation, we'll open the trunk. With the trunk open, we'll need to temporarily disconnect the drivers side tail lamp. To do this, we'll undo the two plastic screws here on the drivers side holding in the plastic trim just behind the taillight.Then using some gentle force, we'll pry the trim away where we can move it off to the side. We'll then take a 10 mm socket and remove the two nuts off the taillight studs here.With that done, we'll use a pry tool to pry back on our taillight and remove it from the vehicle. Now this exposes our connector here that we'll T into. Now with our drivers side taillight out, we'll go ahead and repeat the same procedure and remove the passenger side taillight.Now that we have both taillights out, we'll take our new wiring harness and we'll route our four pole and the connector with the green wire to it down underneath the vehicle through the hole here between the body and the bumper cover.

We'll take the connector with the yellow wire in it where we can now remove the factory connector from the back of the taillight, take our new connector, plug it into the taillight and the other side into the factor wiring. With that done, we can now go ahead and reinstall our drivers side taillight. We'll also go ahead and reinstall the inside panel as well.We'll now move underneath the vehicle where youll see here on the drivers side between the body of the vehicle and the rear bumper cover is the harness that we routed down. We'll pull it down and route it over toward the passenger side of the vehicle. Now the four pole will stay in the center of the vehicle here by our receiver tube.

We'll take the green wire and continue over towards the passenger side where we'll pass it up through the hole between the bumper cover and the body of the vehicle towards the passenger side taillight opening. Well reach down and pull it up where we can now attach it to our passenger side taillight by removing the factor connector and installing the T1 connector in.Now here on the passenger side, youll also notice that there is a white wire with a ring terminal. This is a ground wire. We'll need to find a suitable ground here on the body of the vehicle and using the self tapping screw that comes with the kit, we'll ground the white wire. Now with the white wire grounded and our connection made, we'll go ahead and reinstall our passenger side taillight the same way we did the drivers side.Now with everything done here in the trunk, we'll go ahead and close the trunk deck lid and move back underneath the vehicle.

Underneath the vehicle here, all we'll need to do is to clean up our install look using a few zip ties. We'll tie the wiring harness up to make sure it stays out of the way. We'll also go ahead and use the cover for the four pole to hook it to our hitch.Once we have everything secured, we'll go ahead and take a pair of side cutters and snip off the excess zip tie which will complete our installation of our T1 vehicle wiring harness with four pole connector part number 118457 from Tow Ready on our 2008 Ford Focus.

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118457

Average Customer Rating:  4.7 out of 5 stars   (27 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.

- 118457

by: P.S.03/25/2015

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. 180764

- 118457

by: Stoo08/08/2012

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! 50957

- 118457

by: Thomas P10/05/2011

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! 25127

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by: Kevin09/05/2012

My wife and Installed the hitch in a little over an hour. If fit pretty good. It took a little longer because we did it on the ground. This made it harder to lift into placed. The video from your web site was a great help. I would recommend this product and your company to any do it yourself-fer out there. 53970

- 118457

by: RW05/17/2011

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. 14463

- 118457

by: Jim H.06/05/2012

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. 42847

- 118457

by: Tyler W08/26/2012

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. 53063

- 118457

by: Brooks03/16/2011

This is exactly what I needed. Easy, quick, and cheap. The staff got it to me very very quickly and it matched up exactly like I expected it to. Great product at a great price. 9538

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by: Rob S.09/22/2013

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. 100965

- 118457

by: DAVID A. VON ROEMER06/16/2012


- 118457

by: Bud M.08/05/2012

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. 50617

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by: Chris R.08/17/2012

Great customer service and follow up, Recieved product no problems, Highly recommend and I will be using them in the future. 52128

- 118457

by: Pat C.03/22/2013

A quick and proper tie in for hooking up trailer lights after installing a tow hitch. Good quality and no messing around. 72017

- 118457

by: Stephen B.02/24/2015

Excellent product prevents the need to cut solder or splice vehicle wiring. Very prompt receipt of the order 175992

- 118457

by: Tom V07/02/2013

Very easy to install. Only wish it could be ran inside trunk rather than stuffed up behind bumper. 87049

- 118457

by: Dwight M.05/01/2015

Went in just as described in the short video. Nice not to splice the wiring together. Thanks. 189335

- 118457

by: Big Al03/09/2011

Order my hitch and recieved it the next day. I am very happy with the product and the service. 8920

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by: Dale Heideman05/27/2014

Excellent product, good price, speedy delivery What more could one ask? 132596

- 118457

by: Alan08/14/2011

Instructions were well written, I had no problems installing the wiring. 21845

- 118457

by: Chad04/18/2011

Easy to install. Was at my door in less than 5 days. 11901

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by: Hoyt06/14/2015

Fit easier than I anticipated. Works pe rfectly. 203312

- 118457

by: Dillon07/30/2012

Plugged in and worked great, easy to in stall! 49782

- 118457

by: tom d05/13/2011

easy to use in a difficult situation 13873

- 118457

by: Laert M09/23/2011

Fits perfect on my 2010 Focus SES. 24391

- 118457

by: sean w07/01/2012

good product super easy to instal 46433

- 118457

by: Jeff P07/15/2012

Works great on my 5'x8' trailer 48005

- 118457

by: james johnson04/14/2012

easy install 37178


Ask the Experts about this Tow Ready Custom Fit Vehicle Wiring
Do you have a question about this Custom Fit Vehicle Wiring?

  • 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...
    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...
    view full answer...

  • 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...

  • 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...

  • 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...
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?

Info for this part was:

Expert Research:
Michael H

Expert Research:
Jameson C

Video by:
Joshua S

Test Fit:
Rick A

Video Edited:
Andrew L

Updated by:
Laura H

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