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  1. Custom Fit Vehicle Wiring
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  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118414
Our Price: $39.35
You Save: 47%
Custom Fit Vehicle Wiring

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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. Circuit-protected converter guards against shorts. 1-800-496-5010 to order Tekonsha custom fit vehicle wiring part number 118414 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (34)
  • Q & A (0)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118414

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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. Circuit-protected converter guards against shorts.


  • 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 in rear cargo area
    • Plug in T-connector
  • Includes circuit-protected tail light converter to ensure that your vehicle's wiring matches that of your trailer
    • Provides protection against electrical shorts and overloads
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 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 interior trim panels in your rear cargo area.

Once installation is complete, the 4-way flat connector will be stowed in an out-of-the-way location within your cargo area.

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.

Circuit-Protected Tail Light Converter

A tail light converter is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. The tail light converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

This converter safeguards itself and your vehicle against possible electrical shorts and overloads with integrated short circuit protection. Just install the connector as indicated and rest assured that the wiring system of your vehicle will remain feedback-free.

118414 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118414 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118414

Average Customer Rating:  5.0 out of 5 stars   (34 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. Circuit-protected converter guards against shorts.

2005 Scion xB

easy install...snaps right p erfect.

2006 Scion xB

With a wiring harness this easy to install (including the trailer hitch) there is no reason why anybody can't tow with their small car (I have a 2006 Scion xB). Two plugs and a ground wire. A perfect fit and works perfectly.

They are working great. Thanks.
Neil - 01/24/2018

2004 Scion xB

I ordered 3 items for my 2004 Scion XB. I ordered a hitch, draw bar and wiring harness. I received exactly what I ordered In a short time frame. When I had items put on and had no problems with the items during installation. On the day ordered to the day installed I had absolutely no problems. Thank you to etrailer. I will recommend you to others and will order more from you.

2006 Scion xB

Product arrived after just a bit longer than I initially expected, but with good reason and notification. It was complete and amazingly easily to install, with complete instructions, and seems to work very well. It was also the best price that I could find. Thanks to the good people at etrailer for a good product and great communication. My Scion is obviously not the greatest vehicle for heavy duty hauling, but with this Etrailer kit, it will be more than adequate to pull my very light trailer with my E-Trike and another Bicycle on it. Due to the weight and size of my E-Trike, there just wasn't enough room in the Scion, not to even mention the difficulty to load it, which will be much easier with the added trailer.
Thanks! Bob


Fit perfectly, and works just as advertised.
customer service to help with my purchase when the original product I'd ordered was not available.
Ordered the next best option, and I'm very happy with the results.
etrailer has always been an excellent source for my towing needs.
Only complaint is the draw bar didn't come with a pin, but sourced one locally with no problem.

2006 Toyota Highlander

Every product that I have bought for my 2005 Scion xB and 2006 Highlander Hybrid from etrailer has worked out well. Great products, great directions with video instructions.... thank you!

All products have worked out well. Nice to find everything in one place. I am especially pleased with the hitch and wiring for the Scion xB.
Mark H - 09/18/2018

2006 Scion xB

I haven't towed anything with it yet, so take this review for what it's worth. (If my trailer explodes, I'll note it later on in an updated review.) That said, the product snapped into place perfectly and still allows my tail lights/signals to function. A win.

My only gripe is the instructions could've had more pictures of the actual step-by-step process to help out a pathetic, non-car guy like me understand better.

I've purchased from in the past and have yet to have a problem with product quality, nor their customer service. Will buy from again.

2006 Scion xB

Installed in a couple hours, worked as expected, no problems at all, using it already.

2006 Scion xB

Easy to install. No cutting or splicing. The hardest part is taking everything apart. I recommend taking out the spare and the storage baskets so you can remove the strip along the back. The rear panels then come out pretty easily by just pulling them carefully. Like Pixel said, just take off the nut holding the passenger side rear light for the ground. Another hint not mentioned in the instructions, just thread the driver's side connector through the passenger side access hole, then hide along the bottom and back up through the driver side hole. easy!

2006 Scion xB

The harness itself is well made and works with the Trailer lights outstanding. It's exactly what I needed to pull a small Trailer.
But....while the written instructions are OK the pics need to updated. The instructions seem to be written by the designer, not someone who's actually installed the harness. The kit comes with only two zip ties. I ended up using 8 altogether.

2005 Scion xB

The T-One vehicle wiring harness 118414 was delivered much sooner than I expected and I installed it the next day. I am a "handyman", but certainly not a mechanic The connectors where the harness was to be attached were somewhat hidden, but after I located them, the installation progressed rapidly. The product appears to be of a high quality and I expect to last a long time. Thanks. .


Great kit for this Scion. I wired it up like the instructions say and the end of the cables fit inside the rear storage tray when not in use. Still working great a year later.


Easy to install, works greatThis took me no time at all to install, and worked perfectly.

One suggestion, instead of drilling a hole for the ground screw, remove one of the nuts holding the passenger taillight on and attach the ground wire there.


My second order...... and very fast at my doorstep again! Great service, great products. I will be back the next time I need any towing needs!


Easy to install, Works fine. The only improvement is in the instructions picture "D" could show a little better what panels they are talking about and where the locations of the fasteners are that need to be removed. Maybe a before and after picture would help.

2006 Scion xB

Went in nice ran the lead to the trailer though the rubber plug in the rear body panel so you don't have to run it under the hatch.


Works great!

Stanley - 08/08/2021

2006 Scion xB

All things perfect with clear instructions tailored to my vehicle. Price, on-time, clear and easy – all good.


Everything was delivered in record time and works like a charm, you guys are in my favorites site now and I am pleased to do business with you. I have referred many friends to your site already. Keep up the good work . Marc

2006 Scion xB

Great service! Finally got around to installing it and it works perfectly.


Order arrived exactly as planned. Was able to install in approximately 1 hour following the instructions. Very easy! Thanks.

2005 Scion xB

have not installed yet but looks high quallity idem


Easy peasy, once you get the interior panels off. Clip-clip and you're pretty much done.


2005 Scion xB

These guys shipped a great product real fast. I couldn't ask for more!

Show More Reviews

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

  • Why Does Trailer Wiring for 2005 Scion xB Require Taillight Converter
    So trailer wiring has the turn signals and the stoplights on the same circuit and the running lights on another. Some vehicles are wired like this too but some are also wired where the blinker is on a separate bulb from the brake lights. So the convert the separate style to a combined style a converter box is needed. That's what comes with the trailer wiring harnesses that fit your 2005 Scion xB like the Tekonsha part # 118414 which is a confirmed fit and the best option as it installs...
    view full answer...
  • Using EZ Mount Tow Light Kit on 2005 Scion xB When Bike Rack Blocks Tail Lights
    If the bike completely obscures one of the tail lights so that it is not visible at all through the bike, then using the Roadmaster # RM-2120 would be a great solution. As you said, you would also need the T-One Harness, # 118414 to provide a connection for the EZ mount lights to plug into. Installing the harness is a straightforward procedure, as you can see by looking over the installation instructions that I have linked to.
    view full answer...
  • Hitch and Wiring Recommendation for a 2006 xB
    The Curt Hitch # C11487 that you referenced would be an excellent choice for a hitch for your 2006 Scion xB. This hitch has more than enough capacity for your 800 lb tent trailer and comes with a 2 inch ball as well. I attached installation instructions for this hitch for you to check out also. For a 4-way wiring kit that is confirmed to fit your vehicle and is plug and play I would recommend the # 118414. I attached installation instructions for this product as well.
    view full answer...
  • Installing Trailer Wiring Harness on 2006 Scion xB
    The Curt # C56175 trailer wiring harness you mentioned is not a vehicle specific item, it can be used with many different vehicles and therefore there are no vehicle specific instructions available. To install the wiring harness, having a circuit tester like part # 40376 would be very helpful. Locate the wiring harness feeding both of the taillight assemblies. You might need to do some disassembly in the cargo area of the vehicle or remove the taillight assemblies as if you were replacing...
    view full answer...
  • Can a 2006 Scion xB with a Curt Hitch Tow a Sailboat and Trailer that Weigh 400 lbs
    The Curt Trailer Hitch # 11487 that you referenced has towing capacities of 2,000 gross trailer weight and 200 lbs tongue weight. If your sailboat and trailer only weighs 400 lbs and you can lift the tongue of the trailer with one hand this hitch should be more than adequate for your 2006 Scion xB. I attached installation instructions for this product for you to check out. It would still be a good idea to check the tongue weight of your trailer when its loaded just to be sure. I linked...
    view full answer...
  • Does the Muffler Have to be Removed to Install a Trailer Hitch on a 2005 Scion xB
    According to the installation instructions for CURT Trailer Hitch, # 11487, you will not need to remove the muffler in order to install the hitch on your 2005 Scion xB. I have included a link to the installation instructions for you to view. The hitch comes with a ball mount, hitch pin, and clip. If you plan to do some towing you will need a ball, # 19256 (1-7/8 inch diameter) or # 19258 (2 inch diameter). For trailer wiring, use T-One Vehicle Wiring Harness, # 118414. I have included...
    view full answer...
  • Hitch and Trailer Wiring Recommendation for 2005 Scion xB
    For your 2005 Scion xB the hitch I recommend is the Curt # C11487 which has a concealed crosstube for a more concealed look! For trailer wiring the best option is the Tekonsha kit part # 118414 which is very easy to install and has a converter box that is widely considered to be the most reliable one available. For a hitch ball you'd need just the part # A-80 and you'd be set.
    view full answer...
  • Hidden Trailer Hitch Recommendation for 2006 Scion xB
    Yes, if you install a trailer hitch on your 2006 Scion xB you would be able to connect to a rental trailer. I really like this hitch as it's totally hidden when not in use. You'd need to use the ball mount part # 28451 and for hitch balls part # 19258 for a 2 inch ball or part # 19256 for a 1-7/8 inch ball. For trailer wiring you'd then want the Tekonsha kit part # 118414 which installs easily without splicing and has a very reliable converter box. To help with rear suspension sag when...
    view full answer...
  • Correct Trailer Hitch Fit for a 2006 Scion xB
    The only available trailer hitch we offer for a 2006 Scion xB is the Curt Trailer Hitch Receiver part # C11487 which is a direct bolt-on fit with no drilling required. This trailer hitch has a class I, 1-1/4" receiver which can be used for towing (if applicable) or hitch mounted accessories like bike racks and cargo carriers. If you will be towing however you'll also need the T-One Vehicle Wiring Harness part # 118414 and Curt Towing Starter Kit part # C45147. Unfortunately, there are...
    view full answer...
  • Parts Needed to Tow Trailer with 2 inch Coupler Ball with 2006 Scion xB
    We have exactly what you'll need to tow your trailer that has a 2 inch coupler ball with your 2006 Scion xB. You'll want to first start with a hitch which for that the Curt # C11487 would be exactly what you would need. For a ball mount you'd then want the part # C45521 and then for a 2 inch ball part # A-82. Last thing you'll then want is trailer wiring. Which for that the T-One harness part # 118414 and you'd be set.
    view full answer...
  • Trailer Hitch and Wiring Recommendation for a 2006 Scion xB
    We do have trailer hitches that will fit your 2006 Scion xB but # C12490 only goes back to 2008 models. For your 2006 you can use the Curt hitch # C11487. If you plan on doing any towing the correct ball mount to use is # 3593 . For a 1-7/8 inch ball use # 19256 and for a 2 inch use # 19258. For trailer wiring use # 118414. Keep in mind the tongue weight capacity of the hitch is 200 pounds and the gross trailer weight capacity is 2,000 pounds. Unfortunately there is not an available adapter...
    view full answer...
  • Trailer Hitch Receiver for 2006 Scion xB
    There is only currently one hitch option for your 2006 Scion xB. It is the Curt Class 1 # C11487. This has a 1-1/4 inch receiver tube for a ball mount or accessory like a bike rack. If you are planning on towing a light trailer, I recommend the ball mount # C45521, pin and clip # F-4, and Hitch ball # A-80. You will also need the wiring harness # 118414 which will plug into the factory wiring harness behind the trim panels on each side of your cargo area.
    view full answer...
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  • Everything Needed for a 2006 Scion XB to Tow a Small Trailer Carrying a Motorcycle
    For your 2006 Scion XB, I recommend starting with the Curt Trailer Hitch Receiver # C11487. This is a custom fit and will use ball mount # C45521, along with pin and clip # F-4 and ball # A-82. The wiring harness for your vehicle is T-Connector # 118414 which will connect to the factory wiring behind the trim panels in the cargo area on each side. Then you simply need your small trailer with a 2 inch coupler to match the hitch ball and you'll be good to go. You may want to consider a...
    view full answer...
  • Can the Tongue Weight of a Vehicle Be Increased
    I may have a solution for you to haul your TVs, but there is no way for the tongue weight of a vehicle to be increased. To start, the tongue weight refers to the amount of weight that can be added to the frame of the vehicle safely, so there isn't a way to add to that capacity. With that said, the Curt # C11487 would be a great hitch for your 2006 Scion xB because of the durable powder coating that Curt hitches come with. Once you've got the hitch, you would need to get a small utility...
    view full answer...
  • Recommendation for Carrying a Pronto M91 Electric Wheelchair with a 2006 Scion xB
    With the 2006 Scion xB having a maximum tongue weight capacity of 200 pounds, I am going to suggest a different option to pull the Pronto M91 electric wheelchair. You will need to start the same way with a trailer hitch, like the Curt # C11487, but you will need a few more parts to complete this set up. From here you will need a ball mount, like # C45521, a pin/clip to keep it in the hitch, # F-4, and a 2" ball, # A-82, to install in the ball mount. You will also need a wiring harness,...
    view full answer...

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