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

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

Item # 118768

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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118768 - Custom Fit - Tekonsha
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  • Custom Fit
  • Trailer Hitch Wiring
  • Tekonsha
  • 4 Flat
  • Powered Converter
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. Powered ModuLite reduces strain on wiring system. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118768 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.


  • All Info
  • Reviews (2)
  • Q & A (3)
  • Videos (1)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118768

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. Powered ModuLite reduces strain on wiring system.


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
    • Locate connection points in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 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 in your rear cargo area. You will have to remove the rear threshold and some interior lining to access this harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


Once installation is complete, the 4-way flat connector will be stowed in your rear 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.


ModuLite Powered Tail Light Converter

A ModuLite power module 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. This power module functions as a tail light converter to combine 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.


With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118768 Tekonsha T-1 T-Connector - 4 Wire



118768 Installation InstructionsInstallation Details 118768 Installation instructions

This Product Fits The Following Vehicles

2018 - 2019 Subaru WRX



California residents: click here


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 Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 118768 Review

Speaker 1: Today we're going to take a look at the T1 vehicle wiring harness with the four-way flat trailer connector. Now this is a custom fit part. It is designed to fit the 2018 Subaru WRX and on a custom fit part I always like to recommend for you to go to our website, use our fit guide, put in your year and model vehicle and it'll show you if this'll work for your application.Now this harness will provide this four-way flat trailer connector at the back of your vehicle to power your trailer's signal lights and it is compatible with five pole, six pole and seven pole adapters that we do sell separately on our website.This does connect very quickly and easily. Basically you just locate your connection points in the rear cargo area, plug in these T-connectors, one on each side, one on the driver's side and one on the passenger's side, ground your white wire and then run your power wire to your vehicle's battery.This harness does include this module light, this black box here, and this is to ensure that your vehicle's wiring will match that of your trailer. It is a powered module, that's why it'll connect directly to the battery, and they do that to avoid overloading your vehicle's electrical system.This is constructed of a 16 gauge bonded wire that the four way's connected to that'll run out the back and plug into your trailer. And if you notice on the four-way it does come with a nice dust cap that you can just put over those terminals to protect them when you're not using them and protect them from any elements or from any corrosion.A few specs on this harness, the maximum amperage on the stop and turn light circuits is 4.2 amps per circuit and on the tail light circuit it's 7.5 amps.

Now it does come with everything shown here on the table. It has a nice set of detailed instructions that'll describe how to install it and even give you pictures of how everything connects.But just basically what you'll end up doing is you'll go again to the rear of the vehicle, get into the rear cargo area and then you'll gain access behind the rear tail lights and you'll want to start on the driver's side and you'll take this T-connector that has the yellow wire in it, that's for the driver's side, you'll unplug the harness from the tail lights, plug this in, T this in between there and then you'll take the one for the passenger side that has the green wire in it, and you'll see it's a length of wire. This will run all the way over to the passenger side and you'll plug this in behind the tail light the same way.Now what you want to do is this box, you don't want this bouncing around, you want to attach it to a nice flat surface so it doesn't bounce around, so they include this piece of double-face tape that you can put on there and attach it down if you need be. They also have a little bracket here with a hole in it, you can put a screw in there to attach it down. You just don't want it bouncing around.Then you can run this bonded wire with the four-way out the back towards the trailer and again you have these two wires left.

The white wire you can see has an eyelet on it, that's easy to connect to a nice clean ground, and then the last wire, this black wire is the power wire, this'll need to run to your vehicle's battery.So to do that they give you this extra length of wire to run it up to the front of your vehicle, and some connectors. So what you want to do is take one of your butt connectors, put it on the power wire and then take your length of wire, connect it to one end there, and then run that length of wire all the way up to the front and when you get to the battery you don't want to connect this directly to the battery, you want to run it through this in-line fuse holder.So take the other butt connector, put it on there, connect to one end of the fuse holder just like that, and then your other end of the fuse holder you'll take this eyelet connector, attach it, and then that's what'll connect to your vehicle's battery.Once that's all connected, pop open the fuse holder, they include the 15 amp fuse, that you just need to insert into your fuse holder, put the cap back on there and you'll be all ready to go. They do include some extra zip ties or cable ties that take up any slack in the wiring.But that should do it for the review on the T1 vehicle wiring harness with the four-way flat trailer connector.


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118768

Average Customer Rating:  4.5 out of 5 stars   (2 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. Powered ModuLite reduces strain on wiring system.

- 118768
by:

Good instructions, not horribly hard to install,. Package was complete. 641803



- 118768
by:
2018 Subaru WRX

As usual, use real soderless connectors, NOT the ones in the kit. 514892


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Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

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


  • Recommended Trailer Hitch Receiver and Wiring for 2018 Subaru WRX
  • For your 2018 Subaru WRX, the EcoHitch Invisi Trailer Hitch Receiver # 306-X7257 is a confirmed fit. There is no drilling required, but there is some minor fascia trimming and heat shield trimming required. This hitch will be hidden and will use the factory knockout panel location. I've attached a photo of this fit to assist as well. For your wiring harness, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118768 which is a confirmed fit. This custom-fit...
    view full answer...

  • Trailer Hitch Recommendation for 2018 Subaru WRX That's Hidden Behind Bumper Panel
  • Yes, for your 2018 Subaru WRX we have the EcoHitch part # 306-X7257 that installs behind the rear appearance cut out like you mentioned. If you check out the attached picture you'll see a ball mount going through the opening in the bumper and attaching to the hitch. This hitch also fits the STI models too. If you need trailer wiring too the kit I recommend is the T-One part # 118768 because it installs without requiring any splicing and because it has the most reliable converter box...
    view full answer...

  • Trailer Hitch and Wiring Recommendation for 2019 Subaru WRX
  • The trailer hitch I recommend for your 2019 Subaru WRX is the EcoHitch part # 306-X7257 as it has a 2 inch opening and the best towing capacities. What's also really great is that it installs behind the bumper access panel which gives you a hidden look when not needed plus better ground clearances compared to other hitches that hang below the rear bumper. I attached an install video for this for you to check out as well. Then for trailer wiring the best kit is the Tekonsha part # 118768...
    view full answer...


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




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Info for this part was:

Edited by:
Lindsey S
Installed by:
Jeff D
Written by:
Alexander C
Updated by:
Isabelle B

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