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

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

Item # 118764
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Our Price: $115.88
Custom Fit Vehicle Wiring

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Tekonsha Custom Fit Vehicle Wiring - 118764
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In Use/Installed

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 800-298-1624 to order Tekonsha custom fit vehicle wiring part number 118764 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 (35153)
  • Q & A (17)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118764

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Tekonsha
  • 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.


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 behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite power module that 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: 5 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 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 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 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.


ModuLite Power Module

A ModuLite power module is built into this T-One connector. 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.



118764 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118764 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 - 118764

Average Customer Rating:  4.8 out of 5 stars   (35141 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.

- 118764
by:

4 star review reason being the male and female ends on the harness didn’t exactly line up correctly so I had to break a fin off of each side for them to slide in smooth and click together. Watching the Video before hand on the install was super helpful I had it done it 2 hours. But the fact I had to break the female end fins off on my connectors didn’t make me too happy. I should of took a video of myself doing it to prove it



- 118764
by:

If you have a good mechanical/electrical background the install is very easy and straightforward. The product works as it should and took just under 1 hour to install.



- 118764
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- 118764
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Great



- 118764
by:

You did a great job. Hitch is on car and fits great. Would order from etrailer again.



- 118764
by:
2020 GMC Terrain



- 118764
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2018 GMC Terrain

I ordered this, but discovered that I didn't need it after all. The 2018 GMC Terrain that I bought actually had the factory wiring so I ordered the Curt C56375 instead - cheaper and easier to install. I only found out that I had the wiring when I took off the bumper fascia and saw the factory connector. There was no mention of this on any of the GMC paperwork or invoice from the car purchase.



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- 118764
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- 118764
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2021 GMC Terrain



- 118764
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2018 GMC Terrain

Installation went smoothly. Had everything we needed!



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- 118764
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Exactly what is needed for 2019 and up electrical systems



- 118764
by:

Excellant fit and easy installation.



- 118764
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2019 GMC Terrain

Arrived very quick. Looks to be made very well. Have not installed yet



- 118764
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2018 GMC Terrain

Great product......easy install



- 118258
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Product quality very high, delivery very fast, shipping container (cardboard box) was not strong enough to support handling/shipment, box bottom was ruptured with hitch assembly hanging out, box should be supported stronger, no parts missing, hitch was scratched up somebut, nothing that a little black paint didn't fix. I installed the wiring harness connections and fuse box on the external side of the vehicle to eliminate having to take apart the internal sheet metal panels and providing easy access to the fuse in the event of fuse failure, this eliminates the necessity of interior Panel removal to change a fuse. Easy installation, product has great great design features ,great customer service with prompt delivery. Just ordered the bracket (#18140) to secure the 4 prong plug to the hitch neatly and secure to eliminate the loose plug. (not shown in photos (Bracket in transit),


Comments
Great, works like a charm.
Anthony J - 09/27/2020


- 118241
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Becuase if this website it was easy to find what was needed for my truck to tow. Very detailed installs online. The best part was everything was bolt in and no drilling required along with plug and play wiring harness. Definitely will be another custom tee in the future!



- 118252
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Just installed Draw Tight hitch, wire assembly along with the brackets for a nice look. Everything went smooth with installation and it has a nice clean look as the hitch is well hidden. This is going to work for our bike rack and the cargo carrier I am now going to by. Now I can also get a small utility trailer to pull and haul stuff. I strongly recommend etrailer for all your needs as they communicated with me the whole way through and readily replaced a lock unit that somehow came without the key. Customer service is top notch.


Comments
Absolutely Fine!
Scott N - 04/26/2020


- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


I purchased this for my 2013 Honda Pilot EX-L. I have not used the wiring harness yet, but the installation was extremely easy and quick. The instructions were very straightforward, and I was able to install everything within 30 minutes. Everything you need is inside the package except some bolts/nuts to mount the connector. I decided to cut out a hole and drill some holes for bolts. I opted for some black ones to match the colors. I'm extremely happy with this product and etrailer's fast and reliable service.



- 118264
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This is a perfectly tailored product for the do-it-yourselfer who with a little help adds a nice hitch to his vehicle. Getting an older vehicle's OEM installed weld nuts clean takes most of the time followed by installing the two washers and nuts in the fascia area. That part needs patience as the work area is limited. The Curt LED 4-Way Flat Connector (Vehicle End) Tester makes it very simple to verify the Tow Package - 4-Pole Flat Trailer Connector that is a snap to install to the vehicles pre-existing harness. One point to pay attention to in the instructional video is when pulling the square washer and bolt through the channel. They must slide in single file as shown. If you try to pull with the bolt through the washer it will get stuck and you will need to fish it out. So bottom line. Great product. Great support. Steve Stewart


Comments
Everything from the hitch to the wiring still works perfectly. Very pleased with the results
Stephen - 05/07/2020


- 118248
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Wish I bought etralier's tow harness earlier. Easy installation. Toyota dealership sold me the wrong one and of course waited too long to return. But use some of the parts from that harness on the one from etrailer(see pics). Would order again from etrailer. Thank you



- 118269
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Plug & play for 2020 Kia Sorento. Dinged a star because the trailer connector does not fit the extra bracket well. It does not appear to have been designed for a bracket mount. I had to force fit and secure in place with a zip tie.



- 118266
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Good product and great service from etrailer! !!!Important note: 2012 Nissan Xterra (depending on what factory it was built) has the 12v power and brake wire REVERSED on the factory installed harness. Meaning when you plug in your trailer, there will be constant power to the brakes on no power to the charge line. If this happens to you like it did to me, you need a tester and a couple butt connectors to make the switch at the 7 pin connector. Also note, these plugs use the trailer for the ground so you're tester wont read if the trailer is not plugged in and you have to hold one of the tester ends to metal on the trailer.


Comments
Thank you for your review. This is a common issue on the Nissans. I have attached a very helpful article that explains the issue and how to fix it.
-- Etrailer Expert Heather A - 05/12/2021


- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Needed a harness for my 2015 Honda Pilot LX and didn’t want to pay a king’s ransom for dealer parts and install. Ordered from etrailer and got a deal. Came with everything I needed and also had excellent, easy to understand instructions. Works perfectly.


Comments
This harness has worked like a charm. No problems at all.
Randy B - 06/01/2020

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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • How To Tell If a 2020 GMC Terrain Has the Factory Tow Package for Trailer Wiring
    In order to determine if a 2020 GMC Terrain has the factory tow package you will need to take a look in the rear fuse box on the driver side of the vehicle. In the fuse box there will be two locations you need to check, K2 and K3 which are for the trailer lights. These slots should be empty but what we are looking for is silver terminals inside each of the holes for the prongs on the relay. If there are silver terminals then you have the factory tow package but if not then you do not have...
    view full answer...
    Image 1 for
  • Wiring Harness for 2019 GMC Terrain Without Factory Tow Package
    There is a wiring harness for your 2019 GMC Terrain, though as of this writing (August 2019) there is not an option from Curt. Instead you will need the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118764. This is made by Tekonsha which is regarded by many as having the most reliable wiring harnesses in the industry so you will be getting a great product. If you are looking to tow you can add a trailer hitch with the Draw-Tite Trailer Hitch Receiver # 76419 for a...
    view full answer...
  • Recommended Trailer Wiring Harness for a 2020 GMC Terrain
    I have two trailer wiring harness options for a 2020 GMC Terrain, the T-One Vehicle Wiring Harness part # 118764 if you don't have the factory tow package or part # 118285 if you do. These options both contain a 4-way flat trailer connector which is the most common type and most likely what you need. If you don't already have a trailer hitch picked out, the Curt Trailer Hitch Receiver part # C77FR is a great option.
    view full answer...
  • Best Trailer Hitch Receiver for 2020 GMC Terrain
    The best trailer hitch for your 2020 GMC Terrain is the Draw-Tite Max-Frame Trailer Hitch Receiver # 76028. This is the best for your GMC because it has the best ground and bumper clearances, and because it has a concealed crosstube which means you will only see the receiver portion of the hitch, which helps keeps your Terrain looking stellar. This hitch fits both the diesel and non-diesel models of 2020 GMC Terrain, and I have added a link to a video install for you of the Draw-Tite...
    view full answer...
    Image 1 for
  • Are Extra Relays or Fuses Needed to Use Curt Trailer Wiring Harness on 2020 GMC Terrain
    I can understand how the wording could be confusing on whether or not the Curt # C94FR (56429) will work on your 2020 GMC Terrain, but I can confirm that it will indeed work for you without needing to install any extra fuses or relays on the vehicle. The "with tow pacakge" selection on our site, refers to having the factory harness behind center of the rear bumper, like you mentioned having. According to my contact at Curt, this is present on all 2020 GMC Terrains, which is why they...
    view full answer...
  • Recommended Trailer Hitch for a 2020 GMC Terrain
    The trailer hitch that I recommend for a 2020 GMC Terrain is the Draw-Tite Max-Frame Trailer Hitch Receiver part # 76419 because it has a hidden design which means you won't see the bulky, unsightly cross tube from the rear of the vehicle so you won't take away from its aesthetics. I have attached a photo of this clean look for you as well. In addition to aesthetics, the hidden design makes for the best ground clearance. If you will be towing a trailer then you'll also need a trailer...
    view full answer...
    Image 1 for
  • Trailer Hitch Recommendation for 2020 GMC Terrain
    You have chosen wisely because I highly recommend the Draw-Tite Trailer Hitch # 76419 for your 2020 GMC Terrain (non-diesel). The reason this is the best hitch for you is because it has the highest capacities at 4,500 lbs towing and 675 lbs tongue weight, which speaks to it's strength and durability, and because it is the only hitch rated for use with a weight distribution system, which is something people use regularly when towing. To add trailer wiring to power your trailer lights...
    view full answer...
  • Curt or Draw-Tite Class II Trailer Hitch for 2020 GMC Terrain
    Between the Curt Trailer Hitch Receiver # C98CR and Draw-Tite Trailer Hitch Receiver # 36642 that fit your 2020 GMC Terrain, I would go with the Curt Trailer Hitch Receiver # C98CR These are very similar hitches, but the deciding factor here is that the Curt does have the significantly higher tongue weight capacity, 525 lbs vs. 350 lbs for the Draw-Tite. While this may not come into play often, it certainly can make a difference if you need to carry heavier cargo on a cargo carrier,...
    view full answer...
  • Does Hitch Install on 2019 GMC Terrain Require Dropping Exhaust
    The exhaust of your 2019 GMC Terrain does not need to be lowered to install the etrailer.com hitch part # e98904 that you referenced. While we don't have a hitch for your vehicle that has a 4-way mounting bracket we do have other solutions like the 4-way bracket # 18140 and # 18144. This will wrap around the hitch tube and give you a bracket like you are wanting. For a 4-way then you'd want the part # 118764 which is a custom fit kit for your 2019 GMC Terrain. If you wanted to do...
    view full answer...
  • No Relays Found When Installing T-One Wiring for Factory Tow Package on 2019 GMC Terrain
    The T-One Vehicle Wiring Harness # 118285 that you referenced is supposed to be used if your 2019 GMC Terrain came with the factory tow package. If those fuse locations are empty then it sounds like you don't have the factory tow package and you need the T-One Vehicle Wiring Harness # 118764 instead which tees in behind your tail lights and doesn't require any relays. If your Terrain is supposed to have the tow package then you should have metal contacts where those relays install. Since...
    view full answer...
  • Troubleshooting T-One That Works Only on LED Light Trailer but Not with Incandescent Light Trailer
    Ralph, It sounds like the T-One Vehicle Wiring Harness for Factory Tow Package # 118285 is what you should be using for your 2019 GMC Terrain as it's designed for vehicles with a factory tow package. The # 118764, you mentioned, is designed for vehicles that do not have a factory tow package. LED lights draw only a fraction of the amperage when compared to incandescent lights, so what is very likely happening here is that you're dealing with a case of an insufficient or poor ground....
    view full answer...
  • Comparing the T-One Vehicle Wiring Harnesses for a 2018 GMC Terrain
    There are two types of trailer wiring harnesses for a 2018 GMC Terrain, the T-One Vehicle Wiring Harness part # 118285 which is for models with the factory tow package or the T-One Vehicle Wiring Harness part # 118764 which is for models without the factory tow package. It sounds like you have the one for models with the factory tow package but cannot find the factory plug so if that is the case then you will indeed need the other harness. I have attached a photo for you of the factory...
    view full answer...
    Image 1 for
  • What is the Towing Capacity of a 2018 GMC Terrain
    According to the owner's manual for your 2018 GMC Terrain, if the trailer does not have brakes then you can only tow up to 1,000 lbs but if the trailer does have brakes then you can tow up to following based on engine size: 1.5L Gas Engine with Front Wheel Drive (FWD) - 1,500 lbs. 1.5L Gas Engine with All Wheel Drive (AWD) - 1,500 lbs. 1.6L Diesel Engine or 2.0L Gas Engine - 1,500 lbs. 2.0L Gas Engine with V92 Trailering Provisions (Tow Package) - 3,505 lbs. The Draw-Tite Max-Frame...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video by:
Jacob T
Employee Cole B
Installed by:
Cole B
Employee Chris R
Video Edited:
Chris R
Employee Sarah W
Updated by:
Sarah W
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
Updated by:
Isabelle B
Employee Ronnie R
Written by:
Ronnie R
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F

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