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 # 118680
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118680 - Custom Fit - Tekonsha
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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. Powered ModuLite reduces strain on wiring system. Call 800-298-1624 to order Tekonsha custom fit vehicle wiring part number 118680 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 (36283)
  • Q & A (4)
  • Videos (1)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118680

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered 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. 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 connector - no cutting or splicing
    • Run hot lead to car battery
  • Includes a tail light converter 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
  • Protective connection terminals resist corrosion
  • Comes with dust cap for 4-way flat connector, cable ties, and terminal grease packet for electrical connections


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-connector plugs into your vehicle's wiring harness, which is located in your rear cargo area on the driver's side and passenger's side. You may have to remove the rear threshold and interior paneling to access this harness. Once you've plugged in the connector, run the hot lead up to your car battery. Connect the included fuse holder, and then connect the fuse holder to the positive terminal on your battery.


Once installation is complete, the 4-way 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.


Powered Tail Light Converter

A tail light converter is built into this T-connector. This converter is a battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.


Because most trailer 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 the trailer. This 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.



118680 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118680 Installation instructions

This Product Fits The Following Vehicles



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 - 118680 Review

Today we're going to be taking a look at the T1 vehicle wiring harness with a four-pole flat trailer connector. This product is going to fit certain years of the Toyota Prius C. What you can do is you can use the vehicle fit guide located on our website to see if this is a fit for your particular vehicle. This unit's going to provide a four-way flat trailer connector at the back of your vehicle to power your trailer's signal lights. This is compatible with five pole, six-pole, and seven-pole adapters. Adapters are sold separately, and it's going to come with a dust cap for your four-way flat connector, that way you can cover up the connection points when your plug's not being used. The black box on the unit, this is going to be the included tail light converter.

This is going to ensure that your vehicle's wiring matches that of your trailer's. The power module's going to connect directly to the vehicle battery through the wiring to avoid overloading your vehicle's electrical system. One of the main benefits of the system, besides providing your four-way flat trailer connector, is how easily and quickly it's going to install. All you have to do is locate the connection points in the rear cargo area, and you're going to have two sets of connectors, one for each side of the vehicle. It's going to come with detailed installation instructions. Those are going to indicate exactly where those location points are, and it's going to walk you through the installation process step by step. Locate the connection points, plug in your connectors, there's no cutting or splicing required.

Once you have those connected, you'll need to make your ground connection. That's going to be the white wire with the ring terminal attached to it. You want to get that grounded in a nice clean metal location, a metal surface with the included grounding screw. Really quick, another thing about the connectors is that this is a custom fit wiring harness, so these plugs are going to match up perfectly with the ports in your vehicle and they're going to snap lock together for a nice, tight, secure fit. Once you have those plugged in, once you make your ground connection, then you can mount your converter box. It's going to come with some double-sided adhesive tape.

You want to get that mounted in a nice, clean, out of the way location, and then you're going to need to run your hot lead to the vehicle battery. Hot lead's going to be the black wire coming out of the converter box. It's going to get connected to the bundle of black wire with one of the included buck connectors. The other end of the black wire runs to the vehicle battery, gets another buck connector attached to it, and then connects to one half of the fuse holder. The other half of the fuse holder gets a ring terminal attached to it, and that's going to connect to the positive posts on the vehicle battery.

It's going to come with a 15 amp fuse, goes directly in the fuse holder and it's got the cap to keep it safe and secure. Once you have all that done, you can go ahead and secure any excess or slack in the wiring with the included zip ties, and then once the installation is complete, the four-way connectors are going to be stowed in an out of the way location within your cargo area. When it comes to the maximum amperage for the stop and turn lights, we're looking at 4.2 amps per circuit, and for the tail lights we're looking at 7.5 amps per circuit. It's also recommended that you use a small amount of dielectric grease in all your electrical connections, like the plugs on the vehicle and the four-pole connector itself, and that's really going to help prevent corrosion from affecting those connection points. That's going to do it for today's look at the T1 vehicle wiring harness with the four-pole flat trailer connector.


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118680

Average Customer Rating:  4.8 out of 5 stars   (36228 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.

- 118680
by:

Since I had separate brake lights and turn signals on my car I had to have some way to combine these for the lights on the trailer. This did the trick and it was fairly easy to install.



- 118680
by:

Easy to connect and attach to my wiring harness; works great.



- 118680
by:

Great hitch and wiring. Fast service. Sold car with it now in inventory. Yours for a call tag! Used once to tow 300 lbs. Of wood.



- 118680
by:
2012 Toyota Prius

I had some initial trouble getting the right harness...could have been me misreading the description. Anyway, I got the correct harness and installed it. The installation instructions were a little sketchy - getting access to the 12 volt Prius C battery was a chore, but I was able to do it. Not much help online for this, I might add. I had to lengthen the power lead and ground lead - how much would it cost to add a foot or so to each? Also, I had trouble finding a suitable place to mount the box - wasted the sticky-back patch and had to end up using contact cement. My biggest problem was not with the etrailer stuff, but the durned trim panel clips. I had to order more, since the original ones were sprung and wouldn't go back into the hole. As far as etrailer is concerned, I would go back again.



- 118680
by:
2014 Toyota Prius c

With the video(s) to help - this is a great and easy way to install the wiring. Thanks so much


Comments
Excellent!
Daniel - 06/11/2019



- 118680
by:

Watching video was very helpful. The jumper wire from the module to the battery fuse link is not long enough, had to go purchase extra wire. Check it before you get started. Other than that, very easy to install.



- 118680
by:
2014 Toyota Prius c

My hitch has performed flawlessly. The installation kit fit without any modification. I am so happy with my hitch.



- 118680
by:
2015 Toyota Prius c

Wiring went great, a little confusing on the power cord, but all went well. Pulling a max 2,000 pound load!!! Coming soon!!! Videos and pics



- 118680
by:
2013 Toyota Prius c

Great install video oline made this a no brainer.



- 118680
by:

Thank you! Was easy to install, works great! Sal was very helpful when choosing the correct tow package.



- 118680
by:

Great product, quick delivery, excellent follow up!



- 118680
by:

Great product, quick delivery, excellent follow up!



- 118680
by:
2013 Toyota Prius c

Saved me [price] dollars that [competitive retailer] would have charged me. Thanks!



- 118245
by:

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


Plug and play. Hitch was placed on a board and jacked up to meet the bolt holes. Remounted the two tow hooks. Not a lot of extra threads but they all fit perfectly. Glad I had an impact. Wiring had to remove protective cap and plugged in. 4 runner already had a fuse in the box. Bought the 4 flat plug mount but drilling up into hitch proved to be to much so just used a good hose clamp to secure the plug. Also more adjustable wire length if needed.



- 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


- 118265
by:

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


This kit is very easy to install on my 2012 Honda Pilot EX-L and came with almost everything needed to install it. It was only missing 4 screws to secure the 7 pin plug onto vehicle’s the plastic trim but any type of small screws or bolts would work. Definitely recommended to anyone who’s looking to install a 7 pin trailer harness.



- 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


- 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


- 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.



- 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.



- 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


- 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


- 118252
by:

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


FITS the new 2020 HIGHLANDER! There is a new connector with the 2020 Highlander redesign under the driver side rear bumper. This cable plugs directly into the Highlander connector. See photo. There is no need to route or run wires for the trailer wiring. You will also need a converter to provide the correct signals to this cable. I recommend using the Toyota Plug-n-play converter part number: PT725-48200. It’s around $60 online. Be aware it is installed behind a panel located next to the driver’s side second row seat. Toyota completely changed the vehicle wiring for the 2020 model year. I also recommend the CURT C99FR hitch. Fits perfectly, easy to install and hides behind the bumper.


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Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Trailer Wiring Harness Recommendation for 2016 Toyota Prius c
    For a custom fit trailer wiring harness confirmed as a fit for your 2016 Toyota Prius c the Tekonsha kit part # 118680 would be what you would want. The Tekonsha harnesses are the most reliable from our experiences.
    view full answer...
  • Trailer Wiring Install Harness for 2013 Toyota Prius c that Has Long Enough Harness
    We had a chance to install the Curt trailer wiring harness part # C56275 on a 2014 Toyota Prius c just like yours and we found that all of the wiring of the kit was the correct length. See the attached install video for more info and to see the install process walked through. That said, we have not had anyone come back and tell us that the # 118680 didn't fit their Prius either so the install video would help to see with the harness you have now as well.
    view full answer...
  • Recommended Trailer Hitch for 2014 Toyota Prius C
    To a tow a trailer with your 2014 Toyota Prius C you're going to need a trailer htich. I recommend the Draw-Tite Sportframe Class I Trailer Hitch Receiver # 24971. This hitch has a 2,000 pound maximum towing weight can requires no drilling to install. To power your trailer's lights you'll need a wiring harness. The Tekonsha T-One Wiring Harness # 118680 will give you a 4-way connector on the rear of the Prius. There's no need to cut any wires, this harness plugs right into your car's...
    view full answer...
  • Parts Needed to Tow Small Trailer With 2014 Toyota Prius C
    We do have everything you need for your 2014 Toyota Prius c to tow a small trailer, which is a hitch, wiring harness, ball mount, and hitch ball. I'll make a list for you of all the parts: - Draw-Tite Trailer Hitch Receiver # 24971 - T-One Vehicle Wiring Harness # 118680 - Draw-Tite Drawbar # 3593 - 1-7/8" Hitch Ball # 19256 or 2" Hitch Ball # 19258 The hitch ball size will depend on the size of your trailer's coupler, but it will likely be 1-7/8" since it is a small trailer. The...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Alexander C
Written by:
Alexander C

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