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  5. 4 Flat
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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118684
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Tekonsha Trailer Hitch Wiring - 118684
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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 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118684 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 (4)
  • Q & A (10)
  • Videos (1)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118684

  • 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.


  • 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
    • Connect hot lead to power cable stud
  • Includes ModuLite power converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 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 inside your rear cargo area, behind the tail lights on both the driver's side and passenger's side. 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 to the power cable stud on the driver's side and connect the wire using the ring terminal. Then insert the included 15-amp fuse into the fuse holder.

Once installation is complete, the 4-way 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.

118684 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included

Installation Details 118684 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 - 118684 Review

Today we're going to be taking a look at a T1 Vehicle Wiring Harness with a 4-pole Flat Trailer Connector. This products fits certain years of the Honda Accord. It's going to provide your 4-way Flat Connector at the back of your vehicle to power your trailer's signal lights. Now this connector is compatible with 5-pole, 6-pole, and 7-pole adapters, adapters are sold separately, and it's going to come with dust cap for the 4-way Flat Plug, that way you can cover up the connection points when the plug's not being used. The black box right here, this is going to be the included Modulite Power Converter. This is going to insure your vehicles wiring matches that of your trailer's. The power module's going to connect directly to the vehicle battery through the wiring, and that's going to avoid overloading the vehicle's electrical system. Now, the unit is designed to connect quickly and easily. It's going to come with your detailed installation instructions to help walk you through the installation process step-by-step, but basically what you'll need to do is locate your connection points in your rear cargo area. Then you're going to have all these connectors.

So you're going to have one connected to the brown wire, yellow wire, red and white wire, and then a green and white wire. What you'll want to do is you'll want to get all those connected to the appropriate places, found in the included instructions. Now, this is a custom fit vehicle wiring harness, so the plugs are going to match up perfectly with the ports on the vehicle. They're going to snap-lock together for a nice, tight, secure fit. Once you have all your connectors plugged in, you're going to need to make a ground connection. That's going to be your white wire with the ring-terminal attached to it. You want to get that grounded in a nice clean, metal surface with the included grounding screw. Then you'll need to mount your Converter Box.

That's going to be this black box right here, and you can do that with the included double-sided adhesive tape. You just want to make sure you get your box mounted to a nice, clean, out of the way location. Then you'll need to run your hot lead to the vehicle battery. The hot lead is going to be the short, black wire coming out of the box. This is going to get connected to the bundle of black wire with one of the included butt-connectors. The other end of the black wire runs to the vehicle battery, gets another butt-connector attached to it, then it's going to connect to one-half of the included fuse-holder. The other half of the fuse-holder gets a ring terminal attached to it, and that's going get connected to the positive post on the vehicle battery.

It's also going to include your 15-AMP fuse, it goes right here in the fuse-holder, and it's got the cap on there to keep the fuse safe and protected. Once you have that connected, you can use the included zip-ties to secure any excess or slack in the wiring, making sure your wires are safe, up and out of the way. Once your install is complete, the 4-way connector's going to be sewed in your rear-cargo area. It's going to be recommended that you use a small amount of dielectric grease on all of your electrical connections, like the plugs on the vehicle and the 4-pole connector itself. That grease is going to help prevent corrosion to the connection points. If you need some of that, you can find it right here at etrailer.com, it is sold separately. When it comes to your 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. That's going to do it for today's look at the T1 Vehicle Wiring Harness with the 4-pole Flat Trailer Connector.

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118684

Average Customer Rating:  4.8 out of 5 stars   (4 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.

- 118684

Product came as described and works as described. Good quality components used in the construction. 660455

- 118684
2016 Honda Accord

Part number 118684 worked great on my 2016 Accord Sport. Plug and play. Nicholas was a wonderful support from the company. I will be using E-trailer again and keep his number for the future. I only wish that shipping was included in the list price being it was so inexpensive to ship. 492805

- 118684

The instructions were good and it worke d. 473105

- 118684
2016 Honda Accord

This was a very easy installation into my 2016 Honda Accord. One minor difference from the kit, I really didn't need to drill a hole for the ground wire since there was an existing ground right next to my tail light. I just used that one. And the routing of the power wire under the car took a bit of care making sure it stayed away from heat shields and moving parts. It helped to have the back end of the car up on ramps. Everything in the kit fit perfectly and I used a video of a 2015 installation as reference: [link] Thanks again to eTrailer who once again delivers good products, customer service, and instructions. 332792


Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Trailer Wiring Harness Recommendation for 2017 Honda Accord Sedan
    Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Even if those circuits are LED which do not draw that much relative to incandescent. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. For your 2017 Honda Accord you need to install a harness that...
    view full answer...
  • Is there a T-One Wiring Harness without a Powered Converter Available for 2017 Honda Accord
    For your 2017 Honda Accord Sedan a powered converter (the wire that needs to run to the front of your car to attach to the battery) is required for a vehicle wiring harness to work properly. This is simply because the rear taillights do not by themselves generate the necessary power to run to the back of the trailer and also provide power to the trailer's rear lights. For many cars, including the 2017 Honda Accord, power must instead be generated from the car's battery. This method of wiring...
    view full answer...
  • Why is Powered 4-Pole Trailer Wiring Harness Necessary on 2016 Honda Accord with LED Lights
    Some vehicles need a powered trailer wiring harness with a separate power wire (rather than the passive type that just plug-in) in order to protect the car's wiring. In the case of the 2016 Honda Accord sedan this is the type of harness required, either Curt # C56299 that you referenced or the similar Tekonsha # 118684. Both harnesses install in an identical manner and differ only in terms of their maximum current output capacity. The Tekonsha harness offers higher output (4.2-amps per...
    view full answer...
  • Everything Needed to Tow With 2016 Honda Accord
    I took a look at the owner's manual for a 2016 Honda Accord and though you will be able to tow a trailer, please keep in mind that the maximum your Accord can tow is 1,000 lbs. To do so you would need to start with a trailer hitch, and I recommend the Draw-Tite # 24899 which has a 1-1/4" receiver and is a bolt-on installation so there will be no drilling into your Accord's frame; I have linked a video showing an install of this hitch on a '16 Accord for you to take a look at. In...
    view full answer...
  • Recommended Trailer Hitch for 2016 Honda Accord Sport
    For the 2016 Honda Accord Sport 4-door sedan we do offer 1-1/4-inch Class I hitches from both Curt and Draw-Tite. Both hitches are quality items and their installation is the same since they mount in the exact same spot on the car's frame. But the one I suggest is the Draw-Tite # 24899 because it does not have the requirement to use a stabilizing strap # 18050 as the Curt does, for loads like bike racks and cargo carriers. If you plan to tow you'll also need a ball mount, hitch ball...
    view full answer...
  • Recommended Trailer Wiring Harness For 2017 Honda Accord Coupe
    The trailer wiring harness you asked about, part # 118684, is designed to fit the Honda Sedan only and is not a fit for your Coupe. I do have a harness that will work for you. I recommend the Upgraded Modulite Vehicle Wiring Harness Kit with 4 Pole Trailer Connector, part # 119147KIT. The installation of this kit does require hard-wiring. The kit comes with a circuit tester that helps identify the wires located behind the vehicle tail lights. This harness works with incandescent or LED...
    view full answer...
  • Recommendations for Towing Using a 2017 Honda Accord Hybrid
    Neither Curt nor Draw-Tite confirm a fit for your 2017 Honda Accord Hybrid, but we have had a customer install one on a hybrid. His review can be found on the page for the Curt Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4" # C11681. It did require a little more modification of the underbody panels. For your trailer wiring, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118684 which will work with the LED lights. This custom-fit T-One connector...
    view full answer...
  • Recommendations For Carrying 4 Bikes With 2017 Honda Accord With Class l Trailer Hitch
    The trailer hitches we offer for a 2017 Accord are Class l trailer hitches only carry two bikes. I recommend a couple ways to approach the problem with carrying 4 bicycles. You can use a hitch adapter like part # HTAD and carry two bikes in the carrier. using any adapters in the hitch will reduce the capacity of the hitch by 50 percent. You can then get a roof rack and bike carriers for the roof of your Accord. If you have no side rails or crossbars on the roof I recommend the Rhino-Rack...
    view full answer...
  • Trailer Hitch and Wiring for a 2017 Honda Accord
    For your 2017 Honda Accord you can use Curt hitch # C11681 with the recommended ball mount # C45521. For a 1-7/8 inch ball use # 19257 and for a 2 inch use # 19258. Then for a pin and clip use # F-4. And for trailer wiring you can use # 118684 to add a 4-Way flat connector to the rear of the vehicle.
    view full answer...
  • Trailer Hitch and Wiring for a 2017 Honda Accord Hybrid
    Curt shows trailer hitch # C11681 as a fit for all models of the 2017 Honda Accord so that would include your hybrid model. For trailer wiring you can use # 118684 as long as you do not have the Touring model. There isn't a wiring harness for Touring models. the recommended ball mount for the hitch is # C45521. For a compatible ball you can use # A-80 for a 1-7/8 inch or # A-82 for a 2 inch.
    view full answer...

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Info for this part was:

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

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