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 # 118559
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Custom Fit Vehicle Wiring

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Tekonsha Trailer Hitch Wiring - 118559
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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 118559 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 (1)
  • Q & A (4)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118559

  • 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 behind tail lights
    • 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 the 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 light: 2.1 amps per circuit
    • Tail lights: 5.6 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 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 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.

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.

118559 Tow Ready T-One Vehicle Wiring Harness

Installation Details 118559 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 - 118559

Average Customer Rating:  5.0 out of 5 stars   (1 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.

- 118559
2012 Hyundai Accent

Connecting the harness to the tail lights on either side was easy and uneventful. My 2012 Hyundai Accent 4-door doesn't have any grommets that feed wires to the underside of car so it was necessary to drill a hole. I drilled a hole from under the car into the truck, from just behind the rear axle, soI knew I wouldn't damage anything. I bought and used a rubber grommet to line the hole to protect the wire running from the control box in the trunk to the battery. The wire leaves the truck near the drivers side rear brake assembly and I zip tied the power wire to the brake lines. The brake lines run from rear to front through a channel inset into the bottom of the car to keep them away from damage. There are a couple of plastic shields over the brake lines for added protection and I was able to lift one side of the shields to push the wire into the shields. When I got to the engine compartment I inserted a metal rod from the brake fluid module to the underside of the car and taped the end of the wire to the rod and pulled it up, cut the wire to length, inserted the fuse module, and connected it to the battery. Works perfectly. 649405

After a year it still works properly every time. Very pleased.
Barrie - 05/28/2020


Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Can a 2014 Hyundai Accent Tow a Trailer?
    The Draw-Tite Sportframe Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4" # 24884 is a fit for your 2014 Hyundai Accent. You are correct that cars aren't really designed for heavy hauling, so you do need to stay within the capacities of your owner's manual and the products themselves. The 3 bolts you referenced are grade 5 and will secure the hitch at the rated capacities without issue. This hitch is rated for 200 lbs tongue weight and up to 2,000 lbs towing but the manufacturer...
    view full answer...
  • Trailer Hitch with No Bumper Trimming and Wiring for a 2015 Ford Edge Sport
    When installing Curt trailer hitch # C13234 on a 2015 Ford Edge Sport there is an under body panel, not the fascia or bumper, that will need to be either trimmed or removed so the hitch can install. I have included a picture showing where the panel gets trimmed. I have also included a link to the installation instructions for you to view. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop...
    view full answer...
  • Parts Needed to Tow Small Trailer with 2013 Hyundai Accent Sedan
    Our most popular hitch for your 2013 Hyundai Accent sedan is the Draw-Tite Sportframe Trailer Hitch # 24884. The manufacturer's gross trailer weight rating for this hitch is 2,000 lbs and the gross tongue weight rating is 200 lbs. I have sent you a link to the installation details that you can check out. You will also need the following products to complete your towing setup: Ball Mount # 3592 Pin and Clip # PC2 2 inch Hitch ball # 19258 Trailer Wiring Harness # 118559
    view full answer...
  • Recommended Trailer Hitch and Wiring for a 2012 Hyundai Accent GLS
    Draw-Tite trailer hitch # 24884 mounts to your 2012 Hyundai Accent GLS in three places. One bolt on each side and another in the center that attaches to the tie down hook that is already present on the vehicle. I have included a link to the installation instructions to the right for you to view. If you will be using this hitch for a bike rack or cargo carrier, make sure that the accessory is compatible with a Class I hitch. For a bike rack you will also be limited to carrying 2 bikes...
    view full answer...

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