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  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 # 118787
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118787 - 4 Flat - 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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118787 or order online at 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.
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  • Reviews (2)
  • Q & A (0)
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Tekonsha Custom Fit Vehicle Wiring - 118787

  • 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.


  • 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


  • Maximum amperage:
    • Stop/turn lights: 5 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 the vehicle's rear cargo area. You will have to remove the cargo hook on both sides, partially removing the plastic threshold cover, side panels, and cargo trays 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 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.

118787 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118787 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 - 118787

Average Customer Rating:  5.0 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.

2019 Volkswagen Golf

Plug and Play installation on a 2019 Golf R. I used the rear power outlet as a power supply with the fuse inline. As my bicycle rack has LED lights the Amperage draw should be very low.



Perfect no issues
Chuck - 06/14/2021

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Trailer Wiring Recommendation for 2018 Volkswagen Golf
    For your 2018 Volkswagen Golf the best trailer wiring option we have is the T-One kit part # 118646 for the non-R models or part # 118787 for if you do have the R model. The T-One brand of trailer wiring harnesses is our most reliable option we offer so we recommend it the highest.
    view full answer...
  • What Hitch do you Recommend for my 2020 VW Golf R Model
    The Draw-Tite Sportframe Trailer Hitch Receiver part # 24975 is a confirmed fit for your Golf R and will give you an 1 1/4" receiver tube opening. This can be used with many different hitch mounted accessories as it is a very common size among hitches. This will have a 200 lb. tongue weight rating and a 2000 lb. gross trailer weight rating but of course don't exceed what VW recommends in the owners manual. If you plan on hauling a small trailer or a lighted cargo carrier I recommend the...
    view full answer...
  • How To Find Correct Trailer Wiring Harness for 2019 VW Golf
    There are multiple trailer wiring harness options for a 2019 Volkswagen Golf because there are so many different trim levels; GTI, Alltrack, R, Sportwagen, etc. In order for us to confirm fit we will need to know which exact one you have. The Tekonsha T-One part # 118646 fits most models but there are ones it does not fit such as the R and in which case you would use the Tekonsha T-One part # 118787. If you're looking for a universal one that fits all models then you can use the Upgraded...
    view full answer...
  • EcoHitch Stealth Trailer Hitch Receiver for 2018 Volkswagen Golf R
    The EcoHitch Stealth Trailer Hitch Receiver, # 306-X7375 is for GTI models. The EcoHitch, # 306-X7332 is for the R models. This has a 2" x 2" receiver opening with a maximum gross trailer weight of 2,000 lbs. and max tongue weight of 300 lbs. If you will be using for light towing, I suggest the T-One Vehicle Wiring Harness, # 118787. The T-One connector plugs directly into existing wiring without need to cut or splice providing a 4-way flat trailer connector. We have option a ball mount...
    view full answer...
  • Wiring Harness and Hitch Recommendation for 2019 Volkswagen Golf GTI Rabbit
    We do have a 4-pole flat trailer connector for the 2019 Volkswagen Golf GTI Rabbit but the part # 118787 does not fit. The wiring harness you need is Curt 4-pole flat part # C56405. We installed the Curt wiring harness on a 2018 Volkswagen Golf GTI. Since the 2019 GTI Rabbit is just a trim package upgrade, the wiring harness fits the same. I have attached a video for your reference. If you need a hitch for the Rabbit, I recommend EcoHitch part # 306-X7375. The EcoHitch's cross tube is...
    view full answer...
  • What is the Height From Ground to the Top of Drawbar on 2018 VW Golf GTI?
    The Draw-Tite Sportframe Trailer Hitch Receiver # 24979 will have a height of approximately 13" to the inside top of the receiver tube on your 2018 VW Golf GTI. The center of the bolt hole will sit approximately 4" from the outermost point of the rear bumper. The T-One Vehicle Wiring Harness # 118787 is only confirmed to fit the Golf R Models. For your GTI you will need the Curt T-Connector Vehicle Wiring Harness # C56405 for a 4-way flat connector. The EcoHitch Hidden Trailer Hitch...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
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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