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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 7 Round - Blade
  6. No Converter
Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector

Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector

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Custom Fit Vehicle Wiring

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Replace the damaged 7-way, RV-style trailer connector on your vehicle with this T-One harness. ModuLite reduces strain on wiring system. Brake controller adapter plugs in beneath your dash and lets you easily plug in your electric brake controller. Call 800-298-1624 to order Tekonsha custom fit vehicle wiring part number TK87FR or order online at Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (4)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring

  • Custom Fit
  • Trailer Hitch Wiring
  • 7 Round - Blade
  • No Converter
  • Tekonsha

Replace the damaged 7-way, RV-style trailer connector on your vehicle with this T-One harness. ModuLite reduces strain on wiring system. Brake controller adapter plugs in beneath your dash and lets you easily plug in your electric brake controller.


  • Towing prep kit replaces damaged factory 7-way, blade-style trailer connector at the back of your vehicle
    • Enables your truck to power your trailer's signal lights
    • Compatible with 4-pole, 5-pole, and 6-pole adapters (sold separately)
  • T-One connects quickly and easily
    • Plug into connection points behind tail lights
    • Run body harness up to car battery
  • Included tail light converter ensures that your vehicle's wiring matches that of your trailer
  • Wiring adapter eases installation of your electric brake controller
    • Custom connector end plugs into the built-in port beneath the dash of your vehicle
    • Other end plugs into the back of your electric brake controller
      • Compatible time-delayed brake controllers: Draw-Tite Activator I (5100), Draw-Tite Activator II (5500), Draw-Tite Activator III (5520) and Tekonsha PowerTrac (39523)
      • Compatible proportional brake controllers: Tekonsha Prodigy (90185), Tekonsha P2 (90885), Tekonsha P3 (90195), Tekonsha Primus IQ (TK90160) and Tekonsha Voyager (39510)


  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty

Installation of Tekonsha T-One Connector

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 and some interior paneling to access this harness. Once you've plugged in the T-connector, run the body harness up to your car battery and connect the wires per the included instructions.

T-One Connection Location Points Behind Tail Lights

Once installation is complete, the 7-way 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 7-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 2-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's 3-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.

Installation of Tekonsha Brake Controller Adapter

This adapter plugs into the 4-pin connector on your vehicle's built-in brake control wiring harness. The harness is located underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal.

This adapter requires no hardwiring. It is designed to plug directly into your electric brake controller for the simplest installation possible. Because there are no wires to connect, installation is not permanent. You can unplug and remove your brake controller at any time and securely stow it away.

22118 Tekonsha Replacement Harness with Brake Control Adapter for Factory Tow Package - 7 Pole - Modu-Lite

Item # TK87FR

Installation Details TK87FR Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector - TK87FR

Average Customer Rating:  5.0 out of 5 stars   (4 Customer Reviews)

Replace the damaged 7-way, RV-style trailer connector on your vehicle with this T-One harness. ModuLite reduces strain on wiring system. Brake controller adapter plugs in beneath your dash and lets you easily plug in your electric brake controller.

- TK87FR
Toyota Sienna

Everything was included that I needed to add trailer and brake wiring to my Toyota Sienna. Overall quality was good, no issues with the installation.

- TK87FR
2018 Toyota Sienna

Had it installed in record time then looked at the instructions showing the double connector on the opposite colored wires than the physical wire. Pulled it all out and put it on the opposite side. 6 hours later my signals are opposite the trailer lights. Note have to cut and splice left and right signals or switch pins at plug end.

- TK87FR

This is fairly involved and it made sense for us to use Uhaul(TM) to install it for just a few Ben Franklins.

- TK87FR

Very Happy / Worked Great!


Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Troubleshooting The Installation Of A Tekonsha Brake Controller Adapater For 2017 Toyota Sienna
    The blue wire in your Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector, part # TK87FR, is for the reverse lights on your trailer. A 4-way connector has wires for the brake lights, turn signals, running lights, and a ground, so the reverse lights do not turn activate on your trailer. Keep in mind, if you have a trailer that does not have reverse lights, this is not an issue. It becomes an issue if you are towing a trailer that has reverse...
    view full answer...
  • Does the Tekonsha 7-Way OEM Vehicle Wiring Harness for 2020 Toyota Sienna Come with Brake Controller
    The Tekonsha OEM Replacement Vehicle Wiring Harness part # TK87FR which is a fit for a 2020 Toyota Sienna does not come with a trailer brake controller but it has everything you need for one. It will plug directly into any Tekonsha trailer brake controller like the Tekonsha Primus IQ Trailer Brake Controller part # TK90160 which is what I recommend.
    view full answer...
  • 1-1/4 inch Trailer Hitch for 2019 Toyota Sienna
    While we don't have any Class I hitches that fit your 2019 Toyota Sienna we do have Class II hitches which are the same 1-1/4 inch hitch size like with the Draw Tite # 36513. This essentially would function exactly the same as a Class I and would be the same size but would just have more weight capacity than you'd need. Then for trailer wiring you'd just need the part # 118648 which I attached an install video link for on this page as well as an install video for the hitch.
    view full answer...
  • Recommended Trailer Hitch, Wiring, Brake Controller & Air Springs For 2019 Toyota Sienna Limited
    Absolutely happy to do so, and let's start with the suspension support, and the best option for your 2019 Toyota Sienna is definitely the Air Lift 1000 Air Helper Springs for Coil Springs # AL60732. These install inside your Sienna's coil springs to act as support for your OEM springs when you inflate them, absorbing shock and adding stability to your ride for better handling. As far as the hitch, wiring, and brake controller, you do have the correct fit for the hitch and wiring, and...
    view full answer...
  • How To Add Both 4 and 7-Way Trailer Connection Points On a 2020 Toyota Sienna
    The Tekonsha OEM Replacement Vehicle Wiring Harness part # TK87FR is the only plug-in 7-way trailer wiring harness for a 2020 Toyota Sienna so this is what I recommend. It has a 7-way only but you can switch out the plug to the Hopkins Endurance Multi-Tow part # HM40950 for both 4 and 7-way. Don't forget the Mounting Bracket and Installation Hardware part # PK12711U so you can secure it.
    view full answer...
  • 2018 Toyota Sienna SE 7 Pole Trailer Wiring
    You have a couple options for your 2018 Toyota Sienna SE, the one that I recommend is getting the Hopkins wiring kit # HM11143495 because it will work with the SE SUB model Sienna. The kit you were looking at # TK87FR is not supported by the SE model. Yes, the Hopkins kit is just a 4 pole connector, but your can get an adapter like # 30717 you will be ready to haul! If you wanted to go the universal route, get the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way...
    view full answer...
  • Trailer Hitch, Wiring, & Hidden Brake Controller For 2016 Toyota Sienna XLE
    We can get your 2016 Toyota Sienna XLE set up with what you need for the hitch, wiring, and brake controller. It can definitely be a bit overwhelming so it's a good idea just to verify, and you made a really nice choice with the Draw-Tite Max-Frame Trailer Hitch Receiver # 76112. This has a concealed design so it looks nice and also sits up higher for better ground clearance. As for the wiring, you are off to a good start with the 4-way that you have, the Curt T-Connector Vehicle Wiring...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Written by:
Alexander C

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