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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

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Custom Fit Vehicle Wiring

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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 TK99VR 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.
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  • Reviews (15)
  • Q & A (0)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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 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 battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

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 protective covers next to each tail light 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 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 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.



118849 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Item # TK99VR

Installation Details TK99VR Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - TK99VR

Average Customer Rating:  4.7 out of 5 stars   (15 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.

by:
2021 Ford Bronco

the etrailer website said this was the only harness that they could validate to fit the 2021 bronco so I bought it, installed it and it didnt work. So I checked around on line and budget bronco on youtube installed the curt verson of this unit and determined it only works with led taillights.The majority of broncos are halogen,as is mine so I called etrailer( 2021 and 2022 wiring are the same by the way) they said they could not validate for a 2022 bronco so since it was installed it could not be returned so Im out 116 dollars.Ive talked to several customer service people and this lady was short with me and no help. I've had good exp. with etrailer before and they are my go to for trailer parts but this disapoints.


Comments
I will have our Customer Service team reach out to you. For a 2021 Ford Bronco without LED lights you will need part # 119190KIT
Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit
$111.31
.
-- Etrailer Expert Jenny N - 03/30/2022

by:
2021 Ford Bronco

Arrived on time. Installed easily. I had technical questions. etrailer responded quickly. Great service.



by:
2021 Ford Bronco

Super easy instructions for easy installation. So very proud to say that I did the install myself. Thanks for a great after market product.



by:
2021 Ford Bronco

Use this web site to make the kit work on base models (non-led).


Comments
For the 2021 Ford Bronco without LED tail lights you would want to use part # 119190KIT
Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit
$111.31
.
-- Etrailer Expert Jenny N - 03/01/2022

by:

Very well made, good value for the momey



by:

package came packed well.



by:
2021 Ford Bronco

Product was exactly as stated and worked on my Bronco.



by:
2021 Ford Bronco

Fast shipping, won't know until after I get my Bronco and do the install.



by:
2021 Ford Bronco



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by:
2021 Ford Bronco



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15
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Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Troubleshooting Turn Signal Issues with T-One Wiring Installed on a 2021 Ford Bronco
    Since the trailer is working with other vehicles it does sound like the T-One # TK99VR wiring is the issue on your 2021 Ford Bronco. If you use a circuit tester on the 4-Way you can double check and make sure that the 4-Way is working correctly. I would try the connector as well as the wiring before and after the module to ensure that your Bronco is sending the correct signals through. If your Bronco is sending everything correctly (like it should be) then I would think that the wiring...
    view full answer...
  • No Splice Trailer Wiring Harness that Fits 2021 Ford Bronco
    We have trailer wiring harnesses for your 2021 Ford Bronco like the Tekonsha part # TK99VR which do not require splicing. This kit installs by plugging inline with the taillight connectors instead. This option is only for versions with LED taillights though. I attached an install video for more info as well.
    view full answer...
  • Correct T-One Vehicle Wiring Harness for 2022 Ford Bronco
    There are two different tail light bulbs types on a 2022 Ford Bronco, LED and incandescent. If you have LED then you need the T-One Vehicle Wiring Harness part # TK99VR or if you have incandescent then you need the T-One Vehicle Wiring Harness part # TK33VR.
    view full answer...
  • Recommended Hitch for a 2022 Ford Bronco
    The hitch that I recommend for your 2022 Ford Bronco is the Draw-Tite Max-Frame Trailer Hitch Receiver # DT37GR. This hitch has a bolt-on, no-drill installation and will provide you with a 2" hitch receiver which is the most common size used for hitch mounted accessories such as bike racks, cargo carriers and ball mounts. Another nice feature of this hitch is that the receiver sticks a little bit further out, allowing you to use accessories like a bike rack with your spare tire on the back...
    view full answer...
  • Will the Curt Vehicle Wiring Harness Work on 2021 Ford Bronco With LED and Halogen Taillights
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C42WR is designed to fit a 2021 Ford Bronco with LED taillights. This will not work with your LED and Halogen lights. For your 2021 Ford Bronco, I recommend the Tekonsha T-One Vehicle Wiring Harness # TK99VR. We have found Tekonsha to be the most reliable when it comes to a 4-way wiring harness like this. This wiring harness uses the same style t-connector which plugs into your existing wiring for a 4-way...
    view full answer...
  • What Hitch and Wiring Harness is Required to Tow a Light Utility Trailer with My 2021 Ford Bronco?
    For a hitch for your 2021 Ford Bronco, I recommend the Draw-Tite Hitch - 2" # DT37GR. The Curt hitch is compatible with all Bronco models and comes with all mounting hardware required for a bolt-on installation. As far as weight capacity, the hitch has a 675 pound maximum tongue weight and a 4,500 pound gross towing rating. In order to confirm whether your vehicle can accommodate this much weight, I recommend confirming your vehicle's weight capacity with you owner's manual. In addition...
    view full answer...
  • Wiring Harness that is Compatible w/ a 2021 Bronco w/ LED and Halogen Tail Lights
    I have a solution for you but the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # C42WR you referenced isn't designed to work with both the LED and halogen taillights. And neither is the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # TK99VR you were asking about. Both custom wiring harnesses only work with LED's. For a wiring harness that works with halogen bulbs you will want the Upgraded Heavy Duty ModuLite Circuit Protected...
    view full answer...
  • Comparing Curt and Draw-Tite Trailer Hitch Receivers For a 2021 Ford Bronco
    I as well am not an engineer but I can tell you that Draw-Tite has built and tested the Max-Frame Trailer Hitch Receiver # DT37GR strong enough to be able to handle 675lbs of tongue weight and a trailer weight of 4,500lbs. You do want to take into consideration that while the receiver is rated for these numbers you will still not want to exceed the specifications on your 2021 Ford Bronco. If you can't find these in your owners manual the service department at your dealer should be able...
    view full answer...
  • Recommended Trailer Hitch Receiver for 2021 Ford Bronco for Spare Tire Clearance
    In order to get the clearance you need for your bike rack on your 2021 Ford Bronco I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # DT37GR. This Class III hitch has a 2" receiver and bolts onto your rear bumper beam. It has a maximum gross trailer weight of 4,500 lbs and tongue weight of 675 lbs. Make sure to consult your owner's manual so you know what your vehicle is capable of. More than likely the hitch capacity will exceed your vehicle's capacity. Since you will be using...
    view full answer...
  • Best Trailer Wiring Harness For 2021 Ford Bronco
    Great choice with the hitch for your 2021 Ford Bronco with the Draw-Tite # DT37GR, and the best option between the Curt # C42WR and Tekonsha # TK99VR wiring harnesses that fit is absolutely the Tekonsha: - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # TK99VR The # TK99VR is the best option because we have found over time that Tekonsha makes the most reliable trailer wiring harnesses in the industry. This harness also has the higher amp ratings between the two that...
    view full answer...
  • Parts Needed to Install 7-Way and Wireless Brake Controller for 2021 Ford Bronco
    We can definitely help you with a 4-way and 7-way plus brake controller for your 2021 Ford Bronco. You'd first need to install a 4-way like the custom fit part # TK99VR which installs easily and is very reliable. Now for a brake controller I would recommend the wireless Curt Echo Mobile part # C51180 which only needs to plug into an active 7-way and once synced to smart phone is ready to tow with. So then to convert the 4-way to a 7-way you'd just need the # ETBC7L which comes with everything...
    view full answer...
  • Best Trailer Hitch Receiver For 2022 Ford Bronco
    There are a pair of trailer hitch receivers that fit your 2022 Ford Bronco, like you mentioned, and between the Curt and Draw-Tite, the best option is the Draw-Tite, which is the following part number: - Draw-Tite Max-Frame Trailer Hitch Receiver # DT37GR The Draw-Tite # DT37GR is the better option than the Curt # C76WR for a couple reasons, starting with how much longer the receiver is on the Draw-Tite. It gives you three inches of clearance past the bumper, while the Curt is recessed...
    view full answer...
  • Which Trailer Hitch Recommended for 2022 Ford Bronco
    The Curt # C76WR Class III hitch you'd looked at will fit your 2022 Bronco, but I'd recommend the Draw-Tite # DT37GR, instead however because the hitch features a longer receiver tube that would provide more rear clearance for hitch mounted accessories. If you'll be towing with the hitch, you'll also need a trailer wiring harness like # TK99VR, a ball mount like # 2923 and a trailer hitch ball like # 19261 for a 1-7/8 or # 63845 for a 2 inch ball. I've linked to some install videos that...
    view full answer...
  • How to Add 7-Way Wiring on a 2021 Ford Bronco
    To add a 7-Way to your 2021 Ford Bronco you will need a 4-Way kit like the recommended T-One # TK99VR and then the Universal Wiring Kit # ETBC7. The T-One plugs in behind the tail lights of your Bronco and gives you the standard light functions while the ETBC7 comes with everything you need for a fully functional 7-Way. Usually we only see 7-Ways with OEM connections for trucks so your anything smaller than a truck you usually have to install a 4-Way and then an additional kit like what...
    view full answer...
  • What 4-Way and 7-Way Connector do You Recommend for My 2021 Ford Bronco?
    From the sound of your question, it sounds like you are wanting an option for both a 4-way and a 7-way to install into your 2021 Ford Bronco and do not currently have any wiring. For a plug-in 4-way harness, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # TK99VR. However, you need a separate wiring harness in addition to the # TK99VR to have the 7-way installed. For that part, that is the Universal Installation Kit for Trailer Brake Controller - 7-Way RV...
    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 Jameson C
Expert Research:
Jameson C
Employee Chris R
Video Edited:
Chris R
Employee Jonathan Y
Video by:
Jonathan Y
Employee Mike S
Written by:
Mike S
Employee Noah M
Updated by:
Noah M
Employee Bradley B
Test Fit:
Bradley B

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