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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.
Features:
Specs:
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.
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.
Average Customer Rating: 4.4 out of 5 stars (51 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.Everything works as it should except on the right brake like comes on when hooked to a trailer. I’ve tried multiple trailers with the same issue on each one. Can’t get the left brake light to come on
Defective product. After about 4 months the driver side light stopped working. Dealership said it was this product that caused the problem. It was disconnected and $500 later the light works now.
This is wired wrong from the factory. On a 2021 Bronco FE the turn signal lights will light up when hitting the brakes. I moved the pin in the plug and now the brake lights light up when hitting the RV brakes. While on my travels I see multiple Broncos being flat towed with the yellow turn signal lights coming on while the RV is braking. They decided to not make the adjustment and wire it as supplied.
Brooke M.
6/12/2023
After reaching out to the manufacturer about this, it sounds like maybe your Bronco has incandescent bulbs, and this part for LEDs. The wiring harness for incandescent bulbs is part # TK33VR. Your vehicles owners manual should tell you what kind of bulb you have if you are unsure.
Install took quite awhile and will have to get some type of bracket for plug just hangs there. Still don’t understand why you have to run wire to battery! A lot of extra time. But have to say it works perfectly.
Brooke M.
3/3/2023
Oh, good! Nice to see that the harness is doing its job well. I just wanted to briefly explain the black wire that runs to the battery. Essentially, it is there so that the harness draws power directly from the battery of the vehicle and not from the tail lights. Since the wiring systems in newer vehicles can be much more delicate, wiring it this way can prevent issues on the tow vehicle and trailer wiring. Although it is more work, installing it this way does give a little peace of mind knowing it is better protected this way.
I think the person who wired this system up was sick on wiring day. This is a plug n play system. It don’t take rocket science to install the harness. I installed the harness step by step and when you hit the right blinker, all lights flash as if your 4 way flashers were on. When I hit the left blinker, nothing happens. But however the taillights and brake lights work fine. Not happy with the product. Waste of my time and money.
Katrina B.
8/4/2022
Its unfortunate that you are having this problem. If you are still needing some assistance, please contact our tech department and they will be more than happy to assist you in getting this wired correctly.
Easy to install. I took longer, just because I wrapped the harness in Convoluted tubing and added an extra lighting at the same time.
It did not work properly on my 2022 Bronco Big Bend model. The local installer had to use another product. Your service is good. But sometimes the product just doesn't match up.
Jenny N.
9/23/2022
I am sorry to hear that the harness did not work for you. I would like to look into this and I have a few questions that I would like to ask. Does your Bronco have LED tail lights? Is your Bronco a Sport model? Can you tell me in more detail what happened with the harness?
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.
Jenny N.
3/30/2022
I will have our Customer Service team reach out to you. For a 2021 Ford Bronco without LED lights you will need part # TK33VR.
Works great, easy to install if you follow the awesome installation video by etrailer.
Easy insulation! Worked perfect! No issues. If you are looking to add a trailer hitch to a Bronco, this is the part for you!
Wired in my vehicle as advertised. Easy to do.
Perfect fit for 2022 Ford Bronco.
Arrived on time. Installed easily. I had technical questions. etrailer responded quickly. Great service.
Super easy instructions for easy installation. So very proud to say that I did the install myself. Thanks for a great after market product.
Works as should very easy to install
Use this web site to make the kit work on base models (non-led).
Jenny N.
3/1/2022
For the 2021 Ford Bronco without LED tail lights you would want to use part # C87BR.
Easy install. Operates as advertised
Easy to install
Rich
12/22/2023
Light harness has held up well with no issues. Would definitely buy it again over the factory harness that is more than double the cost.
Easy install.
Quick and painless install. Fits my 2002 Forb Bronco Badlands
Awesome!
Very well made, good value for the momey
package came packed well.
Fast shipping, won't know until after I get my Bronco and do the install.
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Jenny N.
3/13/2024
I hate to hear that the harness is not working for you. There could be a few different reasons why it is not working. I recommend checking to make sure that the connectors are seated together tightly. And that a fuse has not blown or missing that is on the harness. Also make sure the ground is grounded to bare metal. I have an FAQ below that explains ways to trouble shoot in more detail. If this does not work for you, please let me know.
Helpful Links
faq-4-5-way-troubleshooting.aspx