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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.
Features:
Specs:
Installation
This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side tail light housing and behind the driver's-side rear bumper. You will have to remove the skid plate and floor coverings 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.
Once installation is complete, the 4-way 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.
A tail light converter is built into this T-connector. This converter is a circuit-protected, battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.
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 the trailer. This converter combines 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.
Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.
Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.
Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.
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The box came with holes exposing the content of the box and causing scratches to the surface of the receiver of the hinch. The wire harness in the other hand came with no fisical damage.
Application: 2023 Toyota Venza. Took a couple of hours and everything hooked right up, no problem. Works perfectly on my home-built bike rack!
Well made products and I love the no-splice wire harness design. Great pricing and wonderful customer service. My shipping was free and fast and most appreciated is the videos you have on line regards installation. That totally sold me on your products!
This was fairly easy to install AFTER watching the video made by the folks here at Curt. I did find one thing that I did not like about the harness and that is the way that it goes through the floor of the vehicle. The video shows you how to remove the grommet in the floor and pass the enitre harness, plugs and all, through that grommet. With the limited space you have available this seemed fairly difficult. What I did to remedy this, and maybe Curt could modify the harness, was to cut the 4 wire and 2 wire portions that go through the grommet about 8" from the control box. Then I made just a small hole in the grommet, no need to remove it, and passed both wire bundles "up" through the grommet and then using but connector I reattached all wires. Other than this slight modification the installation, quality and overall product I feel if very good. Works as expected after installation!!!
Very easy to hook up. Have not tested it yet but there shouldn’t be any reason for it not to work. Very basic connections and if you follow the installation video it’s a piece of cake.
Lauren 
7/9/2025
Used multiple times and no complaints after a year. Very happy with it
I received my order from etrailer this past Friday. Friday night I installed the hitch in an hour. Saturday it took me about 5 hours to install the wiring kit. This may seem like a long time but this is my first experience with a car install like this. etrailer’s directions and video were outstanding. The most difficult part of the job was detaching Toyota’s wiring plugs. If I were to do the job again, I bet I could do it in under an hour! A great experience for me, so glad I did it. Looking forward to trailing my daughter’s stuff back and forth to school!
Installed with no problems. Would buy a gain.
The wires going to the light connections ore about one foot short to place the module in a good position area!
Outstanding quality wiring harness! AND YES the C57ER model does fit perfectly the 2024 VENZA LTE. Thanks again etrailer for a great experience. Now here are some hopefully helpful tidbits for anyone attempting to install this harness.
Follow the instructions since they are good. Except, in Step 3, you only need to loosen the drivers sidewall. Not necessary to repeat for the passenger panel. Once you do Step 1 that reveals the battery area which is all you need for connection of positive lead. A suggestion for Step 5, is to not do this until you have done Step 7 and have all connectors properly installed. It is easier then to position the black converter box and associated wiring. NOTE as for Step 8 this is not needed for installation on the vehicle since you already install the brown/red leads in Step 4! Skip Step 8 and move on! One last thing to remember is that you need to install the white wire with the ring terminal for connection to ground. The steps in the installation instructions does not advise you to do! It is stated on the bottom of page 6 with wiring diagram. I did not take any pictures but not sure if they would have added much to the installation instructions provided. A few hours of careful routing of wiring and you got yourself a nice hitch ready to go!
I liked the product. I modified the install in that I put the trailer connector through the rubber grommet. I cut and butt connected the jumper harness and the 4-pole connector. I cut the 6 wires about 4-6 inches from the black box and poked the 6 wires through the underside of the grommet and butt connected each one, so much easier than trying to push the male and female plug through the grommet. I thought it was much neater to have the harness zip tied to the trailer hitch and not have to dig into the rear hatch to be able to plug it in. I have the Curt 53201 Auxiliary Automotive LED Light Strips for Hitch Cargo Carrier, Bike Rack. So I use it a lot.
Will
12/11/2023
Still working perfectly. One thing to note is that the brake and signal lights on the 2021 Toyota Venza are completely obscured with my Thule hitch in both the lowered position and the folded up position. I ordered 2 sets of lights, CURT 53201 Auxiliary Automotive LED Light Strips for Hitch Cargo Carrier, Bike Rack, 2-Pack CURT. 1 for each position of the bike rack, lowered or folded up. I joined them with, Trailer Wiring Harness Universal 4 Way Flat Y-Splitter Plug and Play Adapter Extension Harness for LED Tailgate Light Bar and Trailer Lights
Works good!
This was not available in Canada yet for my Venza. Was exactly what I wanted was plug and play wiring. The video and instructions where easy to follow and took me 1 hr from start to finish.
Awesome video and easy to install! I have been buying from Etrailer for a long time and will continue to do so!
After a year, the wiring in this connection is still solid and works well. I would definitely recommend this connector!
everything plugged in just added a hot wire and ground
Very easy installation and it works without any issues.
This is the third trailer hitch I've ordered this year, and the package is always come completely mangled once they've arrived
Perfect
Axlz
6/17/2025
I have no complaints, the connector is still working wonderfully
The instructions seem fairly straightforward I don’t anticipate any problems
Easy install and simple solution for occasional trailer use.
Plastic enclosed item was intact. Has not been installed yet. We’ll see how well it works.
I ordered this hitch and wiring kit, and I got it in two days, that is unheard of since I live literally in the middle of nowhere. Price right and instructions are very good.
The shipping box was badly damaged (due to poor packing) as was the hitch inside. I contacted Customer Service for a replacement and am still waiting to hear back. Very disappointing.
Brooke M.
3/7/2024
I will make sure our customer service team reaches out to you about this. I am sorry that it arrived beat up like that.
I put the trailer wiring in a 2021 Toyota Venza. The wiring harness and associated parts were good. The installation instructions were somewhat difficult to figure out. Installing the wire harness was difficult. All of the floor panels and pieces around the spare tire have to be taken out. The most difficult part was removing and reinstalling the driver side panel that goes from the rear hatch door to the rear door. To enable access for the part of the wiring harness that goes thu the floor to connect to the taillights below the bumper.
Hitch was perfect. Trailer wiring kit was missing red, fuse holder battery connection. I alerted customer service.
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Victoria H.
4/14/2025
Happy to hear that the install videos were so valuable to you Mark! It sounds like everything came together smoothly for you. Towing anything fun?