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Wiring a trailer can be tricky if you have to cut into factory wires, but this Curt T-Connector Vehicle Wiring Harness skips all that. It plugs directly into the vehicle’s tail light wiring, creating a 4-way flat connector for your trailer lights. No splicing or guessing which wire does what—just plug it in and it’s ready to go.
Instead of pulling power from the tail light circuit, the harness uses a powered converter that runs a direct line to the vehicle’s battery. This isolates the trailer wiring from the vehicle system and keeps sensitive electronics safe from overload or short circuits. It delivers smooth power for running, turn, and brake lights while keeping your vehicle wiring protected.
The 4-flat connector gives you the essential lighting functions—running lights, brake lights, and turn signals—so your trailer is ready for simple towing setups like small utility trailers or boat trailers. It’s the common connection type for most light-duty towing tasks.
The harness is designed to stay out of sight once installed. The wiring tucks neatly behind trim panels and exits cleanly near the hitch area for a professional look. It’s a hidden setup that keeps everything secure and protected from road debris while looking like it came from the factory.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Paul
12/8/2022
No problems with the wiring harness for the past year.
Laura E.
6/21/2017
Thanks for your business and your review, Robert. You should not use the power outlets to install a wiring harness.The reasons are that doing so will void the wiring harness warranty because it is not tested or designed for that type of installation. The circuit for a power outlet could be overloaded by the draw of a trailer wiring harness. And if attached to a power outlet you lose that level of circuit protection between the trailer and vehicle so if there is a severe short on the trailer it can end up damaging electrical components on the vehicle. I have included a link to a help article with tips on routing trailer wiring harness power wires. That link may be found at:
Helpful Links
Vern
6/24/2015
I M VERY HAPPY with the products and recomemd you site to everyone I can.
Joe M.
6/9/2016
Great! No problems so far!
Larry R.
3/10/2016
It is still working perfectly fine with no issues. It is a great product.
Patrick B.
4/4/2013
That is exactly why we work so hard to have videos of our products. Sometimes a different look can make all the difference in an install. As soon as we have a 2013 RAV 4 come through our shop, we will have wiring videos available on the site.
Mike
4/11/2013
Getting a 2013 rav next week. Any additionall light you can shed on removing plastic pcs. or where you ran hot wire would make me forever in your debt. I am a little bit of a detail frek also.Thanks.Mike
Patrick B.
4/24/2013
Ron
4/25/2013
Mike,One suggestion I have for removing the plastic interior panels is to purchase a set of nylon pry bars designed for this purpose. I used these from Harbor Freight tools:http:/www.harborfreight.com/4-piece-nylon-pry-bar-installer-kit-69668.htmlinexpensive and worth every cent!Along with the screws and bolts mentioned in the instructions, there are many plastic retainers that will be pulled straight out to remove. Be careful not to them since the do slide out of their mount brackets.I ran the hot wire to the battery through a rubber plug under the spare tire and under the Rav to the front. There are plenty places to tie wrap along the way forward and secure it. I did run it through a hole in the frame and made sure to use a grommet to assure that it did not chafe and short out.I also ran the 4 way plug through the same rubber plug under the spare and routed it to the tab on the hitch and secured it. All wires were then sealed with silicone on the rubber plug.I hope some of that is a help for you.Ron
Patrick B.
4/25/2013
Harry W.
10/6/2014
Good call on where to push power cable through fire wall. You saved us some time. Thanks!
Randy P.
9/13/2015
The was only hard to install because of my age, 73. Although routing the wiring was a little difficult, directions where OK. Its a good product, thanksRandall
Richard
2/10/2018
Working very well thank you.
Rolo
2/13/2025
It’s been a little over a year and the Curt T connector has done its job. On the 2017 Rav 4 that tows a small boat, I have encountered no problems. It’s why I keep coming back to eTrailer.
Kate F.
2/13/2025
Heather A.
10/12/2021
Thank you for your review. It is easy to run out of length of the black power wire. I recommend to take a look at the article I linked that helps explain the best way to route the wire.
Helpful Links
Jenny N.
2/2/2023
You have a few options available when it comes to where your harness ends up. You can just pull the harness out of the back door of the 2016 Rav4 whenever you want to use it. And store it back in the cargo area when done. It would be the best way to protect the harness from the elements. However, if you are so inclined, it can be moved to stored on the hitch. You can route the 4-Way through the vehicle and outside to attach it to the bracket rather than storing the harness in the vehicle when not in use. To do this you will need to get down to the metal floor of the cargo area by removing any plastic or carpeted panels that are in the way. Once down to the metal look for a grommet or other exit point through which you can route the wiring. If there is not one, then a hole will have to be drilled. If you have to drill, be careful of what is on the other side of where you are drilling! Once the 4-Way end has been routed through the grommet or hole be sure to seal up the hole using silicone such as part # 0160297 to keep out fumes and moisture. You can use the built in bracket on the Draw Tite hitch along with part # 18144 to hold the 4-way in place. Or you can use a magnetic 4-way holder like part # 306-X6019 that would give you more flexibility of where on the hitch to hold the 4-flat too.
Lou M.
7/9/2019
Still works great!
Jeff S.
7/9/2017
Unit is still in great working shape. I installed according to the manufacturer instructions and have had no problems. I am very satisfied with the product.
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Chuck K.
7/21/2016
Everything is working fine. No problems, no issues. Happy with purchase.