Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
This item does not fit your vehicle
2003 Dodge Durango
These items fit your vehicle
2003 Dodge Durango
To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
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 and passenger's side tail lights. You will have to remove the tail light assemblies to access this harness. Once you've plugged in the T-connector, run the hot lead 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 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 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.
California residents: click here
The unit is installed. All components fit correctly. Instead of the four pin connector, I spliced the output lines into a Pollack 119988 connector. The colors of the two systems are different, but it is not a difficult change as the Pollack cinbector is labeled. The project finished up nicely with a factory outlet installed in the rear bumper.
The green conductor the runs between the left and right tail luminaires was only just as long as it needed to be. I would have liked a couple of inches more to allow it to be dressed tightly to the existing wiring harness in that section.
I found a spare spade connector in the fuse box of the engine room to attach the fuse holder inside the weather resistant fuse box rather than attach it to a stud on the battery post connector.
I used heat shrink style crimp connectors rather than the crimps supplied in the kit.
18 Tacoma w/out factory hitch- simple install no butt connectors- no poor connections
Works great. Installation is straightforward. The video tutorial on the website walks you right through it.
I installed this on my 2018 Tacoma. It was simple and straightforward. Took about one hour. It's all plug-and-play with the exception of the power wire that has to go to the battery, but that was super-easy if you have any electrical experience.
Brooke M.
3/27/2025
Thanks, Blaine! It's nice to have an idea on what to expect with this install
the wiring harness was of excellent quality and I saved a hundred dollars installing it myself . Thanks to your detailed and easy to understand etrailer video tutorial . thanks a lot !!!!!!
Everything you need although I would use my own connectors if I had to do it again
Everything was good got it very quickly, and could talk to someone on the phone about my order which was a big plus thank you very much
Jeff
3/7/2025
It worked out well
good product and great video instructio ns.
Had to go buy different heat shrink connectors, but the video and quality seem to be just what they described.
Perfect as ordered E trailers is the best with fast good shipping and clear instructions!
This product is totally worth the money!!!! Everything worked the first time .. the install was very easy, only thing that was a little difficult was running the positive cable from the battery to the rear bumber.. just take your time and follow the chassis, that was a big help.. I bought this product to install rear led brake light strip and wanted to hide the cables to give it a oem look.. would definitely recommend this product!
Super easy to install. It shipped to me the next day.
Does its job, very simple, longest part is running wires and securing with zip ties. Works great! If you watch the video on Etrailer from the older model you get a good idea of how it all goes together it’s only slightly different.
Installed easily. Just purchased to replace a failed unit. Works good!
Brooke M.
5/30/2025
Woop woop! Glad to hear that :) What are you towing with your set up?
Fits my 22 Tacoma great. If you're slightly handy, this is an easy install.
Hitch fit perfectly and took about a half hour to install in my driveway. Only basic tools and a torque wrench, no jacks required. Electrical took a little bit longer but the routing path in the Tacoma was ideal. The video was very helpful with the electrical. Being a cautious sort I used a 1/4” poly overwrap to further protect the provided heavy duty 12 gauge power wire. Measured idle current was around 1mA. Total job saved me hundreds over Toyota factory.
Very good customer service
Bought a trailer hitch and wiring for my truck. I couldn’t be happier with the products, service, price, fast and free delivery, and the customer phone service was extremely helpful when I had questions. I will definitely buy from trailer again.
The wiring harness arrived in perfect condition, It took me two hours to install. I bought heat shrink to weather proof the splices, I also purchased electrical grease for the connection's. Maybe I did not understand the video but it took me a while to understand that not every bulb had to be connected. If I had understood that it probably won't have taken two hour's also you will need more tie wraps.As others have said the wire to the battery does take time.But I was able to buy the extra supplies and a batt.ratchet,a heat gun and still saved MONEY doing it myself. I am pleased with my purchase.
Fairly simple for a 76yr old man to install. Very pleased with product.
2016 Toyota Tacoma SR, Did the job in about 35 min pretty straight forward.
Fit my 2021 Tacoma perfectly. Quick easy instill. My 8yr old helped to it was that easy.
Victoria H.
3/28/2025
That's awesome Todd! Sounds like everything came together seamlessly for you, and you were able to make a memory as well. Whenever you're ready for your next project, we'll be here :)
Works well, straightforward installatio n.
Easy to follow instructions and perfect fit made an easy install.
Also, quick response to missing items due to shipping issue (not etrailer's fault either.)A+++
The 4-pole wiring harness arrived quickly, actually earlier than expected, and installation was fairly simple. The eTrailer videos were a great help. The hardest part of the installation was running the power wire to the battery, just as described by others. I do recommend using heat shrink butt connectors they made the install look very water and weathertight.
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Nick
8/28/2025
Great product, 0 problems!