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Hooking up trailer lights doesn’t need to be complicated. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into the vehicle’s existing tail light wiring. There’s no cutting or splicing—just pop the connectors in behind each tail light and you’re ready to go. The built-in converter handles the signal transfer for running lights, turn signals, and brake lights so everything works right from the start.
The harness connects behind the tail lights using factory-style plugs, keeping the install hidden and tidy. Once connected, you can route the 4-flat wire out through the trunk or a rear panel when towing, then tuck it away when you’re not. It gives you a clean setup that’s ready when you need it without extra loose wiring hanging around.
A solid ground is key to good trailer lighting, and this harness makes that easy. The white ground wire comes with a ring terminal to mount directly to bare metal on the frame. When grounded properly, it keeps your running, turn, and brake lights consistent without flickering or weak signals.
The 4-pole flat connector provides power for running lights, turn signals, and brake lights—the standard setup for small and midsize trailers. It’s ready to pair with accessories like a 7-way adapter if you decide to add a brake controller or need a charging circuit later on.
The included dust cover keeps dirt and water out of the connector when it’s not in use. It helps prevent corrosion so your trailer lighting stays reliable season after season. When it’s time to tow, just remove the cap, plug in the trailer, and hit the road knowing your wiring is ready to work.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
My wife and I installed a 2" Curt trailer hitch (and wiring) on our 2015 Mazda CX-5. Total installation time was about 2 hours. We didn't have any problems with the instillation of the hitch or wiring. Etrailer has a video link available, which should be viewed before you begin your installation. However, there wasn't any audio with this.
The hitch is solid and appears to be well built. Occasionally, we pull a small aluminum trailer loaded with kayaks, or other light items.
We have ordered from Etrailer before and feel they are a good company to do business with.
Shipping was prompt and without issues. The install
On my 2014 Mazda cx5 was easy and stright forward. I watched the install video on the product page for CX5, and just
Followed the steps in video. Took 10min to remove interior panels, ect, and 10 min to make all plug and play connections, no issues.
Then 10min to put panels back in place. Tested the flat connector
As described in video. Works perfectly. This is after I went to Uhaul and they spent almost 2 hours under my CX5 baffled and unable to install a traditional trailer wire kit. I left with hitch only and installed this plug and play kit, completely satisfied.
Jeff
5/17/2015
Thanks so much.
Haven’t installed it yet but the purchase and delivery went better than expected, thanks
Ordered a trailer hitch for a Mazda CX-5. The etrailer team was knowledgeable, and I got exactly what I needed. The hitch fits perfectly and works great!
Grg M.
9/4/2025
perfect
Wow, instaler en 5 minute. Fonctionne a merveille. J avait essayé une connecteur universel et ca desactivait mon cruise control lorsque je mettais mon clignotant. Avec ce produit ca fonctionne a merveille. Merci e trailer.
This wiring harness was easier to install than I expected. 10 minutes from start to finish! Excellent product design! Excellent instructions!
Too easy to install!! I wish I could have found kits like this years ago! .. Kits like this should be the standard!
Easy install, love the plug in. Works G REAT!
Just what I needed. Was easy to install and works great.
2012 Honda Civic. Easy installation.
Kit very easy to use and the video was great!
This harness made it super easy to add trailer wiring to my CX-5. Watching the video helped a lot. Along with a Curt Auxiliary lighting kit I was able to make a light bar for my Hollywood bike rack.
The cataloging was a little confusing and ordered the wrong one the first time, it was easy to install and works as it should
Harness worked very well. Easy to insta ll.
Frederick
2/20/2026
Great works everytime. No issuse at all
Heather A.
2/20/2026
I installed this on my 2015 Honda Accord for the purpose of pulling my small aluminum fishing boat and trailer. Works great!
Any trailer tires, tow bars and towing equipment I have ever bought has been with e-trailer. These folks offer STELLAR service,always there for any assistance you may need and if there is an issue they are quick to resolve the problem. The only place I shop for all my towing needs. The Best of the Best. Thank You eh trailer for your years of legendary service.
Dale
Another great product from etrailer. High quality wiring. Everything encapsulated in high quality seals keeping connections water tight. Easy snap connection fittings. Easy original equipment install. Highly recommend.
The hitch was great and went on without a problem. Wiring also worked great. Done! I bought from you because of your videos and they made installation so much easier. I am a do it yourselfer but at 73 was thankful for all you information and help via the videos. Would recommend your site to anyone in need of a hitch.
Easy Plug and Palay installation on my 2015 Mazda CX5
instructions were a little lacking in clarity, but good otherwise.
Plug and play easy.
Excellent product, super easy plug and play, had the panels off and everything plugged in and put back together in under 15 minutes.
Super Easy to install on my 2015 civic, the connectors for the brake and blinker lights are different sizes so its easy to match up. There was a factory ground screw right near the driver side taillight housing so I used that. I did this in about 20 minutes
I am quite happy with this wiring kit! It truly is plug and play!!
After watching the video, the install was quick and easy.
I only deviated from the install video, where it concerns the ground wire.
It says to use a drill and make a 3/32 hole and use the self tapping screw, if you can not find an existing place to mount the ground wire.
On the CX-5 there is a perfectly placed nut that can be used, and you dont even need any extra tools above what the kit calls for.
When you pull off the plugs for the drivers side tail lights, you will also see 3 10mm nuts that hold the tail light in place.
Just remove the one below the brake light, and slip the ground wire over it and replace the nut.
Tim W.
7/27/2018
I havent had to pull any more trailers, but I have no doubt it will work just fine, the next time I need to unroll it from the spare tire well!
Went together perfectly, just like in the helpful videos. I just put the laptop in that area to watch the video (one for thehitch and one for the wiring harness) and hit the pause after each step.
Info for this part was:
At etrailer 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.
Michael G.
9/16/2015
Weve had our Curt hitch for over a year now and it still looks like new. Were very satisfied and recommend Curt and Etrailer.