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Wiring a trailer can be tricky, but this Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector keeps things simple. It plugs right into the existing tail light wiring, so there’s no cutting or splicing needed. The connectors match up cleanly and lock in place for a solid, trouble-free setup.
Running trailer lights off your vehicle’s own circuits can overload them. This harness solves that problem with a powered converter that takes its power directly from the battery, not the tail lights. That means your car’s wiring stays protected and you still get full, reliable lighting on the trailer.
LED trailer lights draw less current but can confuse some wiring systems. This harness handles that perfectly, delivering steady signals for turn, brake, and running lights. Whether your trailer has traditional bulbs or LEDs, everything functions just as it should.
Once installed, the 4-flat connector sits neatly at the back of the vehicle and plugs right into most trailers. It provides running light, turn signal, and brake light functions in one compact plug that’s easy to reach when you’re ready to tow.
Customer Satisfaction Score:
86% were satisfied with this product
14% of customers were not satisfied
Ratings & Reviews
Good product, Great service!!
work out great. thanks Bobby.
great working product for a fair price after using their 110% low price guarentee.
Good product. Battery lead could have been a little longer for 5 stars. All plugs fit my 2005 honda civic sedan.
The harness was super easy to install and works flawlessly. The hardest part is getting power to the trunk but i had already installed terminals back there which this seamlessly connected to.
I bought this TRAILER Connector to replace the same unit that went bad after 7 years. Installation was easy.
From customer service to the price with shipping, excellent. Please keep up the great work.
Awesome product and customer service!
This unit worked for me at first and was easy to wire, but shorted out in under a year leaving me with no trailer lights
This product is amazing! It took me only two hours to install the hitch and the wiring harness on my 2004 Honda Civic Hybrid. The plug in terminals take all the guesswork out of finding the right wires and the only mildly challenging task was running the power wire from the battery to the power module. The videos gave me the general sense of what to do...and it really was easy! I plan on towing a Yakima Rack and Roll with my kayak so I should be set to go. Thanks for a great product!
Installation took a few hours, but with time and patience it was fairly straight-forward. I installed this connector onto a 2002 Honda Civic, so the battery was on the passenger side and had to re-design based off the documentation that the thing came with. I would recommend getting a connector tester from Harbor Freight
Easy install. A little bit annoying to run the wire to the battery, but a necessary evil with any kit. Works great!
Gwendolyn Y.
3/7/2025
I totally agree about the wire to the battery part. Maybe one day we wont have to :)
The perfect fit and perfect price. Easy installation and I was able to do it myself in under an hour. The most time-consuming part, that wasn't even an issue, was fishing the powerline from the rear to the battery. I have not towed anything with it yet but I have hooked it up to my trailer and everything worked as expected. I'm very happy I found etrailer.com and will definitely use their website again
I purchased before from etrailer. I was never disappointed.
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Aries
3/30/2024
Everything works as good as it did when I first bought it!