To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Getting trailer lights working doesn’t have to mean cutting into factory wires. The Curt T-Connector plugs in line with the existing tail light wiring to give you a clean 4-flat trailer connector. It’s all plug-and-play, so you can have a fully functional lighting setup without any wire splicing or guesswork.
The 4-pole lead is long enough to route out to a hitch-mounted bracket when you’re towing, but it can also stay stored inside the vehicle between trips. Keeping the connector tucked away guards it from moisture, road salt, and grime—helping prevent corrosion and saving you from lighting issues later on.
This harness includes an integrated converter that separates the vehicle wiring from the trailer system. It avoids the small power bleed that can dimly light LED bulbs on some setups and helps ensure clean signal transfer for running lights, turn signals, and brake lights.
The 4-flat connection provides the basics—running lights, left and right turn signals, and brake lights—so your trailer stays visible and legal on the road. It’s compatible with most light-duty trailers and works seamlessly with typical hitch brackets for a tidy installation.

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello everybody, this is Jeff at etrailer.com. Today, we're gonna take a look at the CURT T-connector vehicle wiring harness with the four-way flat trailer connector. Now, this is a custom fit part. It is designed to fit the 1997 to 2003 Infiniti QX4, fits the 1996 to 2004 Nissan Pathfinder, and the 1998 to 2001 Nissan Altima. And on a custom fit part like this, I do like to recommend for you to go to our website, use the fit guide, put in your year and model vehicle, and it'll show if this will work for your application. Now, this kit here provides this four-way flat trailer connector at the back of your vehicle to power your trailer signal lights.
It is compatible with five pole, six pole, and seven-pole adapters that we do so separately. And this does connect very quickly and easily. There's no cutting or splicing of wires. All you have to do is locate your connection points, which will be behind the taillight housing. Plug in these connectors here, one on each side, and then ground your white wire here that's on the driver's side to a close nearby ground.
Now, it does include this black box. This is the taillight converter and this is to ensure that your vehicle's wire will match that of your trailer. This is a powered module, connects directly to the battery to avoid overloading your vehicle's electrical system. And this is constructed using SMT technology, which is surface-mount technology. Gives you more consistent, reliable performance and it'll maximize your trailer light yield and intensity while producing minimal heat.
Also ensures superior operation in rough road conditions. Few specs on this harness, the maximum amperage for the stop and turn lights is three amps per circuit. For the taillights, six amps per circuit. And it does come with everything laid out here on the table. Comes with a nice set of instructions that'll show you where your connection points are.
But basically what you do again is go to the rear of the vehicle, get access to behind the taillight housings, and you'll start on the driver's side. Take the one with the yellow wire in it and you'll connect that to the behind the taillight housing. And then you'll take this one with the green wire and this is a length of wire that'll run over to the passenger side, plug in behind the passenger side taillight. And we mentioned this white wire with the eyelid on it, that's for to connect to a ground. So if there's a nearby ground, you can connect it. If not, they do include a grounding screw that you can make your own ground. And then this converter box does have a little weight to it, so don't want it bouncing around. You can attach it to a nice flat surface with the included double face tape to attach it down. They do give you some extra cable ties to take up any slack in the wiring. And then you run your four-way out to the back to plug into your trailer. Now, if you're not plugged into your trailer, it does include this dust cover that you can attach to this plug, and you can leave it attached if you want. But when you're not plugged in, all you have to do is put it onto the connectors just like that and it'll protect those terminals from the elements or from any damage when you're not plugged in. But that should do it for a look at this CURT T-connector vehicle wiring harness with the four-way flat trailer connector.
Customer Satisfaction Score:
88% were satisfied with this product
12% of customers were not satisfied
Ratings & Reviews
Excelente
Fits well, no problems
Sent with another order and was easy to install. Very Pleased!
Robert R., Fremont, CA
Great product, reasonable price and fast delivery; what else can you ask for?
I have an old 2002 Pathfinder. The video was a tremendous help and it was easy to install. Good job.
great quality works flawlessly one year latter looks like new
It works great. Easy installation had it hooked up in less than 5 mins
paper instructions were way to vague for me to follow. The video instructions were spot on and easy/quick to install. And it works!
Great and easy combination to go with h itch!!
I could not believe how quickly I received my order. I order online all the time, this was the quickest turn around I've experienced. Order was complete and I'm exstatic.
Very easy installation. Service was quick and the quality of the product was impressive. I had it installed in about 30 minutes!
Installation was a breeze. Loved how easy it was to find what I need on the site. Shipping was cheap too.
Product helped me connect my trailer lights!
THANK YOU ETRAILER! WENT THROUGH ANOTHER SITE AND WAS SENT AN INCORRECT PRODUCT. A hassle to return and even harder to get a reply from the company. Thank you for your great customer service! You are highly recommended and I will order from you in the future for all accessories needed for my truck. Thanks again!
I was told about etrailer from an acquaintance. He said your prices were the best and your customer service was outstanding. After placing my order and receiving my products I have to say, I agree with him 100%! Ordered my items on Friday receive them on Monday... Good quality, fast delivery, fair price what else can I say! I will definitely refer etrailer and use your company in the future.
Perfect fit, quick shipping, and performance is as advertised. It’s been dunked in salt water countless times, and works just fine on my 2001 Nissan Pathfinder.
This wire harness gave me no troubles. Just plugged straight into my tail light plugs and did not short me on wire. The trailer lights plug is perfect length.
Works like it’s supposed to. Good instructions. Transaction easy, shipping quick.
I wish that the instructions had been a bit more clear. Install was easy once figured out. Fair price.
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.








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.