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.
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