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Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # C56279
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Custom Fit Vehicle Wiring

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Curt 4 Flat Custom Fit Vehicle Wiring - C56279
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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. Call 800-298-8924 to order Curt custom fit vehicle wiring part number C56279 or order online at etrailer.com. Free expert support on all Curt products. Guaranteed Lowest Price and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (12)
  • Q & A (1)
  • Videos (1)
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Curt Custom Fit Vehicle Wiring - C56279

  • Custom Fit
  • Trailer Hitch Wiring
  • Curt
  • 4 Flat
  • Powered Converter

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.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimal heat
    • Ensures superior operation in rough road conditions
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 6 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located in your rear cargo area. You will have to remove the rear scuff panel and floor coverings. Once you've plugged in the T-connector, run the hot lead up 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 in an out-of-the-way location within your rear cargo area.

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.

Powered Tail Light Converter with Surface-Mount Technology

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.

Curt SMT Circuit Boards

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.

56279 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56279 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Video of Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Curt Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C56279 Review

Today we're going to review part number C56279. This is the Curt T-connector vehicle wiring harness with the 4-way flat trailer connector. This is a custom fit part. It is designed to fit the Chevrolet City Express and the Nissan NV200 starting in 2013. Now on a custom fit part, I always recommend to go to our website, use our fit guide. Put in your year and model vehicle and it'll show you if this will work for your application.

Now this part will provide a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights. It does connect very quickly and easily. There's no cutting or splicing. Basically you just locate your connection points which are in the rear cargo area of the vehicle. You have these T-connectors that'll plug into the back of your tail lights and then you ground a wire and then run a hot lead to your vehicle's battery. This does include this converter right here.

This is to ensure that your vehicle's wiring will match that of your trailer. It is a powered module which means you'll run a power wire to your battery to power it. The reason they do that is to avoid overloading your vehicle's electrical system. This converter is constructed using SMT technology which is surface mount technology on the inside. It gives you consistent, reliable performance. It will also maximize your trailer light yield and intensity while producing minimal heat and also ensure superior operation under rough road conditions.

Again the 4-way is right over here. It's connected to this 16-gauge bonded wire. It also comes with this included dust cap and that dust cap would be . You just put it on to your 4-way and then when you're not plugged into your trailer, just put your dust cap over it and that'll protect those terminals from any of the elements or from damage to the terminals. Now this part does come with everything shown here. I'm going to show you where all these parts will go here in a minute.

Now this part is on this harness, the maximum amperage for the stop and turn light circuits is 3 amps per circuit. For the tail light circuit is 6 amps. Again, it comes with a nice set of detailed instructions. It'll show you with pictures where all your connection points are and tell you how to install it. Real quickly just to show you how to install it. You'll go to the rear of your vehicle and then, again, you'll get access to the back of the tail lights because that's where you'll plug these T-connectors in. What you want to do first is go to the driver's side and take the T-connector that has the yellow wire in it. That's for the left turn signal. You'll unplug the tail lights and then plug this T-connector in between the tail lights and the wiring harness. Then what you want to do is take your white wire that's connected here. It has an eyelet on it. Connect this to a good clean ground. If there isn't one you can make one using the included grounding screw. Then you'll take the other T-connector that has the long length of green wire. That's for the passenger's side, the right turn. What you'll do is run this all the way over to the passenger side. The same thing, unplug the tail lights, plug this in between them and then you'll have remaining this black wire. That's your power wire. You need to run this to the battery of your vehicle. They'll give you this extra, about 20-foot length of wire here. What you'll want to do is take one of your butt connectors, put it on the power wire, connect it to one end of this wire and then run this length of wire all the way up to the front. They do give you some cable ties if you have to take up any slack of this wire so it doesn't hang down or get in the way of anything. Once you get this to the front, you don't want to attach this right directly to the battery. You'll want to run it through this in-line fuse holder. You'll take this other butt connector and put it on the end, connect it to one end of the fuse holder. Then once that's connected, you'll take your other end of the fuse holder and use this eyelet connector. Install that and then this is what you'll connect to your positive post of your battery. Before you use your system, what you want to do is take the included 10-amp fuse, install it into the fuse holder, put your cap on and now your wiring harness is all hooked up and protected with the fuse and it's ready to go. If you run this out the back, plug it into your trailer, you should have lights on your trailer. Again, when you're not using it you could just wind this wire back up and keep it in the rear cargo area. That should do it for the review on part number C56279, the Curt T-connector vehicle wiring harness with the 4-way flat trailer connector. .

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56279

Average Customer Rating:  4.8 out of 5 stars   (12 Customer Reviews)

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.

- C56279

I'm very happy with this product. Everything installed easily and works perfectly. The customer service was very professional and helpful. The item was shipped promptly and arrived in a couple of days. I will not hesitate to purchase products from them in the future. 906269

- C56279

Not much to say. Just great Curt Mfg. quality. And as always from them, outstanding finishing. 893016

- C56279

easy install, wiring fit ,well planned and manufactured assembly. most difficult part was routing the main power connection to the battery. works well with utility trailer. 666329

- C56279

Easy install, works perfectly. Follow all instructions. 636752

- C56279
Chevrolet City Express

It really was an easy installation. Despite some friends saying there was no need to bring a new battery line to the harness, there certainly was and I'm glad I read and followed the instructions. My vehicle, the Chevy City Express, posed a challenge routing the power to the battery, but a safe route was found. It works great and I'm very satisfied. 590127

Very well. Just like day one!
Stephen M - 12/12/2019


- C56279

Wiring harness was super simple. Trailer hitch was also very easy to install. Will be using to tow small utility trailer. Great company to order great products from! 524404

- C56279
2017 Nissan NV200

Great setup will get install today ! Thank you 445565

- C56279
2017 Nissan NV200

I had a good experience, shopping with these folks.... good, quality products that actually fit and were promptly shipped. I'll be back. 427448

- C56279

great price high quality extreme fast shipping easy install 422111

- C56279

Haven't installedone yet but quality looks great 345859

- C56279

We are very happy with the wiring harness kit we purchased from you. It completely met our expectations at a great price! 327472

- C56279
2013 Nissan NV200

Timely delivery, easy installation, works great! I am very happy with the hitch, it saved me $ 300 if compared to the dealer quote. Looking forward to doing more business with you in the future! 215268


Ask the Experts about this Curt Custom Fit Vehicle Wiring

  • Trailer Hitch Recommendation for a 2015 Chevy City Express
    For your 2015 Chevy City Express cargo van the most popular option we carry is the Curt hitch part # C13165 which has been confirmed as a fit. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with clip, and a storage bag. If the ball mount kit does not include a ball...
    view full answer...

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Info for this part was:

Edited by:
Lindsey S
Installed by:
Cole B
Updated by:
Sarah W
Updated by:
Kristina F
Updated by:
Isabelle B
Written by:
Kristen H

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