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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 # C79CR
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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. 1-800-496-5010 to order CURT custom fit vehicle wiring part number C79CR or order online at 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 (3)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C79CR

  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • CURT

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 behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes powered tail light converter that 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: 3.0 amps per circuit
    • Tail lights: 6.0 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light trim fasteners and trim piece and remove the tail light to access these connection points. 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 beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

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.

56444 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C79CR Installation instructions

This Product Fits The Following Vehicles

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 Review of Curt Custom Fit Vehicle Wiring - Subaru Legacy Trailer Hitch Wiring - C79CR

Michael: Hi there. I'm Michael with Today, we're going to take a quick look at the CURT T-Connector Vehicle Wiring Harness System. This is going to provide the 4-pole flat trailer connector for your vehicle so that you can pull a trailer and have the trailer's lights reflect what your vehicles lights are doing.The really nice thing about this system is how easy it is to get installed. Basically, you're just going to need to get back behind your tail lights. This main cord here with the yellow, brown, white, and red.

This is going to plug into the back side of your tail lights and then to the plug where your tail lights are currently plugged in. So it's going to send that signal out to your trailer wiring, but then it's also going to re-complete that signal so that your tail lights on your vehicle still work.So once you get that substituted for your current setup, you'll just need to ground your white ground wire. They do include a self-tapping screw to get that ground to just a metal surface behind your tail lights would work. You'll mount the box here somewhere back behind there. It depends on your preference where you want to get this mounted up.

They do include some double-sided adhesive here to easily allow you to mount that on a flat surface.Then you'll run the green and white wire portion over to your passenger side tail lights. So this will be on your driver's side. This'll be your passenger side. Same process. Just unplug your light, plug this in to where the tail light is already plugged in, and then pull your tail lights into this and you'll be ready to go.They also have this black power wire here.

This is going to run up to your vehicle's battery. So it's not pulling too much power from your tail light signals, causing issues there. So they do include wire for you to run up to the front of your vehicle, to tap into your vehicle's battery. When you run this, you do want to make sure that you're staying away from anything that's hot or moving on your vehicle. So it's not to damage the wire, but they do include some zip ties here to help you get that mounted up in place.

So it will stay out of your way.Once you get up to the front of the vehicle, they do include a fuse box here, so the antifuse, so that you can easily tap into the wire that you've got run up to your battery. And then include a ring terminal to put onto your battery. This fuse is just obviously going to help protect the whole system from any backfeed from the trailer or sending it out to the trailer.So everything that you need to get this installed is included. They've even included a little dust cap for your 4-pole plug here, so that you can keep dirt and debris, moisture off of the plug if you are going to store it outside your vehicle. This whole system is designed to work for your 2020 and newer Subaru Legacy. Sorry. It is going to work seamlessly for you to provide that 4-pole flat trailer connector. This is compatible with your 5-pole, 6-pole and 7-pole adapters. Those are sold separately, but if your trailer needs any of those options, you can add on an adapter for your 4-pole system.Overall, it's just going to be very simple to get installed. One reason I really like this, you're not going to have to worry about doing a whole lot of wiring. Basically just crimping your extension wire up to your battery and they do include the butt connectors for that. So it's a very simple process. Just plugging it in.You're not going to have to worry about damaging your vehicle's wiring by slicing into it or anything like that. So it's a good way to go if you are needing trailer wiring for your vehicle. So that's going to complete our look for today. Again, I'm Michael with Thanks for watching.

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C79CR

Average Customer Rating:  4.3 out of 5 stars   (3 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.


wiring kit was easy install similar to all others


Easy install and works well!



See what our Experts say about this CURT Custom Fit Vehicle Wiring

  • Trailer Hitch and Trailer Wiring Harness for 2021 Subaru Legacy Sedan
    According to Curt, the # C67JR Class III hitch fits all models of the 2021 Subaru Legacy, including the Premium and Sport. The only near-plug and play trailer wiring harness available would be the Curt # C79CR which does require that a circuit be ran to the battery positive terminal using the included wire, hardware and inline fuse. I'll link to the installation instructions for the hitch and the trailer wiring harness, as well as to a help article that addresses how to run the trailer...
    view full answer...
  • Does Curt 4-Way Wiring Harness For 2022 Subaru Legacy Interfere With Any EyeSight Features
    Nope, none of the EyeSight features on your 2022 Subaru Legacy will be interfered with whatsoever when installing the Curt 4-way wiring harness that fits, which is the following part number: - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C79CR The Curt # C79CR plugs into the taillights on your Subaru so it knows when to activate the turn and brake signals on your trailer, but that's all it does; the 4-way won't have an affect on any part of your electrical...
    view full answer...
  • Trailer Hitch and Wiring that Fits 2022 Subaru Legacy
    Since there were no changes to the Subaru Legacy in 2022 the etrailer hitch part # e25TR is a confirmed fit for it. Then for trailer wiring we have the Curt # C79CR which would work great as well.
    view full answer...
  • Recommended Trailer Hitch for 2020 Subaru Legacy
    The Curt Class III hitch, part # C67JR is a fit for all models of the 2020 and 2021 7th Gen Subaru Legacy, including the Touring XT. If you'll be using the hitch for towing, you'll also need a trailer wiring harness like # C79CR, a ball mount like # 2923, and a trailer ball like # 19260 for a 1-7/8 or # 63845 for a 2 inch. I've linked to an install video for the hitch I recommended.
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Written by:
Kristina F
Employee Michael B
Installed by:
Michael B

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