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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 # C56246
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Custom Fit Vehicle Wiring

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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. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56246 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 (18)
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  • Videos (3)
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CURT Custom Fit Vehicle Wiring - C56246

  • Custom Fit
  • 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: 5.0 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 trunk floor coverings and rear scuff panel and pull back on the trunk liner 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.

56246 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56246 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 T-Connector Vehicle Wiring Harness Installation - 2019 Subaru Legacy

Hey everyone, Shane here with Today, I have a 2019 Subaru Legacy. I'm gonna walk you how to install the CURT T-connector Vehicle Wiring Harness with four pole flat trailer harness. For our wires are going to look like when it's installed, it's going to be designed to live inside the vehicle and when we're ready to use it. You simply hang it out over top the rubber seal, make sure it's staying away from the connector point. Close your hatch, or close your trunk lid.

Connect it to your trailer and you're ready to go. When we're not using it, we can simply roll it up, throw our dust cap on it, and it can be stored right underneath our panel in our little storage compartment here above our spare tire. This is going to give us all the proper lighting functions that we're gonna need to safely tow a trailer, both turn signals, running lights and brake lights. It's going to come with a nice dust cap. So when we're not using it, simply install the dust cap on it keeps your connection from getting corroded or anything clogged inside of those.

We're going to have three amps per circuit for our stop and turn signals. Five amps per circuit for our tail lights. It's not going to be great for obviously pulling a trailer, but what if we had a cargo carrier or cargo box that was big enough that covered or partially covered tail lights, where nobody behind us can see what we're doing. There are options for some cargo carriers that you can mount lights on them. You simply plug this into them.

And then it gives you your running lights, your brake lights, and turn signals on the back of that cargo carrier. Basically take up for what's covering your lights so that again, really going you're safe. This is going to be adaptable to work with five, six, and seven pole plug, which you can find here at Etrailer. As far as the installation process, pretty simple and straightforward. I'm going to plug them behind each taillight.

So we don't have to do any splicing there. It's going to have a converter box, the converter box filled with potting material and what the converter box does it protects, the vehicle factory wiring from back, if there's a wiring issue on the trailer side. We're gonna have a power wire that runs up to the battery. It's going to be connected to a fuse holder and connected to the positive side of the battery. Other than that, that's all there really is to the installation portion. Now that we've gone over some of the features, let's go ahead and walk you out to get it done. Start your installation. We need to get in the truck. We're gonna remove our floor coverings, including the foam pad. That's sitting here underneath your floor. Once you get that removed, you're gonna take a trim panel tool on your threshold. You're gonna have three push pin fasteners. Remember to remove all three and then we're going to remove the threshold. We're just going to pull up and then we'll set that aside. And we're going to come to our panels. We're going to have the tie down, all we're going to do is spin it. And it'll allow you to pull it out, remove this fastener here. And then we're going to have one up here. Once you get those off, we'll be able to pull our liner out. We're gonna repeat that same process, on the other side. When it comes to the taillight on our driver's side. We're going to look through this white plug. We're going to push down on the taillight on the top. Disconnect the wiring on our wiring harness north, the yellow, red, and brown wire. We're going to install that in its place plug one end into the wire we just disconnect, the other one's going back into the taillight. And we'll have our ground wire. It's going to come with self tapper, however this bolt right here, holds our taillight in place and it's on a metal surface. So I'm just going to loosen that nut, slide this on and reinstall the nut. We can do it on either one of these. I think I might do it on this one. That way I can mount my converter box down here in this corner and it doesn't affect me putting this panel back in place. Taking that eight millimeter socket, we can remove that top. Ran two sided sticky tape from our kit, peel off one side install on our box. Doesn't really matter which side. Push it in place like that. I take our green wire and our four pole wire, we're going to run it right over to the center of the vehicle, just like that. Next we're going to take the black wire coming off our converter box. It's going to be pre-stripped and we're going to install the butt connector. We're going to take the bundle wire that comes with our kit it's going look like this. We're going to take one end we're going to strip it back and install it in the other end of the butt connector. I'm going to take some electrical tape and I'm going to run around that butt connector. Next we need to get the other end of our black wire out of the vehicle because we're going to be running up front and to engine compartment. There's a plug down in that corner that we can go through. However it's kind of hard to get to. We don't really have a plug here that we can just drive it through to. So if you look right here, we have a little flap. This is to release air pressure. When you close your doors. We can take our wire and we can feed it right down through one of them. And it'll come out underneath the vehicle. Once you have everything done on that side, you can go ahead and reinstall your panel. We're going to route the green wire over to our passenger side, install it the same way. That's when we need to get our black wire ran up to the front of the vehicle, to the engine compartment. Let me get it done real quick and I'll show you how I did it. When you're running your wire up, you want to make sure you're staying away from anything hot or moving. Since our exhaust is sitting right here, what I did is I took out this fastener, this fastener, took my wire and tucked in behind this plastic panel. Re-installed those, bring the wire right up you can see it right there. Behind here there's a bracket right there going over the top of it. Then you have these existing hard lines, right Existing wiring and hard lines over the top of everything here, it came down right over here. See we're my line is. Once they got to here, took out a couple of bolts here and then push the fasteners all the way up along this edge, pulled down this panel and tucked my wire up underneath. Once you get up, once we get up to here, right about this end, went straight across. This is my wire. I have a pull wire that I had sent down previously from up top, you can use a wire hanger and really use anything. I'm using an airline tube. I'm going to make sure when you run this up, you have your steering arm right here. It's going to rotate right here at this knuckle. So you can see what I did. I got behind this hard line, behind this hard line, behind the hard line there on top. When I pulled up my wire on these hard line they're going to hold my wire away from this knuckle. See where I came up, what I did is, I ran the wire back behind a brake booster, ran it through underneath this wire. I'm gonna run it underneath this positive cable here to the positive side of the battery. We're going to cut it down to size first. Might cut it about here. Strip back the end. Then add on a butt connector. You want to add heat shrink. You can add that on as well. You can find those here at Etrailer. They do not come with your kit though. Take off the two ends here on our fuse holder. One end, will go in here. I'm going to take some electrical tape. I'm going to tape up this end. Put this in we're going put a ring terminal. Then we're going to attach edge to the positive side of our battery. While we do that, I'm going to get my wire zip tied. Right in here. I'm going to run this through here. Through my cap. 12 millimeter socket and remove this nut. Take our ring terminal. Want to make sure that the fuse is not in the holder We install it on the positive side of the battery. Re-install the nut. Once we get it tight, we can install our fuse. Once we install the fuse, we can test it out and make sure it's working correctly. Then we'll test everything out and using part number I, two, six. Left turn, right turn, brake lights, running lights. Once you tested everything out, you know it's working correctly go ahead and install your dust cap. And you're ready to go. And if your looking at end installation on the car tee connector, we have a wiring harness with four pole flat trailer connector, on a 2019 Subaru legacy..

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56246

Average Customer Rating:  4.8 out of 5 stars   (18 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.


Great hitch. etrailer sells only the best. Hard to beat…

2016 Subaru Legacy

Wiring harness fit and works perfectly. Directions well written and helpful. Online video was also a huge help. Nice to keep it in the trunk, out of the weather, and away from corrosion, when not in use.

Still performing very well. No complaints.
Tom S - 03/16/2018

Subaru Legacy

The wiring harness was custom made to fit my Subaru Legacy. Routed the power from the battery into plastic tray under car and up through existing hole, behind left rear wheel and into trunk. Everything installs behind paneling inside the trunk, out of the way when not in use.


The wiring harness went on easily and the video was helpful.


Easy install looks great.

2017 Subaru Legacy

Love your site. Easy to find what you need and pay for it.....great job....easy works for use old types.....Shipping was fast and the item got to Olympia, Washington very fast. Good job all around. Will use your site again for sure. darrel w

Worked right up to the point the car was totaled from the rear. Good product.
Eugene W - 08/14/2018


Went together just like on youtube. The battery supply cable was plenty long and all equipment was included. It was very easy.


Incredible!! I couldn’t believe how exact and easy this intimidating looking kit installed. It was so much fun to actually do something that went as it was supposed to GREAT PRODUCT!!


Everything went together as shown on the video. I only watched it once and did the installation from memory. Great product at a good price.

2015 Subaru Legacy

The website was easy to use, and we found the right product easily. Delivery time was very reasonable. The part is now installed and works great. We are very happy with the purchase and with the company in general.

2019 Subaru Legacy

Great product, was delivered about an hour ago and I installed it in about 30 mins without any issues.

2019 Subaru Legacy

2015 Subaru Legacy

Works great

2016 Subaru Legacy

2016 Subaru Legacy



2015 Subaru Legacy


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

  • Where Does Power Wire of Curt Trailer Wiring # C56243 go To
    Realistically that would probably be fine, but since we know Curt won't honor the warranty unless it's ran directly to the battery we can't recommend you go about the install in any other way. If you can find a safer way to run the power wire though that would be a great idea. Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits...
    view full answer...
  • Trailer Wiring Harness Compatible with 2020 Subaru Legacy
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56246 is not listed as a fit by the manufacturer and they do not a list a fit. I reached out to Tekonsha and the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT is a fit and does not require any splicing into your factory wiring. This is my recommendation for your 2020 Subaru Legacy. I've attached a video to assist.
    view full answer...
  • 4-Pole Trailer Wiring Harness for 2016 Subaru Legacy
    There is no issue installing a 4-pole trailer wiring harness like # 118671 or # C56246 on your 2016 Legacy that has the Subaru EyeSight collision avoidance system. Lots of our Subaru-owner customers have done so. Between these two items I recommend the Tekonsha # 118671, which is shown in the linked installation video, since we have found their harnesses to be very reliable. The Eyesight system is based around several cameras that monitor road conditions and generate warnings. The wiring...
    view full answer...
  • What 2" Hitch do You Recommend for My 2019 Subaru Legacy?
    For your 2019 Subaru Legacy, I recommend the etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2" # e99YR. This hitch comes with the easiest installation process out of any hitch we carry for your vehicle. It only takes about 1 hour and includes all of the mounting hardware required for installation. If you plan to use non-trailer loads such as bike racks or cargo carriers, you need to use stabilizing straps # 18050 with those accessories. If you do plan on...
    view full answer...

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Info for this part was:

Employee Andrew K
Video by:
Andrew K
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Video Edited:
Kathleen M
Employee Laura H
Written by:
Laura H
Employee Randy B
Test Fit:
Randy B
Employee Shane H
Test Fit:
Shane H
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B

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