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  4. Trailer Hitch Wiring
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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 # C56040
Retail:$59.33
Our Price: $35.55
You Save: 40%
Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. 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 C56040 or order online at etrailer.com. Free expert support on all CURT products. Great prices 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 (2425)
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CURT Custom Fit Vehicle Wiring - C56040

  • 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. Connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.


Features:

  • 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 - no cutting or splicing of wires
    • Locate connection point in rear cargo area
    • Plug in connector
  • 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


Specs:

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


Installation

This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the interior trim panel in your rear cargo area. Once you've plugged in the converter, insert the included 10-amp fuse into the integrated fuse holder.


Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location within your cargo area. Adhere the black converter box to the frame of the car using the double-sided tape provided. Secure any loose parts of the T-connector with the provided cable ties.


It is recommended that you use a small amount of grease on all electrical connections - the plug 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.


2010 Subaru with Backup Sensors

56040 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56040 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:


Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56040

Average Customer Rating:  4.9 out of 5 stars   (2425 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.

by:
2024 Subaru Outback Wagon

Love it. You guys always have the best information, advice and products. Well done with this product too. Everything you need is included in the order, other than an electric drill. Plenty of length too. I was able to run it through the grommet under the spare tire and link up to the trailer pin. I can’t stand the idea of just letting the wire run under the trunk hatch since it needs to be hooked up to my bike rack.



by:
2023 Subaru Outback Wagon

Everything arrived in great condition and a lot sooner than I expected. I was even able to install it over the weekend.

I love the way most of the hitch is tucked away, out of sight. Can't wait to tow my boat and get back on the water.

The trailer wiring harness was super easy to install and tuck's away while not in use.

All in all, I am super satisfied with the whole experience. From the high quality of the product, timeliness of delivery, and minimal or low level of effort to stall the whole thing.

Thanks for everything. I attached some before and after photos.



by:
2021 Subaru Forester

Ordered hitch from etrailer it arrived quickly. I waited to to install until the weather warmed up, paperwork says install time for expert 30 minutes, novice 1 hour. I spent about 2 hours installing it by myself. the packaged parts contained all the parts needed for install, along with threaded wire to help with install. the most difficult part was supping hitch into position, and applying flange nuts. had to use ratchet straps to pull into place.all in all anyone who has some mechanical ability should be able to install it.Note: you will need a torque wrench in final assembly.



by:
2013 Subaru XV Crosstrek

Hitch works great and when I don’t use it the wiring harness goes right in with my spare tire keeping it from getting road salt all over it!! Thanks eTrailer!!



by:

This is the second etrailer hitch that I have installed. The how-to videos were extremely helpful. They have really gotten it down to a science and made the process very easy to follow.



by:
Subaru

We have been ordering trailer hitches from you for 10 years. Our business is Bradley car care and this was my own new Subaru and it works great. My third hitch from you. Thank you so much for what you do for our business.



by:

Curt T-Connector was the easiest trailer wiring harness to install. The instructions were perfect and so easy to follow. Very, very good product at a most reasonable price.



by:
2023 Subaru Ascent

Still have yet to test it out but it seemed to plug in fine. I didn't like the method of pinching the cable on the rear hatch when in use since I wanted to keep the harness mounted on the hitch at all times so I referred to a different install video that showed me how to run the wires through a grommet in the rear of the vehicle.



by:
2022 Subaru Forester

Installing this harness could not have been easier. This is a plug-in unit and the installation video was excellent, though I didn't feel the need to take the long strip over the lock off. I installed it coming through the hatch. It would have taken a lot less time if my lady friend hadn't been texting me.



by:

I am very pleased with the results. It went a lot faster once the wiring connector at the left tail light was located. It would have saves a lot of time and frustration if a picture could
be included With an arrow pointing to the correct connection. It also would have helped a lot if I had ordered the correct kit but to start with, but they were excellent in sending the correct kit and refunding for the first one.



by:

Products were top quality! The installation went very well, primarily from me watching the video on the product listing. The video was clear and MUCH better than the written directions. I get all of my trailer needs from etrailer, past, present, and future! Tammie from customer service was great, checking in and making sure everything was perfect on my order! Thanks!



by:

This was easy to install. Instructions were straightforward. I like that it’s stored inside the car out of the way with the spare tire when not being used



by:
2024 Subaru Outback Wagon

Great product quality. Like the hitch I purchased from Etrailer great quality at a good price. The dealer wanted $250 for this $35 product. The videos on how to install are great!



by:
2015 Subaru Forester

This is the second trailer hitch and wire harness I've bought from etrailer and I am beyond satisfied! They leave no stone unturned for instructions and customer service. The video tutorials and the products are fantastic. I will never go anywhere else for trailer hitch and accessories.



by:
2022 Subaru Forester

It is a really great hitch. And the installation was pretty easy. It only took me about an hour and a good part of that time was spent removing and installing the exhaust system and the worst part was the dust / dirt cover on the driver side of car.

I also bought and installed the trailer wiring harness pigtale . It was very easy once I located the connector on the car. That was hard to find because was not in the normal place for a Forester.



by:
Subaru Outback Wagon

Hitch fit perfectly on our 2022 Subaru Outback. Pretty straightforward installation. Shipping was fast once order placed.



by:
2023 Subaru Outback Wagon

Like the product eliminates cutting and splicing factory wiring. Wish I had the instructions and or video for the 2023 Outback included with the harness. It would have saved me a couple hrs labor



by:
Subaru Forester

Matched my utility trailer and 2023 Subaru Forester and was easy to install.



by:
Subaru XV Crosstrek

Great service and perfect addition to my new Crosstrek Wilderness, harness says 2020 but it works with 2024 according to Curt.



by:
2017 Subaru Outback Wagon

5 stars for the wiring harness which works just fine in my 2017 Subaru Outback Wagon. The install took some time though (more than it took to install a Curt hitch) because it was hard to locate and expose the car's wiring connector. Would give the install a 3 star for that. The harness instructions have pictures showing where to find that connector behind a panel covering the left rear wheel well. But you don't know exactly where behind that panel, and it's a tight squeeze getting your hand & forearm in there to find it. A small mirror helped. The harness is looped back on itself so you won't see the connector, look for the loop and maybe some blue tape which holds the loop. It's finding that loop that took the time.
I routed the harness out through a rubber plug in the spare tire well. It's easy & much neater than running it under the tailgate when you're towing. Remove the rubber plug, slice it from the center to one edge so you can get the wiring harness into it. Figure out how long a wire you need outside the car, reinstall the plug, and seal around the wire with 100% silicone caulk.
I connected the grounding wire to an existing bolt inside the car (just secure with a second nut) rather than drilling a new screw hole.

Charles

3/17/2019

No issues at all, works as it should.



by:
Subaru

This is the second hitch assembly for my Subaru outbacks (2023-2024) very easy installation, Very little trimming needed. Easy removal of rear bumper cover then quick replacement of bumper bar assy to trailer hitch assy. Very fast service with free shipping.



by:
2022 Subaru Outback Wagon

Ordering was simple and accurate. Instructions were very easy to follow for installation. Thank you for great service and care!



by:
Subaru

Plugged right in. It was a little tricky getting access, but thats because Subaru used a few plastic retainers that were tricky. I did need a thread tapper and bolt to ground the thing, but otherwise it was cake.



by:
2021 Subaru Crosstrek

Package arrived on time and undamaged. I have not actually installed it yet but I see no reason why the install won't go smoothly.



by:
2014 Subaru Outback Wagon

Easiest tail light converter that I've ever put on a vehicle Everything went perfect


25
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Show More Reviews

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

  • Trailer Wiring Recommendation for 2019 Subaru Crosstrek
    The best 4-way trailer wiring harness we have for your 2019 Subaru Crosstrek is the Curt # C56040 mainly because of the quality and reliability of the converter box. It has the highest amperage rating of all of the options which allows it to be the most resilient against trailer wiring shorts. The two circuits of this are rated at 3 and 6 amps whereas the Tekonsha is rated for 2.1 and 5.6 amps.
    view full answer...
  • Troubleshooting Running Light Not Working On 2011 Subaru Outback Trailer Connection
    It sounds as though there may be a damaged pin connector in the wiring. I recommend going to the connector on the 2011 Subaru Outback where the Curt T-Connector Vehicle Wiring Harness # C56040 connects. Pull apart this connection and check to ensure that all he pins on the harness are securely in place. You can also check the voltage coming into the connector to ensure that there is not something wrong with the fuses or wiring on your Outback.
    view full answer...
  • Install Video Guide for Trailer Wiring In a 2016 Subaru Crosstrek
    Since the Curt harness part # C56040 that you have for your 2016 Subaru Crosstrek is a fit for a few different models of Subarus we have found that the connector instructions in the install instructions aren't always accurate. The video I attached shows where you will find the connector. It will be behind the driver seat.
    view full answer...
  • Where Does Trailer Wiring Connect on 2019 Subaru Ascent
    The connector you are looking for to install the Curt trailer wiring kit part # C56040 on your 2019 Subaru Ascent is located behind the driver side rear panel in the cargo area. If you check out the picture I attached you'll see where to find it.
    view full answer...
    Image 1 for
  • 4-Way Wiring Harness Compatibility From a 2008 Subaru Outback To a 2018 Subaru Outback
    There is not an adapter that will allow you to transfer your Curt harness from your 2008 Subaru Outback to your new 2018 Subaru Outback. You will need a Curt T-Connector Vehicle Wiring Harness # C56040 for your new Outback. This will plug into your factory connection to give you the 4-way flat trailer connector. I have linked a video below that will walk you through the installation process.
    view full answer...
  • Does Curt Trailer Wiring Harness part # C56040 Fit 2018 Subaru Crosstrek
    Yes, we have confirmed that the Curt wiring harness part # C56040 that you referenced is a confirmed fit for your 2018 Subaru Crosstrek and would work well. I attached an install video for this wiring harness on a similar 2017 Crosstrek like yours.
    view full answer...
  • Is There a Back-Up Sensor Plug on Curt Harness for 2018 Subaru Outback
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56040 uses a solo connector which in under the rear cargo tray and carries the functions for the lighting circuits. There is no connector used for back-up sensors. If you have back-up sensors, they will still work as normal although there would likely be warning messages when you back up with the trailer attached. The only harness that I am aware of that ties into the back-up sensors and turns them off...
    view full answer...
  • Location Of The Connecting Harness For Curt T-Connector With 4-Pole On 2017 Subaru Outback Wagon
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # C56040, plugs in with a simple connection in the rear of your 2017 Subaru Outback. Unfortunately, according to my tech contact at Curt, Subaru has not been consistant with where this plug is located. He said they have found them anywhere behind the rear seat to under the carpet near the spare tire, to even taped to the wires behind the tail light. The harness is consistent, but the location isn't other...
    view full answer...
  • Does the Curt T-Connector Vehicle Wiring Disable the Auto Engine Stop on my 2020 Subaru Outback
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56040 is a passive system and it will not deactivate any of the features of your 2020 Subaru Outback. It is very easy to install check out the video I linked my buddy Rob did on the wiring and a 2020 Outback like yours.
    view full answer...
  • Trailer Wiring Harness Location On 2014 Subaru Forester
    I looked at the installation instructions for your 2014 Subaru Forester and found that the wiring harness is located behind the rear panel on the driver side. The location is very similar to the Crosstrek in the attached video. The video explains how to remove the cargo tray and the panel to access the harness. I have also attached a couple of photos that show the location of the harness per the installation instructions.
    view full answer...
    Image 1 for Image 2 for
  • 4-Way Trailer Wiring Harnes For 2024 Subaru Ascent
    I verified for you the correct 4-way trailer wiring harness for your 2024 Subaru Ascent is the following: - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56040
    view full answer...
  • Does Trailer Wiring Harness C56040 Require a Wire to be Run to the Battery on a 2012 Subaru Forester
    The red wire battery connection is within the factory plug where trailer wiring harness # C56040 plugs into your 2012 Subaru Forester. So you would not have to run a wire manually since the factory wiring already has that connection. Just remember to insert the fuse in the red fuse holder that is in line on the red wire of the wiring harness. The fuse is included.
    view full answer...
  • Where Does the Fuse Install on the Curt Custom Wiring # C56040 for 2013 Subaru XV Crosstrek
    The 10 amp fuse in the Curt Custom Wiring Kit # C56040 for your 2013 Subaru XV Crosstrek is inserted into the red fuse holder that is located on the red wire in between the white plug and the black converter box. In the picture attached I have the insertion point noted. I have also attached a brief installation video of this harness on your model vehicle.
    view full answer...
    Image 1 for
  • 4-Way Trailer Wiring For 2024 Subaru Ascent
    I can indeed tell you what 4-way trailer wiring harness you need for your 2024 Subaru Ascent. I verified directly with the manufacturer for you that the correct part number is the following: - Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56040
    view full answer...
  • Location of OEM Wiring Connector on 2017 Subaru Outback Wagon
    Thank you for your purchase of Curt 4-Pole Wiring Harness kit # C56040 which is a confirmed fit on your 2017 Subaru Outback Wagon (excluding the Sport Edition). We had the chance to install this harness for a local customer and the linked video shows the installation process. Our technician located the white plastic OEM connector behind the carpet in the front/left corner of the cargo area as shown in the video at the 3:40 mark. Please check your owner's manual starting on page 6-15 for...
    view full answer...
  • Locating Connector for Installation of Curt Custom Fit Vehicle Wiring # C56040 in 2014 Forester
    I verified with Curt that the trailer wiring harness you referenced, part # C56040, is indeed the correct fit for a 2014 Subaru Forester. It has happened that Subaru has changed the location for their vehicle's connectors. It is possible you are looking at a different connector. If the plug is not located on the driver side of the cargo area beneath everything then it could be forward of that location, meaning you would need to loosen if not remove some of the side trim panels to gain...
    view full answer...
  • Does the Curt Harness for a 2020 Subaru Forester Come with Written Instructions
    Yes, the Curt T-Connector Vehicle Wiring Harness part # C56040 which is a fit for a 2020 Subaru Forester will come with a set of written installation instructions which I have also attached for you below as well. Furthermore, Curt harness has really great written instructions especially when compared to other options like from Tekonsha so they are very easy to follow.
    view full answer...
  • Installation of Curt # C56040 Trailer Wiring Harness on 2014 Subaru Forester
    We do indeed have an install video showing the Curt # C56040 trailer wiring harness being installed on a 2014 Subaru Forester. The linked instructions show the location of the connector that the wiring harness plugs into. Once you locate the connector, the installation is pretty straightforward. Plug the converter into the connector and ground the white wire using an existing factory ground if one is available, or use the included self-tapping screw to attach the ground wire to the vehicle...
    view full answer...
    Image 1 for
  • What Wiring Harness To Use On A 2014 Subaru Forester
    My contact at Curt told me that the wiring harness for your 2014 Subaru Forester is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56040. This hardwire kit comes with everything you need to properly hook up your wiring, including a circuit tester. I have attached the instruction manual for your review as well as a short article about routing the power wire for a trailer harness. I attached the article because this step can be daunting to novice installers...
    view full answer...
  • Does Curt Wiring Harness C56040 Fit all Models of the 2016 Subaru Forester
    Your 2016 Subaru Forester has the needed wiring harness to allow the Curt Trailer Connector part # C56040 to install and provide you with a 4-way for trailer wiring. Your vehicle would not need to have a towing package. I attached an install video for you to check out as well. This fit all models of the 2016 Forester
    view full answer...
  • Can Trailer Wiring be Routed Outside of 2014 Subaru XV Crosstrek Instead of Hanging Out the Hatch
    There could be a way to route a trailer wiring harness through the bottom of the cargo area and out on your 2014 Subaru XV Crosstrek. You will need to remove all the flooring that you can in the cargo area of the vehicle to get down to the metal. Then look for a grommet that you could route the wiring through. If there is no grommet you would have to drill. The weather stripping on the vehicle hatch will protect the harness wires provided the hatch is not closed on the harness. The wiring...
    view full answer...
  • Snowmobile Trailer Running Lights Stop Working, Other Lights Fine, Towed with 2013 Subaru Outback
    This sound like a bad ground. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal...
    view full answer...
  • Does the Battery Have To Be Unhooked To Install Curt Harness On 2019 Subaru Forester
    According to Curt, the installation of the Curt T-Connector Vehicle Wiring Harness part # C56040 which is a fit for a 2019 Subaru Forester will require that the negative battery terminal be removed before starting. That said, I have installed several of these without issue and I can't say I have ever done this but I also can't recommend you go against the instructions from the manufacturer so I will leave this up to you to decide.
    view full answer...
  • Will Curt T-Connector Wiring Harness C56040 Provide Power Supply To Trailer
    The Curt T-Connector Vehicle Wiring Harness # C56040 will provide brake, tail, and left and right turn lights to a trailer with a 4-way flat connector. This wiring harness will not provide your trailer with a power supply. The harness requires a power supply because of the taillight converter built into the harness. The converter works to match the Subaru Forester's separate lighting with the trailer connector's combined lighting. I have attached an installation video of this wiring...
    view full answer...


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