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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

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Custom Fit Vehicle Wiring

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Curt Custom Fit Vehicle Wiring - C56040
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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. Call 800-298-1624 to order Curt custom fit vehicle wiring part number C56040 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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Curt Custom Fit Vehicle Wiring

  • 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

Item # C56040

Installation Details C56040 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (1305 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.

- C56040
by:
2020 Subaru Outback Wagon

Easy installation. For the 2020 Outback, instructions were wrong about location of connection. Subaru moved the harness connection to the passenger's side, against the rear of the space for the spare tire. See Image.


Comments
Works great.
John F - 07/25/2021


- C56040
by:
2021 Subaru Forester

The placement of the connector in the back of the Subaru Forester allowed me to plug in the wiring harness and let the excess cable, box, and fuse sit in the back tray of the forester. I grounded the harness to a nearby bolt and bracket. I feed the wire out of the back of the hatch when needed.



- C56040
by:
2012 Subaru Forester

Harness was easy to install but does take a bit longer than stated. I’m pretty good with DIY electrical and mechanical. It took me about an hour to figure the route and placement of the power conditioner so everything would go back nice and secure. See pics. This is for 2012 Subaru Forester.



- C56040
by:
2017 Subaru Outback Wagon

Just received my trailer wiring harness, watched the etrailer video for installation and installed it. Took about one hour start to finish. It's going to do the trick. You guys are great with customer service and shipping notifications, I will gladly order stuff from you again. Thank you for your level of service, it was literally best online order experience I have ever had.


Comments
Its still working well.
Peter - 07/23/2021


- C56040
by:

Great. Big thanks for your installation video. I followed along and everything went as he showed. Perfect. Took under an hour. Also, the Curt package had all the needed parts for installing. Thanks again.



- C56040
by:
2017 Subaru Forester

The Curt Receiver Hitch custom fit for our 2017 Subaru Forester is exactly what I? was hoping for. We wanted a receiver to continue to use the bike rack from a prior vehicle. Our prior hitch bar hung below the vehicle reducing ground clearance and often scraped the ground at inclined entries to parking areas or driveways. This custom fit hitch bar is completely inside the bumper, and has no impact on clearance. Perfect!


Comments
After a year, we used the hitch more than anticipated. Weve towed a few rental trailers to move things to colleges, and just bought a cargo rack that accommodates a few large bins to add more cargo volume. Fantastic!
Alan - 06/19/2021


- C56040
by:
Subaru Outback Wagon

The Curt connector fit perfectly. The 2021 Outback factory trailer connector the Curt harness connects to is located in the spare tire compartment at the back top toward the passenger side. Only the spare tire compartment needs to be accessed. No other panels need to be removed!!!!



- C56040
by:
Subaru Outback Wagon

The instructions here were "ok", not great. I took out all the floor in the trunk of my Subaru Outback (2012) and turns out half of it could have stayed in. The wire harness on the car is hard to find, Subaru thing, I suppose they figure most people aren't going to hook up trailers. Overall, took about 30 minutes to complete this part of the job. About 90 to do the hitch. First timer here. Still pretty simple. The instructions also do not tell you where to run the end that goes to the trailer. I found a round black rubber plug that goes out the bottom under the spare tire. Run the wire there to the hitch and stuff the plug back in there and tape it down. And done! :)


Comments
Everything works as desired
Joshua - 05/19/2021


- C56040
by:
2017 Subaru Forester

Hitch was delivered fairly quickly but as others had experienced I had damaged packaging and needed to spray a little Rustoleum on it in a few places. I was able to follow the instructions that came with the product and did not have to enlarge any hole in the frame to fish the spacers and bolts as in the video. The video was very helpful though and I recommend watching it. I did remove the muffler and that made it much easier. I had the help of a friend with better tools than mine and it took us about an hour. This was installed on my 2017 Forester Premium. Would have given five stars if not for having to touch it up. I also installed the Curt C56040 wiring harness on my own and it went smoothly and exactly as in the video.



- C56040
by:

Excellent service from the trailer wiring harness assembly I ordered and installed. Installation was relatively straight-forward; no issues with it whatsoever/ highly recommended !


Comments
It has been faultlesshighly recommended
Dale S - 06/24/2021


- C56040
by:

Between the video and the instructions that come with this it is a breeze to install this wiring harness in your Subaru Outback with no splicing no cutting of wires. This is an excellent product took only minutes to install


Comments
One year later and youd never know I had a hard time finding the correct connection on my car. The trailer wiring once installed is all hidden you dont even know its there until you need it. My particular vehicle it took me a few moments to locate the connection but once I found it it was very simply installed. Excellent product
Richard - 06/29/2021


- C56040
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.


Comments
No issues at all, works as it should.
Charles - 03/17/2019



- C56040
by:

Great kit, quality wiring and connectors. It caught my eye Pigtail is right at the lower left rear quarter interior trim, no need to pull that out.



- C56040
by:
2017 Subaru Outback Wagon

nice clean install. its an easy plug in installation but finding the connector was the trick. Would have never been able to do it without the video for my 2017 outback. True to video it was where they said. Since it is out of sight and you just have fish around under the panel to snag it.


Comments
Works great. No issues. Id buy it again
Doug R - 05/24/2021


- C56040
by:
2016 Subaru Crosstrek

Easy set up and looks great on my 16 Cr osstrek



- C56040
by:

The vehicle wiring harness works great. It was easy to install and easily connects to the trailer's connector.



- C56040
by:
2020 Subaru Outback Wagon

I have used etrailer for all my hitches on my Subarus over the years and have had nothing but good success with etrailer and the products they sell. I just recieved a Curt T-Connector wiring harness for my newest 2020 Subaru Outback (have already put the etrailer-Curt hitch on it) in record time. Like 2 days! Also all the support videos showing how to put everything on is "spot on" and very helpful. Keep up the good work etrailer, I'm sure I will buy again.



- C56040
by:

Installation instructions- especially the videos- were straightforward and easy to follow. Installation was simple.



- C56040
by:

Easy install and great installation videos on etrailer.com


Comments
It was easy to install and has worked perfectly.
Iain G - 07/20/2021


- C56040
by:

Got the hitch and it is installed. You directions were exceptional. The attached photo shows the wire connector at the rear of the 2020 Subaru Outback. The connector is just a little toward the passenger side of the vehicle from the back gate latch. It was not in the side panel as described on internet posts. Thought you might like to know.



- C56040
by:
2017 Subaru Outback Wagon

Looks better than the factory hitch. Straight forward installiation. Did not need to bend the center tab flat as the directions state. Not doing so gives you another point of attachment for bumper cover. Very well built.



- C56040
by:

Absolutely no troubles after a year of use. Initial installation was a breeze with the detailed, auto specific instructions provided at purchase. Easy to plug and play, so setting up trailer lights is a snap. If only loading and unloading the trailer were that easy.



- C56040
by:

Everything fit perfect, very easily put together with the subaru wiring. Have told other people about my experience with etrailer not only with wiring harnes but with my past purchases also. Very pleased with everything.


Comments
Everything has been working great with the wiring harness, No problems at all.
Pastor B - 04/01/2021


- C56040
by:

Another great experience. Quality products and wonderful service at a reasonable price. Installed in less than 40 min! Required enlarging the center frame rail opening would be great if kit came with a hole saw for that but oh well.



- C56040
by:
2018 Subaru Forester

This hitch was relatively simple to install. It is helpful to have two people during the actual lifting and bolting of the hitch. A die grinder is a useful tool for enlarging the middle hole in the frame. Also, the heat shield for the muffler can be reinstalled by simply cutting away clearance for two hitch mounting bolts (a template from the manufacturer would be a nice addition to assist with this).


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Ask the Experts about this Curt Custom Fit Vehicle Wiring

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    We do have everything you need to install a 7-Way on your 2020 Subaru Outback Wagon so you can utilize a brake controller but we need to start off by making sure you have a 4-Way for the basic trailer lighting functions. If you don't already have one I recommend the Curt T-Connector # C56040 because it has the highest amp capacity and comes with a 1-year warranty. Next I recommend installing the 7-Way RV Upgrade Kit # ETBC7L which plugs into the T-Connector and then you route the power...
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    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.
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    We haven't had the chance to install a brake controller on a 2020 Subaru Outback Wagon so I can't tell you offhand what the color of wire you need to use but I can still help you figure it out. For probing wires with limited access the best option is a circuit tester like the # PTW2993 which uses a hook/probe setup that's easy to get into limited access areas. With a tester like this you'll be able to determine.
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    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.
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  • 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...
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  • Will Curt # C56040 T-Connector Operate Trailer Brakes
    The Curt # C56040 T-connector will plug into the connector in the cargo area of your 2016 Outback, and provide right turn, left turn running lamp and brake light signals for a trailer. The harness will not operate or actuate electric trailer brakes. In order to do that, you'll need some other items in addition to the C56040 harness. If the trailer has electric brakes, you'll need to install a brake controller and a 7-way trailer connector onto your Outback. I'd recommend a proportional...
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  • All Trailer Lights Come On when Connected to 2017 Subaru Forester with Curt Wiring Harness
    With the trailer disconnected from your 2017 Subaru Forester use a circuit tester such as # 40376 or a meter if you have one to test the 4-Way trailer wiring harness # C56040. Have someone sit in the vehicle to operate the lights. First turn the headlights on. Then test the pins on the 4-Way. If more than one pin has power then that indicates a short inside the converter box and the whole harness will need to be replaced. I suspect that this is the issue but if not there are other tests....
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  • 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...
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  • Recommended Trailer Wiring Harness for 2014 Subaru Outback Wagon
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  • 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...
    view full answer...

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