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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
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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 800-298-8924 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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  • Reviews (913)
  • Q & A (187)
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Curt Custom Fit Vehicle Wiring - C56040

  • 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. 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 Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (913 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:

Was easy to install and I'm glad I listened to the video and didnt try to run the wiring to the lower panel. It was pretty simple to install. 576269



- C56040
by:

Product is as advertised and etrailer did a solid job explaining installation options. I like the option to store the wire inside the vehicle since it will be used sparingly. 778962



- C56040
by:

Wiring kit installed in minutes. Worked first time I tested it then after putting everything in place, it wouldn't work. It turned out to be a bad connection in the plug in my car, not this harness. The kit has everything needed for installation and includes a long cable on the flat 4 plug end. Very easy to store the flat 4 plug inside the car except when using it, just as described in the video. Thanks etrailer!!!! 198683


Comments
The installation was as easy as the on line video suggested. I was very pleasantly surprised it went as well as in the video! This clearly was developed with some thought. Both items were extremely easy to install and have been working fine since installation. Whenever I need anything for my vehicle or camper in the future, I most definitely will go immediately to your webpage.Thank you for quality products at a great price. I have to tell you, this follow-up email just made my day! Thanks for thinking of me............Just another really satisfied customer
John - 06/18/2016

18789

- C56040
by:
2013 Subaru XV Crosstrek

The instructions for the electrical connector were missing the details for the XV Crosstrek. So after taking off most of the panels at the back of the car, I called the tech support number and he suggested to look under the kick plate at the very back of the car. After removing the back panel, the plug was easily found on the drivers side against the back wall of the car. Since this is a new model for 2013, I assume the instructions will be updated shortly. 66859


Comments
White connector is under hatch kick plate , Left of center of rear spare tire compartment. . It is tape to a plastic wire hold down. pop out hold down remove tape there you go. Hard to see and feel with finger tips. remember its at the back of vehicle hatch opening kick plate. NOT UP BY SEATS . GOOD LUCK 2013 crosstrek.
-- comment by: Carl - 05/18/2013

1517

Thank you for the additional info.

-- Patrick B - 5/20/2013

Comments
Im still having a bit of trouble with the kick plate removal on my Crosstrek. Just to make sure were talking about the same piece... Im assuming the kick plate is the piece that runs across the bottom of the hatch opening that the hatch latch pokes through. It has two button fasteners which Ive removed but the panel still seems to be firmly attached. It appears to snap in but Im a little leery of pulling too hard and breaking it. Is there a trick to its removal?
-- comment by: John R - 07/31/2013

1834

There are little retention tabs on the underside of the panel that help to hold it in place. Once you remove the push rivets, gently and firmly pull up on the panel. Check out our install video on the 2013 Crosstrek to see it in action. There are a couple of video links below the main photo.

-- Patrick B - 8/5/2013

Comments
Have wire harness for my new 2014 Subaru Forester. Can not find connector in vehicle. Comment below said it is located just left of center at the rear under the hatch kick plate Have no idea what the hatcdh kick plate is : I have used fingers, mirror and flashlight. HELP!! Thanks
-- comment by: Dick G - 08/01/2013

1842

The kick plate is right at the threshold, the long piece of plastic covering that goes along the cargo area where the latch is. Check out the link to the video on the Crosstrek to see removal of the kick plate.

-- Patrick B - 8/5/2013

Comments
plastic wire hold down in his kick plate sounds like the metal cargo tie in, which has a plastic bezel, in the side panel of my 2014 Forester. I need to remove this in order to access the connector. Seems like Carlo was able to pop his out, which I have not been able to do. Mine has a metal tab poking through the back attachment bracket that could be a release, but so far I have not been able to make it move. Any suggestions.
-- comment by: Ed V - 10/07/2013

2153

Send me a photo of the tab if you can. I have a feeling it is just a spring tab that helps hold by tension and firmly pulling on it or slightly squeezing and pulling will get it to release. But to make sure, it would help to see pictures first in case it is something other that what I think it is.

-- Patrick B - 10/10/2013

Comments
All is good with the trailer hitch and wiring harness. Thanks to the folks at etrailer we were able to quickly resolve the instructions for the Subaru XV wiring harness. Being a brand new model last year, it was not unexpected that there would be some growing pains with the installation instructions.I have recommended your company to several of my friends who are looking for trailer hitches.
-- comment by: dave - 02/18/2014

2855
Comments
I just installed this wiring kit on my 2014 Subaru Outback. The installation was very straightforward. The connector plug was hidden at the spot that the instructions suggested. I dont think I would have found it without the guide.I ordered the product at 10:00 pm on 317 and received it on 3/20. E-trailer provided emails to confirm the order and shipment.Thanks e-Trailer for great service!
-- comment by: Keith - 03/23/2014

3225

Thanks for the feedback, glad to know the harness installed with relative ease. Give us a shout if you ever have any questions.

-- Patrick B - 3/27/2014

Comments
Just purchased new 2015 Subaru Forester Im installing hitch and wire harness by myself . Video instruction is absolutely great .Thank you for making my life easier
-- comment by: George Z - 09/01/2014

6596

- C56040
by:
Ford Edge

With the factory connector installation was a breeze! The hole and plug that the wires exit the vehicle to go to the hitch was on top of a heat shield that had sharp edges, so I used 3/8" plastic split-loom to protect the wiring all the way from the hole to the 4-pin connector. In order to keep the factory rubber plug, I used a utility knife to cut a slit from the center of the plug straight out to the edge of the plug, and then cut a tiny area out of the center of the plug. This let me slide the plug onto the wires and place it right back into its hole. 130770



- C56040
by:
2016 Subaru Outback Wagon

This is a follow up on my previous review (the one with the cat in the picture). This is an EXTREMELY simple installation in your 2016 Subaru Outback. Except for the part about finding the OEM plug under the side panel. The etrailer video is very accurate, especially the more recent one that's about 7 minutes long. The hard part is getting your hand up in there far enough to reach the plug. This depends on the size of your hand! In my case, it wasn't until I had help to hold the side panel out while I stuck my hand in there was I able to get it done. I also used a putty knife to pry up the little lip of the side panel over the black plastic trim that is located right beneath the tie-down ring. That gave us enough slack to pull the panel out. The side panel did not suffer any damage by this procedure. There are also insulation pieces in the way, so if you get discouraged keep pushing. It's up there. I actually pulled some of the little squares of insulation out just because (frustration while I was waiting for my help to arrive), but they are easy to stuff back in when you're done. You shouldn't have to do that. While you're hunting, keep in mind that it is really close to the tie-down ring, about 3-4 inches, and it is up high, about the same level as the top of the ring enclosure. Once you feel it, you will know it. There's nothing in there to get your fingers confused. Give it a good pull. There's not much slack, it will only come out far enough to plug in and push it back under. It was plug and play and my trailer lights worked perfectly with no problem. I've been a big fan of etrailer for at least 10 years, and once again they did not disappoint. 453108



- C56040
by:
2013 Mazda 3

After installing a Modulite protector on my Mazda 3, I have to say this install was a BREEZE... Imagine an actual plug that you just plug in... WOW, what a mind blower! He He. The product easily installs under the drivers side, rear kick plate. On our 2013, the trailer wiring plug is right at the back of the car. You just have to pull off the hatch trim panel to get to it. Running the extra ground wire is no big deal. I drilled a hole, sanded off the paint around it. screwed down the round flat connector with the provided machine screw, and put some RTV on top of it to prevent rust. 94363


Comments
They both worked great, thank you for the follow up!
Mark F - 02/20/2015

9643

- C56040
by:
2015 Subaru Forester

Ordering, receiving and installing this trailer light connector was easy and without any issues. This was a replacement for one in use only 18 months before failing. If this one fails in a similar time frame, I will try another brand. Hopefully, the first was a fluke and I get several years service out of this one. 587703


Comments
The failure of a trailer taillight converter is typically caused by a wiring problem somewhere on the trailer that leads to a short circuit which ultimately damages the taillight converter. After replacing the damaged wiring harness, be sure to thoroughly check the wiring on the trailer. Begin at the trailer connector, and follow each circuit back to its lamps. Look for pinched wires, loose connections or cracked/worn wire insulation that would allow the wire to short out on the trailer frame. If the short isnt located and repaired, youll continue to blow out taillight converter harnesses. Ive linked to a couple of help articles that should provide some assistance.
-- Mike L - 12/01/2018

46283

- 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. 483150


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

50645

- C56040
by:
2017 Subaru XV Crosstrek

Installing this powered trailer lighting adapter was pretty easy, the most difficult part being removal of the trim panels. If you haven't done this sort of thing before you'll find that an inexpensive set of trim removal tools will be a significant help. Subaru did the wiring job properly - contrary to what I expected you don't have to run a hot wire to the battery, a hot is already present at the connector - and the actual hookup is pretty easy. The assembler who secured the connector pigtail at the factory was perhaps overly enthusiastic with the electrical tape so a sharp knife and some careful dissection was required to avoid damaging any wires. While the instructions suggest drilling a hole and using the included self-tapping screw for the ground wire, on my 2017 Crosstrek that wasn't necessary as Subaru has thoughtfully provided a tapped hole for an M6 screw in the perfect location. I used an M6-100 hex head bolt with both a flat washer and a lock washer. 430177



- C56040
by:
2011 Subaru Outback Wagon

Here's some pics, rather than drill into the floor I used the larger eyelet and a grounding washer and used the strut nut. Went well ! 528134



- C56040
by:
2019 Subaru Outback Wagon

Harness was perfect for my 2019 Outback. The instructions that are available on etrailer and come with the harness which did a great job of giving me the general location of the connector. Took me a little while to fish it out as Subaru had it tucked up in the trim very well. Once I had it out and visible the remainder of the installation was a snap. I did vary from the instructions however and ran the harness through one of the rubber plugs at the bottom of the spare tire well. This allowed for a very clean, permanent installation using a bracket attached to the hitch as the picture shows. 568307



- C56040
by:

Hardest part of the install was getting all my stuff out of the trunk! 892580



- C56040
by:
2020 Subaru Outback Wagon

This tied directly into my 2020 Subaru Outback- no issues. I then clipped it into the 7 pin harness (required that I splice the 12v supply) and now I have both a 7 pin and 4 pin on the back of my Outback! 884290



- C56040
by:

Easy install after locating plug behind drivers side rear fender trim. 882617



- C56040
by:

Again super easy install just follow videos. Amazing!!! 882067



- C56040
by:
2017 Subaru Outback Wagon

Worked well with no issues. Needed to remove the cargo hook to get to the Subaru plug. Drilled the hole for the ground in the area surrounding the shock mounting bolt 881625



- C56040
by:

881348



- C56040
by:

881196



- C56040
by:

Very happy with the product and it was super easy to install using the instruction video provided on your website. 880274



- C56040
by:
2020 Subaru Crosstrek

877468



- C56040
by:

Product is great. This harness saved me a lot of time. Just plug it in and let her fly. 876994



- C56040
by:

876973



- C56040
by:

Good looking, easy to install, video online and works great! 876522



- C56040
by: 09/09/2020

876056


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  • Why Store the Trailer Wiring of a 2016 Subaru Forester on the Inside of It
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  • Comparing Curt C56040 and Tow Ready 118467 Wiring Harnesses for 2016 Subaru Forester
    Both the Curt # C56040 and Tow Ready # 118467 4-pole trailer wiring harnesses that fit your 2016 Subaru Forester will install by plugging in to a vehicle connector. This is located in the rear of the vehicle on the driver's side as shown in the linked video at the 2:15 mark. The Tow Ready harness installation will be slightly quicker since it has no separate ground wire to install. There is a notable difference between these two products. The Curt harness can deliver higher current output...
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  • Trailer Turn Signals and Brake Lights Not Working when Connected to a 2013 Ram 1500
    Like you have said, the 2013 Ram 1500, if so-equipped, will have both a 7-Way and a 4-Way trailer connector at the back. In order to determine where the problem is you will need to use a circuit tester, # 40376, if you do not already have one. Have some one sit in the truck and go through the light functions while you test the 4-Way with the circuit tester. If everything works on the truck side then that indicates a problem on the trailer. If the same problem exists on the truck side...
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  • Troubleshooting Wiring Harness On 2015 Subaru Forester When Trailer Lights Do Not Work
    Before you replace the OEM harness on your Forester you may want to check a few things. First, check the fuse for the trailer connector in the passenger compartment fuse panel. From my research the trailer connector fuse is in the number 1 slot. You may find that you have a blown fuse and that is why the harnesses you have installed do not work. If the fuses all check out okay, I recommend using a circuit tester like part # 40376 and have someone run through the functions while you test...
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  • 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...
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  • Recommended Trailer Hitch Receiver, Wiring, And Ball Mount For 2010 Subaru Outback 2.5i
    For your 2010 Subaru Outback, you can trade out your factory hitch without any compromising issues for the Curt Trailer Hitch Receiver Class III - 2", # 13390, which is a confirmed fit for you vehicle. Your heat shield must be modified or trimmed for this installation. Your vehicle has a towing capacity of 2700 lbs according to the online version of your owners manual so you will be able to tow a tear trailer as long as the tongue weight doesn't exceed 200 lbs which is your vehicle limit,...
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