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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 # C56011
Our Price: $36.11
You Save: 46%
Custom Fit Vehicle Wiring

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Shipping Weight: 0.87 lbs
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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 - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56011 or order online at 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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CURT Custom Fit Vehicle Wiring - C56011

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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 - no cutting, splicing or tapping required. Converter 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 - no cutting or splicing of wires
    • Locate connection points in rear cargo area
    • Plug in T-connector
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
  • 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 amps per circuit
    • Tail lights: 6 amps per circuit
  • 1-Year limited 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 interior trim panels in your rear cargo area.

Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location within your cargo area.

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.

Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. 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.

56011 CURT T-Connector - Surface Mount Technology - 4 Wire

Compare to Tekonsha 118596

Installation Details C56011 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 - C56011

Average Customer Rating:  4.8 out of 5 stars   (480 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 - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance.


This harness did not fit the vehicle (2018 Fiat 124 Spider) it was recomended for. The part was recomended by but did not fit. See picture of packaging, It should have been pretty obviouse this was not going to fit. To return it they wanted to charge me almost $xx. Caution ordering from this web site, if they recomend it and it doesn't fit you are going to pay shipping to return it.

Etrailer Expert

Katrina D.


I am sorry to hear that this harness did not fit your 124 Spider. I do see that we do not carry anything on our site that will work on your vehicle. I am not sure how this harness even came into your search, but I will definitely make sure that this mistake will not happen again. As for finding a harness that will work, I would highly recommend contacting Fiat to see if they have a harness that they would recommend.

2015 Mazda CX-5

I am quite happy with this wiring kit! It truly is plug and play!!
After watching the video, the install was quick and easy.
I only deviated from the install video, where it concerns the ground wire.
It says to use a drill and make a 3/32 hole and use the self tapping screw, if you can not find an existing place to mount the ground wire.
On the CX-5 there is a perfectly placed nut that can be used, and you dont even need any extra tools above what the kit calls for.
When you pull off the plugs for the drivers side tail lights, you will also see 3 10mm nuts that hold the tail light in place.
Just remove the one below the brake light, and slip the ground wire over it and replace the nut.

Tim W.


I havent had to pull any more trailers, but I have no doubt it will work just fine, the next time I need to unroll it from the spare tire well!


Wiring was easy, aside from some inevitable tight quarters gaining access to the rear of the taillights to connect everything.


Seems to be high quality and perfect fit. I have hauled a few things with it, no problem. My advice is to just fully remove the muffler instead of dropping it. If you are installing it in your driveway like I did. It was very difficult to get leverage to squeeze it into place, but once I pulled the muffler, easy.

2015 Mazda CX-5

Super easy to install. Still need to test it with a trailer though.


Fit my car application and fast shipping. Thanks!


Works great! Detailed instructions.


Great product, does what it says. Instructions were very generic and poorly written, and omitted a critical step - connecting the second in-line plug on the driver side for the running lights. Apart from that the install was very easy. The supplied adhesive mounting pad for the converter would not stick to the trunk interior paint, so I used heavy-duty hook and loop instead.


Very simple installation that connects to the existing tail light connectors without any extra splicing of wires

2015 Mazda CX-5

Item was plug and play as advertised. Paper instructions included are marginal. Site provided video was very helpful.

This is my second installation using etrailer; they've been good to deal with each time.

2015 Mazda CX-5

The hitch was great and went on without a problem. Wiring also worked great. Done! I bought from you because of your videos and they made installation so much easier. I am a do it yourselfer but at 73 was thankful for all you information and help via the videos. Would recommend your site to anyone in need of a hitch.

2015 Honda Accord

I installed this on my 2015 Honda Accord for the purpose of pulling my small aluminum fishing boat and trailer. Works great!

2014 Honda Accord

Very easy to install and just enough wiring for an Accord that there are no wires dangling in any locations.


Easy to install, worked as expected


I am pleased with your service and the product. Ease of installation is the best thing.


easy install and works great.


Like the fact that I can use my standard 2" ball mounts on this receiver hitch. Video for installation was very helpful.

2007 Honda Fit

Carol was extremely helpful on the phone figuring out the part I needed for my aging vehicle model and year, and this was after three trusted mechanics plus our Honda dealership all said that none of them could get the right part, because it wasn't being made anymore, and no scrap yards had it in stock either. Turns out the same part is actually still made, but only sold as a component within trailer hitch assemblies, not individually for repairing the actual vehicle. But, it's the same exact item, so my car is now legal to drive again, thanks to you folks. Very grateful.

2015 Mazda CX-5

My wife and I installed a 2" Curt trailer hitch (and wiring) on our 2015 Mazda CX-5. Total installation time was about 2 hours. We didn't have any problems with the instillation of the hitch or wiring. Etrailer has a video link available, which should be viewed before you begin your installation. However, there wasn't any audio with this.
The hitch is solid and appears to be well built. Occasionally, we pull a small aluminum trailer loaded with kayaks, or other light items.
We have ordered from Etrailer before and feel they are a good company to do business with.

Michael G.


Weve had our Curt hitch for over a year now and it still looks like new. Were very satisfied and recommend Curt and Etrailer.

2014 Mazda CX-5

Shipping was prompt and without issues. The install
On my 2014 Mazda cx5 was easy and stright forward. I watched the install video on the product page for CX5, and just
Followed the steps in video. Took 10min to remove interior panels, ect, and 10 min to make all plug and play connections, no issues.
Then 10min to put panels back in place. Tested the flat connector
As described in video. Works perfectly. This is after I went to Uhaul and they spent almost 2 hours under my CX5 baffled and unable to install a traditional trailer wire kit. I left with hitch only and installed this plug and play kit, completely satisfied.



Thanks so much.

Honda Accord

Second wiring harness I've ordered from First was for a Honda Civic I was leasing. I now have an Accord Sport sedan and expect the installation to be as easy as the previous. Just pull some trunk panels and connect plugs to existing light fixtures. I already popped the one side to verify I have standard lights vs the LEDs. Looks even easier than the Civic was. Totally satisfied with the price and shipping/tracking of the order.



I use the hitch mostly for my bicycle rack and it works as designed with no problems.I have tested the wiring harness and it operates the lights on my boat trailer also with no problems.Im happy with the products.


Custom fit perfect and easy to install


Works as advertised, installation was e asy.

2015 Honda Accord

Good communication. Fast shipping. installing wasn't to bad. For me the hardest part was getting the heat shield to fit and align the holes but that was about it. Did it all by myself except for actually mounting the receiver hitch to the car. Needed an extra set of hands for that. Receiver hitch and wiring harness about 2.5 hours complete install.



Works perfect still. Pulled my little 5x8 trailer all over Texas. Its worked out really well.

2015 Mazda CX-5

Another perfect Experience by eTrailer - Thanks Guys! Right Part,
Great Price, Quick Shipping. Don't know why I didn't get the Kit when
I got the Hitch, but now I can tow over the Road legally. Oh, excellent
how to Video - showed me that I have Tie Down Hooks in back!

Robert B.


Zero trouble with wiring. Had to wire brush rust from receiver once. Good Wisconsin rust never sleeps. Generally the whole package is so perfect that you forget its even there till you go to tow something.

Show More Reviews

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

  • Trailer Wiring and Installation Video for a 2013 Honda Accord
    We do have a video showing installation of Curt trailer wiring harness # C56011 that I have linked for you. The connectors on the harness will plug in line with the vehicle tail light wiring. I have included a link to the installation instructions for you.
    view full answer...
  • Curt Trailer Wiring Harness for a 2008 Mazda 3 that Does Not have LED Tail Lights
    Yes, Curt trailer wiring harness # C56011 will work with your 2008 Mazda 3 without LED tail lights. I have linked the instructions and a video review of this harness for you.
    view full answer...
  • Lights Flickering on a 2015 Honda Accord with Curt Wiring Harness Part # C56011
    The Curt T-Connector Vehicle Wiring Harness part # C56011 is indeed the correct wiring harness for your 2015 Honda Accord without LED tail lights. The issue you are describing sounds like a ground issue. Please make sure that the ground you are using is a clean bare metal surface without any paint present. This is more than likely the cause of your problem. Before attaching the ground screw, sand the surface down with some 80 grit sandpaper to remove any connection inhibiting material....
    view full answer...
  • Troubleshooting Wiring When All Lights Work Except Brake Lights
    You will need to check the stop light and/or CHMSL fuses in the towing vehicle. You may find that is causing the issue. You can then check to see if there are separate fuses or relays for the tow package wiring. You can check the owner's manual to find the locations of any fuses/relays. If the fuses and relays all check out it may be a problem with the ground. You will want to make certain both the vehicle and trailer side ground wires are attached to clean bare metal surfaces. Also make...
    view full answer...
  • Left Side Trailer Lights Not Working when 2015 Mazda CX-5 Running Lights are Turned On
    This does sound like a ground issue. 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...
    view full answer...
  • Trailer Wiring Harness for a 2013 Honda Accord Sedan without LED Tail Lights
    Curt does list wiring harness # C56011 as a fit for the 2013 Honda Accord sedan. The packaging might not be updated yet is all but it does fit. This harness actually fits numerous vehicles which is why the pictures in the instructions, linked for reference, may not look exactly like your vehicle. The instructions also list the coupe model but again the application guide goes up to 2012 for the coupe and then includes the sedan, without LED tail lights, for 2013.
    view full answer...
  • Installation Process for Curt 4-Pole Trailer Wiring Harness # C56011 in 2013 Mazda CX5
    The Curt trailer wiring harness you referenced, part # C56011, is a correct fit for your Mazda CX5. This plug-and-play harness connects at the tail light assemblies by plugging in between the vehicle wiring and the tail light assemblies. I have linked an install video showing a 2014 CX-5 that you can review. You will need to get access to the tail light wiring in order to connect the harness. This will require removal of interior access panels at the rear of the vehicle. The vehicle wiring...
    view full answer...
  • Wiring Connector For European Thule EasyFold Bike Rack On 2014 Mazda CX-5
    I spoke with my contact at Thule about your Thule EasyFold Bike Rack, part # TH9032. They told me that the models sold in the USA do not come with the 7-pin and 13-pin wiring connector. We do not offer an adapter for European wiring, and my recommendation would be to find a local mechanic or dealer that would be able to provide you with the connector needed for your 2014 Mazda CX-5.
    view full answer...
  • Easier to Install Trailer Wiring Harness for 2015 Mazda CX-5
    You're correct, the Curt wiring harness for your 2015 Mazda CX-5, part # C56011, does not have a power wire that connects to the vehicle battery like the Tekonsha, part # 118563. In most cases I'd recommend the Tekonsha even though the install is more involved. Most Tekonsha wiring harnesses have a converter box that mounts to the vehicle with a screw that keeps it much more secure than the double sided tape that Curt commonly uses. In this case, both harnesses use tape so I'd go ahead...
    view full answer...
  • Comparing Tow Ready # 118563 and Curt # C56011 Wiring Harnesses for 2016 Mazda CX-5
    The Tow Ready T-One Vehicle Wiring Harness # 118563 is a correct fit for your 2016 Mazda CX-5. The other harness offered, Curt # C56011, does not fit your 2016 CX-5 due to a change in connectors from the 2015 model year. Note that there are two major advantages to using the Tow Ready harness. First, this harness will isolate and protect your new vehicle's wiring from any potential shorts or overloads from the trailer because it draws power for the trailer directly from the battery, not...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2016 Mazda CX-5
    The hot lead is actually a way to protect the taillight circuits of the vehicle. What it does is allows the trailer taillights to be activated by drawing the power for them directly from the battery and not from the vehicle's taillights. It's actually the safest and best way to do it. For your 2016 Mazda CX-5 you would want the trailer wiring harness part # 118563 which is a confirmed fit. I attached an install video for this harness for you to check out as well.
    view full answer...
  • Recommended Trailer Wiring Harness for 2011 Mazda 3 Grand Touring with LED Tail Lights
    I do have a solution for you, however if your 2011 Mazda 3 is equipped with the LED tail lights, the Curt T-Connector Vehicle Wiring Harness # C56011 that you referenced will not be compatible. For your Grand Touring model that has the LED lights, I instead recommend the Hopkins Wiring Kit # 119179KIT. This is a universal, hardwire kit that features integrated circuit and overload protection to safeguard itself and your vehicle from electrical shorts. There is not a custom harness available...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2013 Mazda CX-5
    Either trailer wiring harness that you referenced would work great for you. Both the Tow Ready harness part # 118563 and the Curt # C56011 would work on your 2013 Mazda CX-5 that has incandescent lights and your trailer that has LEDs. We tend to have better luck with the Tow Ready harnesses so I would go with the # 118563. I attached an install video for you to check out as well.
    view full answer...
  • What is the Difference Between Trailer Wiring Harnesses for the 2013 Mazda CX-5
    For the 2013 Mazda CX-5 the Tow Ready wiring harness # 118563 is a powered converter that requires a direct connection to the vehicle battery to power the trailer lights. This protects the vehicle wiring and electrical components from damage. Because this unit uses a powered converter it will have a higher amperage rating (if the trailer has a lot of lights) than the Curt harness. The Curt harness # C56011 does not require a connection to the battery so it gets all of the power from the...
    view full answer...
  • Wiring Harness Fit and Recommendation for 2014 Mazda CX-5 Touring?
    For your 2014 Mazda CX-5 Touring, I recommend the Tow Ready T-One Vehicle Wiring Harness # 118563. This wiring harness is confirmed to work for CX-5s with or without LED taillights and will work well with your vehicle's wiring system. I spoke with my contact at Tow Ready and he confirmed that your CX-5 does not have pulse width modulation. Since the # 118563 wiring harness has a powered converter, it will use the vehicle battery to power the trailer's lights. Non-powered wiring harnesses,...
    view full answer...
  • Will Curt Wiring Harness # C56011 Fit 2015 Mazda CX-5
    Yes, my contact at Curt manufacturing confirmed that their T-Connector Vehicle Wiring Harness # C56011 will indeed fit and operate properly in your 2015 Mazda CX-5. New model year vehicles do take some time to be tested and confirmed for wiring and hitch fits but your new CX-5 is definitely compatible with this plug-and-play harness. The linked video illustrates installation in a 2013 model year CX-5 and the written instructions are also included. In case you run into any issues I have...
    view full answer...
  • How to Determine If a 2015 Mazda CX-5 Has LED Tailights
    The best way to tell whether or not your 2015 Mazda CX-5 came with LED tailights would be to contact the manufacturer with your VIN. They would be able to tell you without a doubt whether or not your vehicle has LED taillights. The other way would be to remove the taillight housing and look at the actual bulbs themselves as LED bulbs look much different than halogen bulbs. However, with that being said you do not need to know whether or not the vehicle has LED taillights to purchase a...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2015 Honda Civic Sedan
    The trailer wiring harness I recommend for your 2015 Honda Civic sedan is the T-One kit part # 118420 which is a confirmed custom fit. Of all of the wiring kit brands we carry this one is the most reliable so I recommend it the highest.
    view full answer...
  • Highest Tongue Weight Capacity Trailer Hitch for 2009 Mazda 3
    The highest capacity trailer hitch offered for a 2009 Mazda 3 is the Draw-Tite Sportframe Trailer Hitch Receiver part # 24816 which is rated at 2,000 lbs of gross trailer and 200 lbs of tongue weight. In regards to tongue weight, this includes the weight of the carrier and everything on it. If you need a higher tongue weight, the only option is a trailer which will also require wiring like the Curt T-Connector Vehicle Wiring Harness part # C56011.
    view full answer...
  • Recommended Trailer Wiring Harness For 2016 Honda Civic Sedan
    We do have a wiring kit that will work with your 2016 Civic but they require hardwiring the harness on your vehicle. Curt T-Connector Vehicle Wiring Harness, part # C56011 is not a confirmed fit for your 2016 Civic. The harness I recommend for your Civic is the Tekonsha # 118686.
    view full answer...
  • Trailer Wiring Harness for a 2016 Mazda CX-5
    We do have trailer wiring harnesses that will fit your 2016 Mazda CX-5 you can use Tow Ready harness # 118563. Or you could use Curt harness # C56011. I have included links to videos showing example installations of each harness.
    view full answer...
  • Curt Trailer Wiring Harness that Fits 2011 Honda Accord Crosstour
    We have a custom fit Curt trailer wiring harness that fits your 2011 Honda Accord Crosstour with the part # 56008 but the # C56011 is not the correct fit.
    view full answer...
  • Trailer Works with One vehicle But Not Another
    This sounds like a ground issue. 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...
    view full answer...
  • Trailer Wiring Harness for a 2014 Mazda CX-5
    Curt trailer wiring harness # C56011 fits the 2014 Mazda CX-5 if it does NOT have LED tail lights. If your CX-5 has LED tail lights then you can use harness # 118563. I have linked videos showing example installations of each harness for you.
    view full answer...

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