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  5. 4 Flat
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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 # C56120
Retail:$86.31
Our Price: $60.37
You Save: 30%
Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance. 1-636-306-4830 to order CURT custom fit vehicle wiring part number C56120 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 (147)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C56120

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • CURT

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


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
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • 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 driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery.


Once installation is complete, the 4-way connector will be stowed 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.


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.



56120 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56120 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 - C56120

Average Customer Rating:  4.9 out of 5 stars   (147 Customer Reviews)

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

by:
2013 Ford Edge

The wiring kit worked great. Pro tip, if you have the power outlet on the LH side, just grab your constant hot there. It's more than sufficient to power the module and you'll already have that panel loose anyway. There is a nice ground back there too. My only complaint is having to put such a large slice in the OEM grommet for the large molex connectors.




by:

The hitch and the wiring harness went on the vehicle just like your utube videos showed. This is the second etrailor hitch and wiring harness i have installed on my personal vehicles, and I have to say that I am a fan. Thanks for having a great product and superb technical instructions to go with it.




by:

Came with everything you need. Good quality wire and accessories. Needed it because I got a good deal on vehicle, but it had no hitch or wiring for one.


Comments
So far no problems after a year.
Steven - 05/14/2022


by:
2013 Ford Edge

I ordered this item to go with the CURT Class III 2" receiver, it was a breeze to install and looks great. The shipping was AMAZING and showed up as promised... I would recommend the company and site to anyone!

* Quick install Tip if you have the upgraded stereo system as I did the passenger side tail light is a little tight. You can remove the factory subwoofer box and follow the provided instructions from there or if you are "semi-handy" you can cut the (green wire) and insert from the gasket, then simply splice the wire back. I chose the splice option, and everything works beautifully.




by:

Everything was neatly package and install was easy




by:
2012 Ford Edge

I would not ever consider buying tires anywhere else than etrailer. Your 5 star tires,service and follow up are wonderful.




by:

The hitch and wiring harness worked per fect.




by:
2013 Ford Edge

It was completely plug and play with the exception of the positive power run to the battery. Setup was easy and running the the wires to the tail light was easy as there is sufficient room to get the wires and hand through the desired areas.




by:
2013 Ford Edge

I received this harness today and installed it in 45 minutes, on my lunch break. I have an Edge Limited with electric tailgate lift and base speaker in the rear, so both my right and left side were supposed to be difficult to access. At least according to the other reviews. The left side, the side with the electric lift gate arm, was done in this manner. I removed the tail light and pulled out the grommet from the outside, then fed the wiring up the inside of the trunk with my arm and used my other hand from the grommet hole to feel for the wiring. Once I felt it, I pulled it through. The other side was a bit more tricky. Once the outer trim is removed, the speaker cabinet is still in the way. But, I found 3 10mm bolts. I loosened them (they don't need to be fully removed) and that gave me enough room to pull the cabinet away from the wall and slide the wiring up and out of the grommet hole. Piece of cake. I then took the positive battery wiring and fed it through starting from the battery. Go backwards, it's much easier. Great kit and was a snap to install.


Comments
Great harness and install instructions
Tom L - 09/14/2016


by:

A year later, and all is good! Absolutely no complaints.




by:
2013 Ford Edge

Professional product. Install was medium difficulty but had good results. The flat 4 pin receiver just dangles from around my trailer hitch. Wish a clip or bracket to mount it could have been included. Would have made a neater looking install.


Comments
the trailer wiring kit is doing just fine. Very pleased. Thanks
Jerry W - 08/03/2018


by:
2014 Ford Edge

Very happy thus far with etrailer.com and their delivery of the purchased products. Cost and quality are very good. Haven't installed it yet , but if it goes as easily as shown in the installation videos, I will be VERY satisfied.


Comments
Thanks for reaching out and checking back with me. I love it. If I need to buy another one in the future I will be buying it through you all.
Mike V - 04/26/2016


by:
2012 Ford Edge

I purchased this wiring kit for my '13 Ford Edge along with a Curt hitch and an additional wiring kit to get electric brake control with a 7-blade connector.
This kit interfaces with the factory wiring by sensing which bulbs are being illuminated without actually being wired together with the 4 pin connector. The well written instructions made the job easy. I ran the 12 volt power wire up to the front of the SUV when I ran the cable for the electric brake controller.
The 4 pin connector simply plugs into the 7-blade connector in the other wiring kit.




by:

Perfect fit. Easy installation. All you need in the package. I will highly recommend this product.




by:
2013 Ford Edge

My Curt T-Connector wiring harness arrived sooner than promised - Thanks etrailer! The installation instructions and video on etrailer were a big help. The instructions that come with the unit do not include some of the detail/tips that the etrailer video does. I took my time and was very satisfied with the finished installation. My trailer has LED lights and this adapter works just fine with them.

The installation goes pretty much as shown in the video. Here's a couple of tips from my installation:

Getting the taillights out wasn't as easy as the video shows. I used the handle of a flat tablespoon and slipped it between the front of the taillight lens and bodywork. Pry back toward the rear of the car to help loosen the taillight from the two locating pins. This prevents marring the body paint and helps you pull straight back on the taillight. They come out with a scary-sounding "pop".

I found that it was not necessary to remove the rear trim panel to get the spare tire compartment bins out. I just lifted up the front of the bins while pulling back on the trim panel and the bins came out easily. I also found that it was not necessary to loosen the side panels to feed the adapter plugs up to the taillight wire opening. I was able to reach these through the opening near the bottom. The passenger side was a little tight, but I was able to wiggle the adaptor plugs through.

The video shows that you cut through the taillight wiring grommet from the outside to the center to install the adaptor wires. I was worried about the grommet not sealing properly on re-installation. I cut a slit in the grommet from the center to close to the outside edge - but not cutting through the ring that seals against the bodywork. I was able to stretch the slit over the adaptor plugs and wires while leaving the outer sealing ring intact. I used the included silicone sealant to seal up the slit where the adaptor wires come through. I'm very comfortable that I have a positive seal that will not leak.

I decided not to route the flat plug wires out through the spare tire compartment grommet as shown in the video. Instead, I keep the flat plug wiring in the spare tire compartment (when not in use) and route it out beneath the hatch door when I want to use the trailer. The installation video for the Tekonsha T-One adaptor shows this method. Seems to work just fine.

Other than these differences, the installation went exactly as shown in the video. The adaptor has been working great with no issues. Thanks etrailer!




by:
2011 Ford Edge

The box arrived quickly, contents in perfect condition. The hitch was perfectly engineered to fit our Ford making the assembly easy and required just basic tools. Your company's wire pull through gadget is very clever, easy to use and solve the huge problem of getting the fasteners in place. We have used the trailer a dozen times and it sure comes in handy. The electric harness took the most time since I did not want to have loose wires showing anywhere. I would, without hesitancy, recommend etrailer's parts.




by:
2013 Ford Edge

With the instructions provided, including the associated video, the installation was really easy, and all of the components were top quality.

However, the first time we hooked up a camper we had just driven 4 hours to pick up, the brakes defaulted to "on", and we could not drive with the brake controller hooked up.

Now the best part..... An etrailer technician took our call immediately, and had the background knowledge to know that some Nissan Xterras had factory wiring reversed, which required the corresponding kit wiring to be reversed. After we did so, the system worked perfectly. I would not have figured that out in a million years!!!!!

Great product made even better by fantastic service!!! Customer for life.....




by:
2011 Ford Edge

First, ordering from Etrailer has always been a breeze. They go the extra mile to make sure you get your order correct and on time. The kit is exactly as represented, and connecting it is easy. As for the installation, it took two of us 1 and 1/2 hours. We did have a vehicle lift which probably shortened the install time by 1/2 an hour. The only issues we ran into were on the passenger tail light. I have the Premium Sony sound system. The speaker box won't allow for the harness to fit behind it to plug into the tail light. We had to loosen the one bolt. Then we taped a fish wire to the harness. While one of us pulled the speaker back (Don't pull too hard or it will break), we fished the harness through. The other area that was a little more difficult than the video represented was getting the hot lead up to the battery. Again, fish a wire from the battery down to the ground. Tape the hot lead to the fish wire and pull. You can do this all yourself, but you'd benefit with an extra pair of hands when pulling the speaker assembly back.




by:
2011 Ford Edge

Product worked just fine, once installed. Running the power lead all the way to the battery is an extra chore, when others only in the past only required a t-connection at the tail light. There was no instruction or tip on how difficult it was to route the t-connections through the tight grommet, down inside the body and into the spare tire area.


Comments
We are glad you mentioned the installation of the hot lead, Andrew. While it is an additional and sometimes cumbersome step, the hot lead is actually a way to protect the taillight circuits of the vehicle. It allows the trailer taillights to be activated by drawing the power for them directly from the battery and not from the taillights of the vehicle. This actually protects your vehicle wiring and is the safest and best way to do it.
-- Etrailer Expert Laura E - 11/10/2016


by:
2011 Ford Edge

Instructions along with video made the installation procedure straight forward. Removing or loosening plastic trim not difficult, however takes a bit of time to be careful when reinstalling and making sure everything lines back up like it should. I have a 2011 Ford Edge and there is a perfect flat spot about the size of the control box under the driver side taillight, almost like it was made for it! Running the black wire back up to the battery took me some time as I was doing by myself without a lift. I had to remove a protective shield underneath the drivers side of the vehicle. This gave me easy access to mounting points for the wire zip ties. Used a thick wire to pull black wire up to battery. Installed inline fuse. Connected to battery. Took me 2 hours to install. Worked perfectly first time with trailer!




by:
2014 Ford Edge

I purchased the C56120 trailer wiring kit and a 20174 Light Kit for my hitch extender carrying rack. They arrived on time as promised. I watched the install video for the wiring harness on the E-trailer website prior to installing it myself. The install was according to instructions and everything installed and worked perfectly. The result is a professional looking install at a fraction of what a trailer dealer would have charged. I will be a returning customer and I highly recommend E-trailer.




by:

Awesome !!! Installation was a snap. Harness has been installed now for a year and have no issues with this product at all.


Comments
AWESOME! No issues with the harness at all!
Scott F - 01/06/2021


by:
2012 Ford Edge

Ordered a T-connector for a 2012 Ford Edge. Unfortunately I didn't get to use it because I discovered the previous owner had already installed one, it was hiding behind a molded plastic panel in the back. The shipping was prompt and it looked like a very high quality product, the return for refund went without a hitch (no pun intended). I have purchased hitches and T-connectors from etrailer.com before and will continue to use them in the future. Excellent customer service!!




by:
2013 Ford Edge

this is the second receiver and wiring kit I have bought and installed. I just traded the first vehicle on a year new one and am putting the same receiver and wiring kit on the new vehicle. Make sure you review the installation video and pay attention. I did not on the first install and ended up taking off the rear bumper cover to see why the bolt and anchor did not fit. If I had payed attention to the video I would have see they do not go thru the back of the frame rail as one...you need to string them together and then pull them together once inside the frame rail. My bad. The wiring harness was easy to install...love the plug and play installation.
I have a pic with the cover and bumper off showing the large opening to the back of the frame rail. the other pic shows the hole I tried to put the bolt and anchor thru as a unit. Obviously would not fit.




by:
2012 Ford Edge

Wiring harness has work without any problems. Installation was clear and easy. The service from etrailer was friendly and fast. Would recomend etrailer to anyone needing trailer products.



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Show More Reviews

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

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    It sounds like you do not have the 12 volt power supply installed correctly. The 12 volt power supply like the one on the Curt T-Connector Vehicle Wiring Harness part # C56120 which is a fit for your 2012 Ford Edge will need to be ran directly to the battery with the included 10 amp fuse placed 6" from the positive terminal. You cannot use any other power source for the wiring harness and it sounds like you may have it tied into an interior lighting circuit which is why the lights only...
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    It's hard to say exactly what the wire you found in the back of your 2011 Ford Edge was used for. It could have been for a stereo. But since the Curt Wiring harness # C56120 that you referenced requires you to run the battery wire all the way to the positive battery post you would need to run that wire to the battery instead of the fuse box if you plan to use it for this install. I attached an install video for this harness for you to check out as well.
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  • Troubleshooting Trailer Wiring that is Dim on One Side of Trailer
    Sounds like the problem is actually on the trailer side of the equation. Most likely the grounds on the driver side of the trailer wiring are insufficient and causing the lights to illuminate dimly. Make sure that the trailer side connector 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 surfaces. If there is anything...
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  • Installation of the Curt Custom Wiring Harness # C56120 on a 2013 Ford Edge
    There are a set of installation instructions included with the Curt Custom Wiring Harness, # C56120. I have also attached a link to the instructions for you to check out. The instructions even include photos of the installation process. To install this wiring harness on your 2013 Ford Edge, you will need to gain access to the back of the tail light assemblies. This is done by removing two bolts that hold the tail lights in place. Once you remove the tail light assembly, you will see a...
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  • Troubleshooting a Blown Trailer wiring Harness on a 2012 Ford Edge EcoBoost
    I hate to say it, but the company who installed your harness is probably right. We see what you are describing pretty often and the problem is almost always a short on the trailer. Or its that the lights on the trailer draw too much amperage for the converter and it shorts out like that. The reason the box will short out and not the fuse is because the fuse is between the battery and the converter, whereas the short is on the other side of the converter box. The fuse protects the converter...
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  • Troubleshooting a 2008 Ford F150 Trailer Connector with all Functions not Working
    You really should not have to put a plastic bag over the trailer connector on your vehicle during rain. It should be protected enough that that would not be necessary. In fact, the plastic bag could actually have collected water and held it to the connector and caused moisture to short out circuits on the connector. It sounds like a relay or fuse is blown and took out all of the trailer wiring circuits. If you can find the battery junction box you should check the condition of the following...
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  • Troubleshooting No Power at Factory Brake Controller Port on 2008 Ford F-150
    If you aren't getting any power to the factory brake controller port beneath the dash of your Ford F-150 then most likely you have a blown fuse under the hood. I took a look at the online version of the owner's manual for your 2008 Ford F-150 and it lists the trailer brake controller fuse in the F105 position inside the power distribution box. This is a 30 amp cartridge fuse. Replacing this particular fuse should get power back to the brake controller port and resolve your issue.
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    LED lights draw such a low amount of amperage that basically any amount of bled through voltage/amperage can light them up. So in situations like yours basically you discovered that your one light circuit has a small amount of bleed through that is lighting up the single LED. One solution is to just try and ignore it as it won't really affect anything. Or you could disconnect the wiring when not in use.
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  • Is There a Trailer Hitch for a 2014 Ford Edge SEL That Does Not Require Drilling
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  • Trailer Wiring Harness Recommendations for 2013 Ford Edge
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  • Wiring Harness for 2012 Ford Edge
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  • Troubleshooting Factory 4 Pole Trailer Connector on 2013 Ford Edge
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    Since it only takes a tiny amount of voltage to illuminate an LED what you are seeing is normal. The tiny bit of voltage present on your trailer wiring harness is illuminating your LEDs slightly. What you can do is install load resistors on the circuits of your trailer that are dimly lit and the problem will go away. For that you would want the part # DI34ZR. My contact at Curt stated that the small amount of power will not drain the vehicle battery since it is much a minute amount of...
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    If the dry tongue weight of your pop-up camper is 358 lbs then most likely it would be even higher when loaded and ready to tow. The best recommendation I can make would be for you to upgrade to a hitch with more tongue weight capacity like the Curt Hitch part # C13067 as it can handle up to 400 lbs of tongue weight. You will also need to check the towing capacity of your vehicle in the owners manual as well and be sure not to exceed the lower of the two figures. For trailer wiring you...
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  • Trailer Wiring Harness Recommendation for a 2013 Ford Edge
    It would appear as if the Replacement OEM Wiring Harness part # C56110 that you referenced would work on your 2013 Ford Edge since you have what looks like the correct port for it. By the way, thanks for the picture. What you can do to verify that the plug is active is use a circuit tester like our part # PTW2993 and test the different pins you see for voltage when the brakes/blinkers/running lights are on. If the pins carry voltage with the use of your taillight functions then the # C56110...
    view full answer...
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    Need to return an item? No problem. Please read our Returns Policy for more information.

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