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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 # C56335
Our Price: $69.72
You Save: 38%
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. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56335 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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  • Reviews (102)
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CURT Custom Fit Vehicle Wiring - C56335

  • 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.


  • 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


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 6 amps per circuit
  • Limited 1-year 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 tail lights. You will have to remove the trunk floor coverings, rear scuff panel, side trim panels, and 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 trunk.

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.

56335 CURT Circuit Protected T-Connector Vehicle Wiring Harness

Replaces Curt C56164

Installation Details C56335 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 - C56335

Average Customer Rating:  4.7 out of 5 stars   (102 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.


Product installed easily. Only recommendation is to let users know in instructions that power can be obtained from the rear fuse panel with a spade connection. No need to run wire all the way to the battery for power.


Plug and play plugged right into existing wiring harness works great

2013 Ford Escape

Worked great for a month or 2 then I lost my brake lights and blinkers. All I'm left with are my running lights and sometimes even those don't work. I've looked at my ground and all of my connections and they're all completely fine. And I would go through fuses like crazy. I was changing the fuse almost every time I hooked up to a trailer

Etrailer Expert

Jenny N.


I wanted to see if I could help trouble shoot and I have a few questions that I wanted to ask. When the harness was installed did you run the power wire to the battery? Have you tested the 4 way with a circuit tester to see if the signals are reaching the 4 way? Please see the FAQ that we have below. It is very helpful in helping to identify the issue or determine if a new harness is needed.


It died after 1 year and now all I see is lights on all the time even when the car lights are off.

Etrailer Expert

Jenny N.


The harness may still be able to be saved. It sounds like that the harness may have a grounding issue or it may have been overloaded. Both are testable and possibly can be fixed. Please see the FAQ below and take a look at method 3 and method 5 for testing the harness.

2003 Jeep Wrangler

I put this in my 2003 Jeep Wrangler along with Break Buddy Stealth. This harness connected in perfectly. The flat tow system is working great one year and ~10k miles latter. etrailer is always best support, pick up the phone and they guide you though buying the right product and installing it.


This Hitch is great was a breeze to install with some help from a good friend and there are no complaints here fits just a specified with no issues
I have had this for a year On My 2013 Ford Escape
Use it for taking trash to the Dump, as well as got a nice 5X8 Trailer for hauling my tractor and motorcycles and other things.....Not disappointed

2013 Ford Escape

Haven't installed yet but seems to be high quality and arrived fast right on time just like always. This isnt my first buy and wont be my last one cause they are good people to work with and help is amazing. Thanks fir all your help and taking care of your customers



The wiring still working great and no problems yet. East to hook up and the instructions was very understandable. Very good product after a year!


It's worked out great with no issues.


Although everything works great and the kit is complete, I was disappointed to see that The connectors for my 2013 escape were outside of the car. I determined the installation would be more waterproof by cutting off the connectors and splicing the traditional way with tap splices behind panels in the trunk.

Otherwise you have to make huge cuts in rubber gaskets to pass the connectors through to behind the tail lights, I didn't want to take a chance of water entering the cabin.

Thus, I would recommend a universal kit for any modern Ford escape.


I like it, I'm glad I bought it. My son and I put it on in about 45 minutes and I put the wiring harness on in about half an hour. I've used it only once so far; it works well. I would buy it again and would recommend it to others.

James G.


I like it. Its reliable.


We backed out of installing this unit after reading the troubleshooting guide. Weren’t comfortable with the possibility of a malfunction in the control box damaging the Escape’s circuitry or driving without functioning tail lights and not knowing it. We’ve installed plenty of hardwired harnesses without this concern.

2014 Ford Escape

Took several hours to install, not because of the kit itself necessarily, it snapped in fairly easy. Problems were due to vehicle itself and difficulty accessing areas necessary behind panels and taillights. Installed the power lead wire going through the interior of the vehicle, just didn't feel comfortable with it going down the underside at all. Had to google recommendations for that since it was not covered at all in the directions. Speaking of, directions could be a little clearer, and small dark printed photos don't help as much as they should. Would also recommend you get your own butt connectors with built in shrink wrap for a few dollars more. May just be personal preference, but have never liked those cheap ones that come with kits like this.


Perfect, great instructions

2014 Ford Escape

First, I will say the service was great. I had a problem with a wire that came off, and was able to speak to a tech, and he sent me a new one. This probably would not have happened if the product were designed better for my 2014 Ford Escape. You have to put a large object through a very narrow passage under the tail lights. I changed the design by installing my own wires leading from the tail lights down to the bumper area, so all you have to do is fish these wires through, and re-attach. Much simpler and cleaner than the original. Just had to splice a few wires.


As with all custom wiring harnesses from etrailer, this one worked immediately. It was used to replace a similar/older one that had been damaged in a rear-end collision, unfortunately. Everything works as it should, and the Customer Service from etrailer is always the best.

2013 Ford Escape

I have not installed this yet but I did open the package to review the installation it appears to be very easy to install one thing I did not realize is you have to run a wire from the back of your car to the battery compartment to power up the lights for the trailer which makes sense so you don’t blow the fuse for your cars brake lights if a problem occurs on the trailer

2014 Ford Escape

Wiring Harness, the 'Curt' Hitch and Brake Module mounted and Worked Perfectly on my 2014 Ford Escape ,,, Shipping was Fast and Complete. Thank You, Ken H.


Shipped right away. The instructions were clear and installed without issue.

2014 Ford Escape

This product is easy to install and works exactly as suppose too

2016 Ford Escape

I don't usually work on cars. I installed this in my 2016 Ford Escape in my garage with no help except the video and 1 jack stand. It took me 3 1/2 hours. Everything fit like it should, all the parts were there. Fishing the power wire to the battery took most of the time. The guy in the video could stand under the car! I would rate this kit excellent.


Good product but there isn’t the sufficient length of wiring to complete a normal installation. Had to go to [auto store] and buy additional wire to add the proper length needed.

Etrailer Expert

Sierra K.


You have to install the wiring harness exactly where the directions say to put the wires or there will not be enough. It shouldnt be loose around moving parts.

2014 Ford Escape

This wiring harness for my Escape is just what I needed. The factory wiring quit working so I replaced it with the S56335 harness. It cost much less than the Ford replacement parts, and works as well or better than the factory equipment. The installation instructions that came with it made it very easy to install. I definitely recommend this Curt wiring harness.


Wiring harness worked flawlessly from the getgo. Nearly broke my fingers pushing the plugs through the rubber grommets!


What wire gage do I need for the wire that has to be run from the Curt-T wiring harness to the battery? And approximately, how many feet of wiring do I need for a 2013 Ford Escape SUV.


I will be installing it tomorrow. I have used this before and was very happy with ever It would be great if you came out with a connector that would be like a factory tow package connector would be. One disadvantage is there is no way to hook up the connector for the trailer brakes to function.

Show More Reviews

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

  • Why Does Curt 4-Way Kit part # C56335 Store In Interior of Vehicle
    Having the 4-way run out of the back hatch is actually the preferred method although it seems like it wouldn't be. Having the 4-way stored inside the cab of the vehicle keeps it protected from rain and moisture to prevent corrosion and keeps it protected from damage to the wiring or connector by rocks or debris that might be on the highway. You can run the wire through the vehicle if you wish but just keep in mind that this does take more time and you may end up needing additional wire...
    view full answer...
  • Does Negative Battery Terminal of 2015 Ford Escape Remove to Install Trailer Wiring
    Yes the first step when installing the Curt trailer wiring harness part # C56335 is to disconnect the negative battery terminal of your 2015 Ford Escape. I also attached a link to an install video for this kit on a similar Ford Escape for you to check out as well.
    view full answer...
  • Could Amp Wiring be Used to Power Trailer Wiring for 2016 Ford Escape
    Technically yes you could use the amp wire you have now to power the Curt trailer wiring connector part # C56335 for your 2016 Ford Escape. That said if your amp is being pushed really hard and at the amperage draw limit of your 4 gauge wiring your trailer lights might stop working. Most likely you'd see them fade in and out. If your wiring is way overkill for your amp like most are you'd never run into this problem. Be sure to run the included inline fuse on the wiring before it gets...
    view full answer...
  • Recommended Wiring Harness For A 2013 Ford Escape
    When installing a trailer wiring harness on your 2013 Ford Escape The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56335 is confirmed to fit your vehicle. The harness plugs into the vehicle's wiring harness which is located behind the driver's-side and passenger's side tail lights. You will also have to run the hot lead up to the car battery. I attached an installation video link below.
    view full answer...
  • Comparison of Curt 4-Way Trailer Wiring Harnesses that Fit a 2016 Ford Escape
    Essentially, the wiring harnesses are both designed for the 2016 Ford Escape and both provide a 4-way trailer connector. The # C56335 is the newer and more durable solution for you and your needs.
    view full answer...
  • Does Modulite for Wiring Harness on 2013 Ford Escape Drain Battery
    A modulite like the T-One Vehicle Wiring Harness # 118566 you have on your 2013 Ford Escape should not take power from the battery unless the lighting functions are activated and you have a trailer connected. The reason is, that's when it gets a signal from the lights which tells it - so to speak - to draw power. So it isn't normal for the modulite to draw power unless it is being used, and I can say that this is the first time I've ever heard of the connection being made between a battery...
    view full answer...
  • Tips for Routing a Trailer Wiring Harness Power Wire on a 2013 Ford Escape
    There are actually several different methods you could employ when routing the power wire for a trailer wiring harness such as # C56335. The quickest method is to just route it under the vehicle and use zip ties to secure it to various places from front to back. I have included a couple links that should help you with this installation.
    view full answer...
  • Does Power Wire of Trailer Wiring Need to Run all the Way to Vehicle Battery on 2014 Ford Escape
    Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. For your 2014 Ford Escape you need to install a harness that draws power from the battery to protect the taillight circuits. For that you would need...
    view full answer...
  • Recommended Route for Power Wire on a 2015 Ford Escape with Fuse Panel at the Rear
    Great question, I asked my contact at Curt and he informed me that to protect the vehicle as well as the wiring harness converter the power wire needs to be run to the battery. I have linked the Curt wiring harness to this page for your purchasing convenience.
    view full answer...
  • Difference Between 4-Flat Harnesses for 2016 and 2018 Ford Escape
    The Curt 4-Flat Wiring Harness # C56335 will NOT work with your 2018 Ford Escape, you will need to use the Curt Wiring Harness # C56320. These plug-in harnesses are vehicle-specific fits and if you take a look at the accompanying photos you can see that the plugs are different on the harnesses.
    view full answer...
    Image 1 for Image 2 for
  • Troubleshooting Trailer Wiring that Stopped Working on 2013 Ford Escape, Fuse is Good
    It is possible that you shorted out the converter box of the trailer wiring on your 2013 Ford Escape. You will need to test the wires going into the box and then see if there is the correct output on the output wires of the box. If there isn't voltage going into the box then the connections are at fault. If there isn't voltage coming out of the box then either the fuse is blown or the box is shorted. Check out the video I attached to see more info on testing the box. For a replacement...
    view full answer...
  • Troubleshooting Low Voltage Trailer Wiring for 2013 Ford Escape
    I do have a way for you to test the wiring on your 2013 Ford Escape and it will be the same whether you have the T-Connector # C56335 or T-One # 118566. If you've already checked all of your connections and found them to be in proper working order then you'll want to check the control module like what you said. Check the voltage for the wiring going into the module and then coming out of the module to do this. If the voltage is different then the module isn't working correctly and you'll...
    view full answer...
  • Trailer Running Lights Not Working when 2016 Ford Escape is Running
    Do you know which wiring harness is on your 2016 Ford Escape? The Curt powered converters such as # C56335 have be known to have some issues similar to this but not exactly the same. There are ways to test to determine if the wiring harness is the problem. Using a circuit tester such as # PTW2993 or a meter if you have one first start the vehicle (since the problem occurs when it is running). Then have some one sit in the vehicle and run through the light functions while you test the...
    view full answer...
  • Installing a Brake Controller in a 2014 Ford Escape
    To install the Tekonsha Voyager Brake Controller part # 39510 in your 2014 Ford Escape you will need to splice into the cold side of the brake switch with the red wire of the controller. I attached a video that shows a brake controller being installed on a very similar Ford Escape as your 2014 model. In case you aren't sure what parts you would need you also would need a 4-way to start. For that you would want the # C56335. Now to convert that to a 7-way and install the brake controller...
    view full answer...
  • Are Tail Light Connectors Only Available By Themselves for Trailer Wiring on a 2013 Ford Escape
    The connectors from any trailer wiring harness are not available by themselves. You could buy the harness and cut them off but if you were to buy it you might as well install that one and return the hardwire harness to the dealer. Or I could help you install the hardwire harness. It is actually pretty easy. You just need a circuit tester such as # PTW2993 to test the vehicle tail light wiring. On the driver side you will need to find the left turn signal wire and the running light wire....
    view full answer...
  • Hitch and Trailer Wiring Recommendation for a 2014 Ford Escape SE
    Some hitches have confirmed to fit both the 2013 and 2014 Ford Escapes. The Curt hitch part # C13186 that you referenced will only fit the 2013 SE, SEL, and Titanium models so I would not recommend it for you. The Draw-Tite part # 75758 will fit both the 2013 and 2014 models so I would recommend it for you. I attached an install video for you to check out as well. The installation instructions do not recommend lowering the exhaust. You will have to run the power wire from the Curt Harness...
    view full answer...
  • Will Curt Hitch C12111 fit a 2016 Ford Escape S Model
    I am pretty sure you mean to type 2016 Escape, but yes the Curt Hitch part # C12111 has been confirmed as a fit for all models of the 2016 Ford Escape so it would work well on your S model. For a hitch ball with a 1-7/8 inch hitch ball you would want the part # C45551 or for a 2 inch ball # C45552. For trailer wiring you would want the part # C56335.
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  • Towing Capacity and Parts Needed To Tow with a 2016 Ford Escape
    The trailer hitch I recommend for a 2016 Ford Escape is the etrailer Trailer Hitch Receiver part # e98866. This hitch has a bolt-on fit with no cutting or drilling required. It will also work with the hands free liftgate feature if equipped. This hitch has the larger 2" receiver which I recommend due to the greater variety of accessories. In order to complete your setup you'll also need a trailer wiring harness for which I recommend the Curt T-Connector Vehicle Wiring Harness with 4-Pole...
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  • 2013 Ford Escape Trailer Wiring Recommendation for Trailer Lights
    The 2013 Ford Escape wiring you need to activate your trailer lights is the Curt T-Connector # C56335. This tees in behind your tail lights and then draws power directly from your vehicle battery via the lead wire (see attached install video). I also recommend picking up the mounting brackets # BK4F and # 18140 so your connector is readily accessible when you need it!
    view full answer...
  • Troubleshooting Trailer That Wont Directly Connect to Curt 4-Way Harness on 2016 Ford Edge
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56335 is the correct fit for your 2016 Ford Escape and comes with the standard 4-way vehicle side connector. If your trailer doesn't have the standard 4-way trailer connector for the trailer side like # HM38134 for example, then you will want to replace it. You can splice in a connector like this or replace the entire wiring harness with # A20WB for example. I've attached an article on trailer wiring to...
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Amanda M
Written by:
Amanda M
Employee Ryan G
Test Fit:
Ryan G

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