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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 # C56334
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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 C56334 or order online at 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 (152)
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CURT Custom Fit Vehicle Wiring - C56334

  • 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
  • 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 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 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 rear 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.

56334 Curt T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Replaces Curt C56183

Installation Details C56334 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 - C56334

Average Customer Rating:  4.8 out of 5 stars   (151 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.


Installation instructions were good. Most difficult part was running hot wire to car battery.

2012 Jeep Liberty

Amazingly easy to install. Hardest part was running the wire to the battery. Everything else was simple plug in. Also, extremely fast shipping and courtesy follow through via emails from customer service representative! Thank you!
Didn't take pictures during install so only finished plug next to my hitch!


Took me a little over a half hour to install it. It has worked perfect ever since.Excellent product


It fit my 2012 Jeep perfectly. Plug-ins all matched up, easy install.

Have hauled several loads up to the cabin. Everything works great, small area of paint on the hitch needed to be touched up.
Dave - 04/10/2022


This is the third wiring harness I have bought they are very easy to install.I like to add a layer of electrical tape over all the wires to add one more layer.I travel a lot of gravel and winter roads. Mike

2012 Jeep Liberty

very happy with the packaging. The hitch arrived in just a couple days even with the free shipping my son and I installed the hitch the next day this past advertised once the pesky existing nut was removed from our Jeep, the hitch install was easy.


Bought this for our 21 year old granddaughter who is taking off to tour the country with her camper. Easy install on her Jeep and working great.


Excellent help they know what they are talking about I will be a repeat customer.This number I am keeping

2012 Jeep Liberty

Order and delivery was easy. Product was easy to plug in with no cutting or splicing into vehicle wiring. I did purchase 20 ft. of 3/8 wire loom to protect the feed wire run to the battery. All went well, a quality install.

2010 Jeep Liberty

2 day shipping for free Chicago city ,Very easy to install !!! 30 minutes plus wiring connections maybe a hour.


As advertised. Harness only took about 45 minutes to install but the power line was another story. Exhaust lines, drive shafts, steering column, etc., caused the power line to take about 2 hours to route and secure with wire ties. Works great though.

works great! I use it 2 or 3 times per week.
Gregg H - 06/09/2017


Still working, that's what matters.

2008 Dodge Nitro

The wiring harness was a easy to install. The written instructions weren't real clear, but the video on the etrailer website was right on and a great help.

Great. Went on a five month trip up the California-Oregon coast. No problems with wiring ??
Robert E - 11/15/2016


My cousin installed it for me. Didn't take too long. Works like it should.


I first looked at etrailer because of the price but I chose to purchase from etrailer because of the helpful "how to" videos. Wiring harness seemed too difficult until I watched the video. Mounting the hitch and installing the wiring was as easy as can be. Product seems to be quality made, very solid and welds look good. The paint finish even still looks good after a year. I work for a truck parts supply company and I have been recommending etrailer to all of my customers, co-workers and friends & family since my purchase.

2012 Jeep Liberty

I haven't used it yet, but the connector tested out fine. I wish the kit included the air tubing they used in the instructional video, or something to fish the wire through the framing. I spent a few hours looking for and trouble shooting something that would do the trick. After picking up electrical fish tape from a local hardware store, the dang thing still wouldn't go all the way through like the video. I wonder if my 2012 Liberty is structured differently than the 2008 in the video. I gave up on trying to run the hot wire like the video, and just routed it under the Jeep as best as I could. Hooking up everything else really was pretty simple. When testing the connector with a test light (I don't own a trailer), make sure your trucks' lights are ON to test the first terminal and then blinkers for the other two. Don't be like me and think that your connections are bad and spend a while testing everything when all you have to do is turn your lights and blinkers on (being in a hurry didn't help this stupid mistake). Other than running the wire under the car, this kit is easy to install.


Neat clean install, very easy and great instructions. Very good company to work with

Unit shorted out 6 months after installation, tried to get a replacement but was told product is no longer available, currently no harness is in use trying to find a replacement
Darrell - 08/27/2017

2002 Dodge Durango

the problem is that the sidemarker lights on the tail light stays light even when the vehicle is turned off . my brake lights don't even go on when the vehicle is turned off I have to make sure I unplug the trailer even when its still on the hitch .. . the connectors are good, the minimal wires are good to stuff behind the vehicle tail light... not to bulky


Shipping sat

2012 Jeep Liberty

I have been using this product for over a year now and it still works great. I installed this on my 2012 Jeep Liberty and opted to run all of the wiring under the wheel well panels. I use this harness weekly and it has had zero issues. Highly recommended.

2011 Jeep Liberty

Everything went together pretty good..the connectors that come with the kit aren't great but they work..overall nice kit..I chose to run my power wire in through the driver side taillight grommet and down the side of the vehicle under the panels instead of under the car through the frame rail


Exactly as described, received in a timely fashion.
Installation was very easy.. works perfectly...two thumbs up..

2011 Jeep Liberty

There is a difference between product excellence in design, and the ability of the installer. The longest (and for me most frustrating aspect) part of the installation was running the unit power wire from the rear of my vehicle to the battery in the engine compartment. I should add that I'm anal retentive when it comes to wanting anything I install on one of my vehicles to look "factory."

The kit was excellent, well thought out, and very well supported by both printed and online video installation instructions. Everything necessary was supplied, zip ties, double-sided mounting tape for adhering the power unit to the vehicle, even the self-tapping sheet metal screw for providing ground to the power unit, and butt-connectors for splicing the wires where required.! etrailer didn't miss a trick and I wouldn't hesitate to recommend their product(s) to anyone.

2012 Jeep Liberty

This wiring harness was very easy to install on my 2012 Liberty. The instructions were very well illistrated and I also used the helpful videos provide on Youtube. A+


Easy to install

Show More Reviews

Ask the Experts about this CURT Custom Fit Vehicle Wiring

  • Brake Lights on 2009 Jeep Liberty Stay on While Driving w/ Curt T-Connector Wiring Harness Installed
    I reached out to my contact at Curt and they agree that it sounds like the converter box on the T-Connector Vehicle Wiring Harness, # C56334 might be bad. You can troubleshoot the converter by using a circuit tester like # 40376, on the input side of the converter (wires leading from the connection to the vehicle taillight harness to the converter box). Test each wire as it's function is activated- red wire = brake lamps, brown wire = running lamps, yellow wire = left turn and green wire...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2012 Jeep Liberty
    For your 2012 Jeep Liberty you really can't beat the T-one kit part # 118554. This has the best price and is the brand that is the most reliable in our experience so it's the best option. I attached an install video for this for you to check out as well.
    view full answer...
  • Which Curt Trailer Wiring Harness Fits 2012 Jeep Liberty
    The correct Curt trailer wiring harness you need for your 2012 Jeep Liberty is the part # C56334 as the kit you tried is actually for older model Liberties and is why the connectors don't match up.
    view full answer...
  • Does Wire Need to be Ran from 2011 Jeep Liberty Battery to Trailer Wiring Harness
    When installing the Curt trailer wiring harness part # C56334 you do have to run a wire from the harness to the vehicle battery. I attached a link to a page that covers running this wire though.
    view full answer...
  • Running Power Wire to Battery of 2009 Jeep Liberty to Install Trailer Wiring Harness
    For your 2009 Jeep Liberty we offer the Curt T-Connector Vehicle Wiring Harness, # C56334 as well as the Tow Ready Custom Fit T-One Vehicle Wiring Harness # 118554. Both harnesses require running the 12-volt feed to the vehicle's battery. In testing, both Curt and Tow Ready have found that the taillights alone on the 2009 Liberty can not support the electrical draw from trailer lights. This is why the black wire must be run to the vehicle battery. With the black wire run to the battery,...
    view full answer...
  • Would Vehicle Battery Drain if Trailer Wiring Is Installed
    The Curt T-Connector Vehicle Wiring Harness # C56334 if left installed on a vehicle like your 2012 Jeep Liberty should not be draining the battery. If the 4-way connector isn't powering anything there wouldn't be any draw on the battery. That being said, if a vehicle isn't driven for a few weeks there is good chance the battery will be drained. Especially in cold weather. You might just need to put your vehicle battery on a maintenance charger like the part # CTEK56353 when you are going...
    view full answer...
  • Will the Curt Hitch 13245 Fit a 2011 Jeep Liberty Sport
    Yes, the Curt hitch part # 13245 has been confirmed as a fit for your 2011 Jeep Liberty Sport as it is a fit for all models of the 2011 Liberty. I attached an install video for this product for you to check out as well. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with...
    view full answer...
  • Troubleshooting Trailer Lights Not Working When Headlights are Turned On
    Thanks for the purchase of the Curt T-Connector Vehicle Wiring Harness # C56334 for your 2012 Jeep Liberty and from how you phrased "the only thing that works on the trailer are the running lights when my headlights are on" and the fact that you mentioned changing ground locations, it seems like the trailer lights work normally except when your headlights are on. You were smart to try and change the ground wire location to make sure it is attached to a clean, bare metal surface. Assuming...
    view full answer...
  • Will Curt T-One Wiring Harness fit 2008 Jeep Liberty without Factory 7-Way
    Thanks for your support of! It sounds like your 2008 Jeep Liberty does not have the factory 7-Way trailer connector. If this is the case, the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56334 will work well for you. This wiring harness will plug into the Liberty's existing factory wiring system, as you mentioned, behind the taillights. Since the # C56334 wiring harness has a powered converter box, you will also want to route the power wire...
    view full answer...
  • How Much Can a 2002 Jeep Liberty Tow and What is Needed
    According to the owner's manual for your 2002 Jeep Liberty, the maximum towing capacity is 2,000 lbs if you do not have the factory trailer tow package or 5,000 lbs if you do have the factory trailer tow package. If you do not know whether or not you have the factory trailer tow package you can call the dealer with your VIN and ask. In order to tow a trailer with your Jeep Liberty you will need a trailer hitch, trailer wiring harness, and ball mount/hitch ball. For a trailer hitch, I recommend...
    view full answer...
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  • Will Vehicle Wiring Harness For 2008 Dodge Nitro Work With Incandescent and LED Lights?
    The vehicle wiring harnesses confirmed to fit your 2008 Dodge Nitro, the Curt # C56334 and Tekonsha # 118554, will both work with incandescent or LED lights and neither will damage the module. Between the two I recommend the Tekonsha # 118554 because in our experience we have heard great seen them last longer and be more reliable that other manufacturer's, and as such they have become a favorite of our installers. I included a video of the # 118554 being installed for you to take a look at.
    view full answer...
  • Troubleshooting a Curt Wiring Harness on a 2011 Jeep Liberty
    So far you have eliminated the trailer and ground from what could possibly be wrong with your setup. The first thing I would do if you have not already is just remove t-connectors and then push them back together just to make sure they are making good contact. Hopefully it is just a situation where the terminals are just not making good contact. The next thing I would check is for the correct voltage on the input side of the convertor box. I would recommend using a circuit tester like...
    view full answer...
  • Wiring and Hitch Recommendation for a 2012 Jeep Liberty
    Both of the products you referenced are confirmed to fit your 2012 Jeep Liberty. The Curt T-Connector Vehicle Wiring Harness # C56334 will fit and would be the correct harness for your vehicle. I attached the install instructions for this product for you to check out. The Draw-Tite Hitch # 75578 that you referenced is also the correct hitch and I attached an install video for this product also. To complete your towing setup you may also be interested in a etrailer Ball Mount kit # 989900....
    view full answer...
  • Tools Needed to Install Curt # 13245 Class III Trailer Hitch on 2008 Jeep Liberty
    The Curt Class III hitch, part # 13245 would require a ratchet, an 18 and 19mm socket and a torque wrench. If you click the provided links, you can see the install instructions and a video showing the hitch being installed on a 2008 Jeep Liberty. If you'll be using the hitch for towing purposes, you'll also need the following to complete your towing set-up: Trailer wiring harness w/ 4-pole trailer connector, part # C56334 Ball mount, part # C45030 1-7/8 inch trailer ball, part # 19261...
    view full answer...
  • Parts Needed to Tow Small Trailer With 2004 Kia Optima
    You definitely could install the Curt hitch part # C11216 as long as you have basic hand tools and mechanical skills. The other components you need are a trailer wiring # C56334, a ball mount # 3593, and a hitch ball # 19256. Your vehicle has a 2,000 lb capacity so a trailer in the weight you mentioned would not be an issue.
    view full answer...
  • Will 7-Way Need to Run Power Wire to Battery to Use Curt Echo Brake Controller on 2011 Jeep Liberty
    We can get you squared away, and in regards to the power wire, even though your 2011 Jeep Liberty has the power wire of the Curt T-Connector Vehicle Wiring Harness # C56334 run to the battery, you do indeed need to run the 12 volt power wire to the battery to connect the 7-way of the upgrade kit that is used for the Curt Echo Wireless Trailer Brake Controller # C51180: - 7-Way RV Upgrade Kit for Trailer Brake Controller Installation # ETBC7L Now, as for the charge, a 7-way will only...
    view full answer...
  • Comparison of Wiring Harnesses to Fit 2011 Jeep Liberty and Other Parts Needed to Tow a Trailer
    There are three trailer wiring harnesses that fit the 2011 Jeep Liberty. The Tekonsha # 118554, Curt # C56334, and a Hopkins # HM11142485. All three provide a 4-way connector and install by plugging in behind both tail lights. There is also a hot lead wire that will be run to the battery and a fuse to be installed. Everything for the install is included with each harness. Then the connector will is stowed beneath the Jeep near the trailer hitch. Of the three I recommend the Tekonsha...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Cole B
Installed by:
Cole B
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

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