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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 # C56079
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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 C56079 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 (116)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C56079

  • 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 in rear cargo area
    • 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 interior trim panels in your rear cargo area. 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.

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.

56079 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56079 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 - C56079

Average Customer Rating:  4.9 out of 5 stars   (116 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.


Good product, easy installation, works great.


Wanted to be safe driving on I-95 so with bike on carrier the brake-turn signal lights were partially blocked. Fishing the wire from the trunk to the battery was a little tough on a creeper but it worked out. Everyone says how visible the lights are, so we feel safer.

Toyota Venza

Straight forward install, watch the video for sure. Looks good on the Venza.

2011 Toyota Venza

I used the etrailer online video to walk me through the installation of the above wiring harness on my 2011 Venza. The whole process was relatively staightforward since the video was specific to my vehicle and the instructor explained everything in minute detail. The local Toyota dealership wanted $150 to do this install, and I was able to zip tie the power wire under the chassis to reach the battery terminal without lifting the car. Mission accompished!

I like the fact that the trailer connection is stored inside the car by the spare tire. I see other connectors dangling loose outside of the car a lot.
John - 04/21/2019


Everything installed as explained, no i ssues.

2013 Toyota Venza

Reviewed install video, easy install, perfect fit. Thanks.

Working perfect
JERRY R - 09/23/2021


Works great, instructions need to be be tter.


Ordering the product was easy and it arrived on time and in excellent condition. Easy to install, product works well and we are very happy with it.


I was nervous about the installation but following the YouTube video made this an easy project. Especially like that I didn't have to cut or splice any wires. Has performed as expected since installation.

2011 Toyota Venza

Excellent purchase experience. Website is great. The installation videos were excellent and accurate. I did the hitch installation alone with the car on jackstands. Took about an hour. Everything fit perfectly. Great not to have to adjust anything. The wiring kit took about two hours to complete. About an hour to get everything in the back and about an hour to install the wire to the battery. Was able to put the car on a lift for the battery wire. That would not have easy on stands. Haven't towed with it yet, but expect that everything will work as it should.

I am pleased with the hitch and wiring harness. I recently used them to tow a U-haul trailer loaded with a motorcycle from Colorado to Arkansas. Both products worked flawlessly.
James L - 01/28/2019

2009 Toyota Venza

Asked a neighbor for help and had the new hitch installed in less than 5 minutes. Too easy, outstanding fit, great look and fits my needs.

Wiring harness took about 1 hour and spent most of the time finding the right holes to fish the wiring harness through.

A good buy for a fair price.

craig h - 09/08/2017


Easy to install. Kit was complete. I drilled through my frame and hid the wire under my car.

2015 Toyota Venza

Received my hitch and electrical wiring kit within 4 days of placing my order. I installed the hitch and wiring kit on my 2015 Toyota Venza in a couple of hours using the information and videos available from the website. Everything went together as advertised and I am very happy with the results.


Item description as pictured clear instructions easy install quick shipping

2010 Toyota Venza

Delivery was quick even with it being just before Christmas, I had expected it to arrive after the Christmas break. I'll get to do the installation over the next couple of days, thanks for the speedy response. I had an old unit off my Lexus but found it had six pin connections at the splitter points near the lights so had to revert to ordering this four pin version. The old one was an easy install so I'm sure this one will go the same way, the Curt product are very good quality and fit as per their on line videos.

Great, no trouble on the install or since while using it.
Mike S - 12/24/2017



2015 Toyota Venza

My husband installed this for me. I know that the wire running to the battery is a pain, but I didn’t get any bad feedback from him. He is a gear head though so he knew what to do. I also know he watched the video first, so I recommend that as well. Very satisfied, especially since it would have cost me about $185 if I took it somewhere

Product is working great. I haven’t had any issues or concerns.
Mary - 08/22/2019

2014 Toyota Venza



2013 Toyota Venza

Excellent fit, quality 2nd to none! Instructions are easy to follow. All plug & play.

Used hitch to move from OH to ME. 1400 miles with a 3000lb Uhaul trailer! And it has come in handy for utility trailers because I dont have a truck. I like that the harness stays inside near the spare tire until needed because it doesnt get all full of dirt and that annoying green corrosion that blows fuses. I still like it alot. I also like the way it looks. It fits up inside the bumper so its mostly hidden, and it looks like a factory installed hitch.
Edward - 02/16/2019

2013 Toyota Venza

I found myself in a place where the need for a pick-up or a trailer was in order, since i really like my 2013 Toyota venza i chose the later, after shopping on line i thought this looked to meet my needs i have the ability to tow 3500lbs with 500lb tongue weight, so the package showed up in 2 days and i was able to do the install in about 40 minutes , it was as easy as they said it would be, i did need help from my son with balancing the thing, but everything lined up perfectly, the electrical was another story, since you need to basically disassemble the entire rear interior of the vehicle to connect the wiring harness,(ford looks super simple)but the connections worked perfectly and the straps provided were plenty, and the whole thing after it was done looks high and tight, i like it.


Worked perfect-Instead of running wire up to battery, I hooked to interior light on left side(The customer was only towing Waverunner with LED lights that use very little current-knocked half hour off install...


It worked. (I've only used it once.)

was easy to install and (if I remember correctly since it was a year ago) the directions were clear and I had no issues.

I had a trailer hitch for a platform attachment but no electrical connection. My daughter needed a few pieces of furniture picked up at various locations. I needed to rent a trailer and needed the light hook up so that is why I bought it.

2013 Toyota Venza

Great service and products quality. Fast shipping too.

2012 Chevrolet Volt

Install of both trailer hitch and wiring harness went very smoothly. Total install time for both items to me 1 hour 47 minutes and that included watching etrailer’s online video. The most time consuming part of the install was routing the 12 volt power wire from the spare tire compartment to the battery. Everything was well designed for a do it yourself person at home.


Trailer wiring it's a done in less than two hours without lifting the car. ( I have a couple phone calls on the time ) I'm so happy with video on YouTube and make me so easy to install the wiring.
I did not install the hitch yet but I think that's going to be more easier.
Thank you for a good product and fast shipping

Show More Reviews

Ask the Experts about this CURT Custom Fit Vehicle Wiring

  • Do Trim Panels have to be Removed to Install Trailer Wiring on a 2011 Toyota Camry
    The Curt trailer wiring harness # C56079 plugs in line with the vehicle tail light wiring so if you can access the connectors at the back of the tail lights without removing any panels then that is fine as long as it is installed correctly. I have linked the instructions for you. This harness also requires a direct connection to the vehicle battery to power the trailer lights. This is done so that the sensitive wiring on the vehicle is not overdrawn which could damage it. I have included...
    view full answer...
  • Hitch and Wiring Recommendation for a 2014 Toyota Venza
    I checked with Curt and the Curt Wiring Harness part # C56079 that you referenced is confirmed to fit your 2014 Toyota Venza. For a hitch I would recommend the Curt Hitch part # 13356. For ball mounts I recommend the etrailer Ball Mount Kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with clip, and a carrying bag.
    view full answer...
  • Does a 2013 Toyota Venza Take the Same Trailer Wiring Harness as a 2009 Venza
    Yes, the 2013 and 2009 Toyota Venzas use the same trailer wiring harnesses so the one from your 2009 would work in your 2013. If you have the Curt Wiring Harness part # C56079 that you referenced this would work well on either vehicle.
    view full answer...
  • How to Route the Power Wire of a Powered Taillight Converter
    This is a pretty common question we get. So common in fact, we made an FAQ article that covers all the different options for routing the power wire of a powered taillight converter like the part # C56079. I attached it to the right for you to check out.
    view full answer...
  • Is a Battery Connection Required when Installing a Trailer Wiring Harness on a 2012 Toyota Venza
    The Curt trailer wiring harness # C56079 does require a direct connection to the vehicle battery. This is what will power the trailer lights. It is designed this way to protect the sensitive wiring on the vehicle from any shorts that could end up damaging the vehicle wiring and/or electrical components. The connection has to be made at the battery and not any other location because the harnesses have not been tested for use from an alternate power source. While there is power that runs...
    view full answer...
  • No Trailer Lights After Installing Curt Wiring Harness on 2011 Toyota Venza
    I'm guessing where you grounded the Curt # C56079 isn't sufficient. It could be grounded well enough to light up your test light, especially if it's an LED tester, but not enough for the actual trailer lights. I'd start by moving the ground location to something more secure than the exhaust like the vehicle frame. Making sure the location is clean and bare metal as well.
    view full answer...
  • Is Trimming Required to Install Trailer Hitch on a 2013 Toyota Highlander
    When installing a trailer hitch like the Curt part # 13534 on your 2013 Toyota Highlander you can either remove the lower fascia panel or trim it so that the hitch will fit easily. I attached a picture that I took from the instructions that show the trimming needed too.
    view full answer...
    Image 1 for
  • Trailer Left Tail Light is Not Working After Installing Trailer Wiring Harness on 2013 Toyota Venza
    There is no difference. Harness # C56079 is the part number we give the harness to indicate it is a Curt product. The manufacturers number for the same part is 56079. You can test the 4-Way end of the harness to determine if the problem is with the harness or the trailer. Use a circuit tester such as # 40376 to test the pin that is right next to the one exposed pin. If you have power there then the issue is on the trailer likely a bad ground. Ground problems normally show up when there...
    view full answer...
  • Intermittent Turn Signal Enters Converter Box But Constant Turn Signal Leaves Converter Box
    I did not catch what vehicle you have nor what wiring harness you are using but if you are testing the turn signal wire going into the converter box and getting the correct intermittent signal but are receiving a constant signal leaving the converter box on the turn/brake signal wire then this points to signs of a faulty converter box. If this is the case then the wiring harness will need to be replaced. For replacement, I recommend using the T-One Vehicle Wiring Harness with 4-Pole Flat...
    view full answer...
  • Does Wiring Harness for 2018 VW Tiguan Require Power Wire to Battery
    The Curt T-Connector Vehicle Wiring harness # C56403 that you referenced, which is confirmed to fit your 2018 VW Tiguan, does indeed require that a hot lead be run to the vehicle's battery. This is the case for the other harness that is available for your Tiguan as well. The reason for this is that the wiring system on your particular vehicle requires a powered converter to safeguard the factory wiring, decipher the signals of its multiplexed circuits, and better support the trailer lights...
    view full answer...
  • Why Does Trailer Wiring for 2017 Toyota Sienna Require Running Wire to Vehicle Battery
    Trailer wiring like the # C56106 that you reference attaches to the vehicle's battery directly as a way to bypass all of the vehicle's delicate wiring circuits to draw power for the trailer's wiring. If you ran the power wire to a circuit on the fuse box you'd no longer have the circuit protection and potentially could damage your vehicle. I know it's kind of a drag to have to run a wire all the way back from the rear of your 2017 Toyota Sienna to the vehicle battery but it's the safest...
    view full answer...
  • Recommended Hitch and Wiring Harness for 2015 Toyota Venza
    For your 2015 Toyota Venza the hitch I recommend for you is the Curt # 13356, which is a very popular hitch for your vehicle and our customers who use it have given it a nearly unanimous 5-star review. This is a 2" hitch with a towing capacity of 3,500 lbs and a tongue weight of 350 lbs so you will have no problems using any type of bike rack. I've added a photo of a customer who is using it with a 4-bike Thule rack so you can see how your set up might work. The wiring harness you'll want...
    view full answer...
    Image 1 for
  • Differences Between Curt T-Connector # C56079 and TowReady T-One # 118482 Wiring Harnesses
    Both the Curt T-Connector # C56079 and TowReady T-One # 118482 wiring harnesses are no-splicing custom-fit plug in trailer wiring harnesses for the 2010 Toyota Camry. Both will install the same way (and an article on routing the harness power wire and an install video are linked to help you with this process). The main difference between these two harness if their current output capacities. The TowReady harness has a maximum current (amperage) rating of 2.1 amps per stop/turn circuit and...
    view full answer...
  • Will Curt Hitch # 13356 Fit on a 2016 Toyota Venza
    I checked with the manufacturer and the Curt Class III Hitch # 13356 and the Curt T-Connector Wiring Harness # C56079 are both confirmed to fit your 2016 Toyota Venza LE AWD. I've linked an install video for the wiring harness for you to use as a reference. If you need a ball mount and hitch ball, the Curt Class III Ball Mount and 2" Hitch ball # C45036 can complete your towing package on your 2016 Venza.
    view full answer...
  • Is an Aftermarket Trailer Hitch and Wiring Harness Different than an OEM Trailer Hitch and Harness
    You will often pay inflated prices at car dealers. There is really no difference between the trailer hitch and wiring harness that Toyota offers for your 2009 Toyota Venza than the Curt Trailer Hitch, # 13356, and the Curt Trailer Wiring Harness, # C56079. All trailer hitches must pass specific tests whether they are OEM or aftermarket. In fact, Curt is in the OEM market as well as the aftermarket. Curt manufactures trailer hitches for a few different vehicle manufacturers. All of their...
    view full answer...
  • Ball Mount Installed in 2014 Toyota Venza Factory Hitch Fits Loosely
    Sometimes factory-installed (OEM) hitches can have slightly different dimensions and tolerances than the aftermarket products from companies like Draw-Tite, Hidden Hitch, etc. As long as you are using the correct 2-inch size ball mount in your 2-inch factory hitch you can address your fit concern with an anti-rattle device. The linked page will show you all such products that will fit your 2-inch hitch. These are offered in both locking and non-locking types. For a locking anti-rattle...
    view full answer...
  • Installation of Curt C56079 Trailer Taillight Wiring Converter on 2010 Toyota Venza
    Thank you very much! I'll pass that along to our video and install crew. The best way to make that wiring run from the rear of the vehicle up to the battery would be to locate and follow an existing wiring harness under the vehicle, and zip tie the taillight converter power wire to that every couple of feet. You'll want to be sure to avoid anything moving or hot like suspension or exhaust components. If you drive on gravel roads quite a bit, you might also consider a length of wire loom...
    view full answer...
  • Moving Trailer Hitch and Wiring From 2009 Toyota Venza to 2011 Toyota Venza
    Your Draw-Tite Class III Max Frame Receiver Hitch # 75663 does fit both the 2009 and 2011 model Toyota Venza. You will definitely want to use new hardware for installation and the easiest route to take for this is to order part # RHK. Once on this product page simply type the part number in the text box provided (75663) and select Draw-Tite from the manufacturer drop-down menu. We will then send out the complete hardware kit for this particular hitch on your vehicle. The hardware for...
    view full answer...
  • Trailer Hitch for 2011 Toyota Camry XLE Non-Hybrid
    For the 2011 Toyota Camry non-hybrid version we offer a 1-1/4-inch Class II hitches from several manufacturers and you can see all on the linked page. I recommend the Curt # C12343 because it costs less than the other options and because it requires no drilling for installation. An installation video and the written instructions are linked for you. The only special tool required to install the hitch is a torque wrench like # ALL944001. If you also need a 4-pole trailer wiring harness for...
    view full answer...
  • Parts Needed for Towing a Small Trailer with a 2011 Toyota Camry LE
    I will be glad to help you make sure that you picked everything out correctly. The Curt Trailer Hitch Receiver # C12343 is a great option for your 2011 Toyota Camry LE and is compatible with the Curt Class II Drawbar # C45521 that you chose. The Curt 2" Hitch Ball # A-82 has the same shank diameter as what the ball mount does so they will work well together. The only thing missing is a hitch pin and clip like part # F-4 unless you wanted a locking hitch pin like part # 5200 instead. You...
    view full answer...
  • Parts Needed For Towing Setup For 2012 Toyota Venza For Towing Pop-Up Camping Trailer
    You have done your homework and have almost everything you need. For your complete towing setup, you will need: Item # 13356 - Curt Hitch (confirmed fit for your 2012 Venza) Item # C56079 - Trailer Wiring Item # ETBC7 - 4-Way to 7-Way Universal Installation Kit for Brake Controller Item # TK94FR- Prodigy RF Wireless Trailer Brake Controller Item # 18159 - Mounting Box (optional, mounting bracket included in Item # ETBC7) Item # 989891 - Ball Mount Kit (Includes: 1 fixed ball mount, 2...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Joshua S
Video Edited:
Joshua S
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 Matthew S
Test Fit:
Matthew S

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