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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 # C56321
Retail:$135.95
Our Price: $75.97
You Save: 44%
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 C56321 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 (121)
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CURT Custom Fit Vehicle Wiring - C56321

  • 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 driver's-side tail light and rear bumper
    • 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: 7.5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • Limited 1-year warranty


Installation

This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind your driver's-side tail light and behind your rear bumper on the driver's side. You will have to remove the plastic cover behind your bumper, trunk floor coverings, rear scuff panel, trim panel, and tail lights 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.



56321 Curt T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Installation Details C56321 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 - C56321

Average Customer Rating:  4.8 out of 5 stars   (121 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:

This wiring harness is the perfect compliment to my Curt hitch receiver. I love the length of the cable and it stays tucked away into the spare tire compartment in the rear portion of the vehicle.



by:
2018 Kia Sportage

Perfect fit with no splicing or cutting! A definite must have if you are adding a new hitch to your Sportage!2018 Kia Sportage



by:

Easy to install.Kit was very complete.I think the power wire to the battery should be copper but it's no Bing deal.I took a little extra time to run the power wire under the protective tubing panel (4 small bolts to remove panel).I'm a 77 year old retired mechanic but the install took 2.5 hours and one cold beer!



by:

It seems to be a well made kit, although the double sided mounting pad for the controller was dried out and useless. It must have been on the shelf for awhile.
Installation went well, and the video on this site was very helpful.
I did go a bit further, and used Noalox Anti-Oxidant Compound in the crimps and covered them with heat shrink tubing.



by:
2021 Kia Sportage

Amazing customer service and shipping timeliness! Quite impressed!



by:

I haven't installed it yet, but I must say that between the youtube installation video and the enclosed directions it seems pretty easy



by:

The wiring harness was well put together and easy to install. The instructions provided were a little difficult to follow, but a quick online search on the web site and a video later and I was on my way to a finished product.



by:

The wiring harness fit perfectly and the direct plug adapters made the job simple and quick.



by:
Kia Sportage

The wiring harness worked perfectly and I've been using my Sportage to pull trailers all over town. Working with etrailer.com was quick and easy. Thanks.



by:
Kia

After purchasing a new Kia Sportge last year from on the sales lot I was unable to obtain a hitch or light hook-up from them. I was able to get a hitch installed locally--but still no luck on lights--imagine Kia not having access to these services!! So I went on line & easily found the etrailer.com website. I had no problem finding the exact kit for my year & model Kia--it was shipped promptly & I had the same business install it that did the hitch. Thank you etrailer!! (this review from a "senior" female not too computer or vehicle savvy!!)

Barbara

3/13/2019

No problems- wiring kit was installed by a local trailer business & has performed with no issues. Thanks for the follow-up



by:
2017 Kia Sportage

Comprehensive kit. Wish the instructions were a bit more detailed for my vehicle, i.e. "Remove taillight screws" but didn't mention that there is a cover on the taillight that covers acces to the screws. Just showed the taillight with the cover removed. Not a huge deal, but it can be difficult sometimes to remove these things when you are afraid of breaking something on your new car. Everything else came together well.

Vanb

4/7/2018

Everything is great! Thank you.



by:

Needed replacement, sent in defective part and received a new one no charge.



by:

Easy install, very complete & professional kit with effective instructions. The video link mirrored the instruction and was informative on a few of the finer details. 2 hour install for me, that included letting the black silicone setup. Running the power wire to the battery is a pain in thebutt without a lift, but very doable.

George

6/14/2022

After one year of service, its still performing as when new. Highly recommended product.



by:
2020 Kia Sportage

Received the package today. In these days of mediocre or no service, I was extremely happy with the speed of the order. Just hours after placing the order I was notified it had shipped. The map showing where it came from and the destination was a nice touch. Good quality product that I will install on my 2020 Kia Sportage. Thank You

Bill S.

4/24/2021

Plug in broke while I was on the road. I had to buy a new harness at a parts store and rewire it myself in order to continue on my way and have lights on my tear trailer

Sierra K.

4/26/2021

Thank you for your review. Putting the plug in a safe location on your vehicle is important. We have mounting brackets to hold wiring harnesses up and out of the way of harm or you can simply zip tie your harness on your hitch receiver making sure there isn't excess slack.


by:

We have only used it about 8 times but it has worked great



by:

Amazing product. Very easy to follow the step by step video on etrailer.com everything easily plugs in and is out of the way. No cutting into the existing harness. It's amazing



by:
2017 Kia Sportage

I successfully installed the Curt wiring harness a couple days ago. The etrailer videos and instructions were excellent and invaluable to me. I did find it challenging to fish the 10 gauge power wire from the rear bumper area to the battery. etrailer installation photos were excellent also. I'm waiting for the Curt connector tester I ordered yesterday to check out the Curt wiring system before I rent any trailers.



by:
2018 Kia Sportage

Great product web site and delivery time



by:
2017 Kia Sportage

Hitch installation was easy. The wiring was more challenging but no splicing and the instructions guided us through the whole process. Hitch and lights both work great and have had no problems at all since installation.



by:
2018 Kia Sportage

I needed to wire my Kia Sportage for a trailer. The dealership wanted to charge me 250 bucks for the wiring harness. I checked online to see how hard it would be. etrailer had a video showing their product and its EXACT installation. Part numbers, How to on my vehicle. And 65 bucks. It was EXACTLY as they showed. Down to every screw.



by:

Super easy to install, I didn't run into any issues at all. The directions were straight forward and I do love the fact that its all direct plug. I have had this wiring harness for a year now and its still running strong. I am very please with the product.



by:

Spoke with Shawn B on the phone and within just a few seconds had clarification on the wiring I needed. She was awesome, friendly and courteous. The wiring harness fits perfectly, easily wired and was easy to complete. A plug and play harness. I'm very pleased with my purchase, the cost was less than at other places and there was free shipping! What else do you need?!



by:
2021 Kia Sportage

Curt T connector wiring kit arrived with the hitch(gave review for hitch already). Watch and followed video for installing wiring kit. Had no problems, great instructions. I went extra slow because I am not much of a wiring guy.



by:
2019 Kia Sportage

Tried to edit my previous review, but could not find it. Just had to write another saying etrailer fixed my product issues, Although they didnt email me letting me know they did. Was left in the dark as far as if my hitch was going to be replaced, but in the end a new one showed up today.



by:

put trailer together but one air hindge wasent good so requested a replacement and they were very respectful, we recieved it in a timely manner and are satiisfied .. would order from this place again.


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

  • Parts Needed for 2021 Kia Sportage to Tow Trailer With Electric Brakes
    The Curt T-Connector Vehicle Wiring Harness # C56321 will only allow you to power your trailer's signal lights. If you want to tow a trailer with electric brakes using your 2021 Kia Sportage you will need to add a 7-way and a brake controller in addition to the 4-way connection. The first thing you need to do is add the 4-way. I recommend the Tekonsha # 118698 over the Curt since we have found Tekonsha to be the most reliable when it comes to wiring. Once this is installed you will need...
    view full answer...
  • Will Curt Trailer Hitch FIt 2020 Kia Sportage
    Yes, the Curt # C13281 will fit your 2020 Kia Sportage. If you would prefer it in matte black the # e72TR will also fit. These share the same design with the only difference being the finish. If you plan on towing you will also want the # C56321 for 4-way wiring and the # C45534 for a ball mount.
    view full answer...
  • Why Does Trailer Wiring for 2019 Kia Sportage Wire up to Vehicle Battery
    All of the trailer wiring harnesses for your 2019 Kia Sportage require running the power wire up to the vehicle battery. While this makes for a more involved install it does allow your vehicle to have more circuit protection and you'd never have to worry about a trailer wiring short causing damage to your vehicle wiring. This is because the harness draws power from the vehicle battery and not the vehicle taillight circuits.
    view full answer...
  • Does Curt Trailer Wiring for 2022 Kia Sportage Affect Reverse Camera
    The Curt trailer wiring harness part # C56321 that fits your 2022 Kia Sportage does not affect the reverse camera at all. It would function exactly the same as it is now.
    view full answer...
  • Recommended Trailer Hitch for a 2020 Kia Sportage
    The trailer hitch I recommend for a 2020 Kia Sportage is the etrailer Hitch part # e72TR. The etrailer Hitch offers a complete bolt-on installation with no cutting/drilling or special tools involved therefore no permanent modifications are required. This is certainly something you can install at home, in your driveway without much effort as it only takes most on average around forty minutes or so. This Hitch has a concealed cross tube so the only part that is visible will be the receiver...
    view full answer...
    Image 1 for
  • Recommended Trailer Wiring Harness for a 2022 Kia Sportage
    The trailer wiring harness that I recommend for a 2022 Kia Sportage is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56321. This harness is a direct plug-in-play fit with no cutting or splicing required. It provides a 4-pole connection which is the most common type and used on most trailers without brakes.
    view full answer...
  • Will the Curt Trailer Hitch Receiver # C12158 Fit Both the 2017 and 2020 Kia Sportage?
    The Curt Trailer Hitch Receiver # C12158 is confirmed to fit all trim levels of the 2017-2021 Kia Sportage. If you are transferring this hitch from a different vehicle I recommend using new hardware. The Replacement Hardware Kit for Trailer Hitches # RHK will allow you to order a new set of hardware specific to your hitch. Both the Curt T-Connector Vehicle Wiring Harness # C56321 and Tekonsha T-One Vehicle Wiring Harness # 118698 will also fit the 2020 Sportage if you are needing to transfer...
    view full answer...
  • Parts Needed To Tow A Trailer With Brakes With A 2022 Kia Sportage
    In order to tow a trailer with brakes you'll first need to install a 4-pole wire harness like the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56321. This will connect to your tail light wiring and allow you to transfer your light signals through to a trailer. From there you'll need to install a 7-Way # ETBC7. To activate the brakes on the trailer you'll also need a trailer brake controller. I prefer the Redarc Tow-Pro Liberty Brake Controller # RED24FR...
    view full answer...
  • Curt Class III Trailer Hitch that Fits 2020 Kia Sportage
    Curt has a similar Class III hitch that fits your 2020 Kia Sportage with the # C13281 but the # 13526 that you referenced is not a fit and would not work. I attached an install video for this on a similar 2020 Sportage as yours for you to check out. For trailer wiring you could then use the part # C56321 this is very easy to install and also very reliable.
    view full answer...
  • Are There Any Replacement Parts for the Curt T-Connector Wiring for a 2017 Kia Sportage
    If the powered module that comes on the Curt T-Connector # C56321 shorted out and now your trailer lights are staying on constantly then you will need to replace your wiring kit as there are no replacement circuit boards or modules. You can however use the Curt Upgraded Circuit Protected Powered Tail Light Converter # C56496 and just splice it in behind the converter box. If you'd rather go with a whole new kit then I recommend using the Tekonsha T-One # 118698 because we have found the...
    view full answer...
  • Recommended Replacement Wiring Harness for a 2020 Kia Sportage
    As much as you don't want to hear it there's no way to protect the converter box from bad trailer wiring. You wouldn't plug a brand new computer into an outlet that is sparking and constantly shorting out. You're going to need to fix your trailer or you'll keep frying wiring harnesses and pricey converter boxes. I recommend starting at the 4-way connector and working your way back towards your rear lights and fix every fault and frayed wire along the way. Especially check your grounds....
    view full answer...
  • Fuse Size in Curt Wiring Harness For Kia Sportage
    A 10-amp fuse is used in the Curt wiring harness that fits your Kia Sportage, the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56321.
    view full answer...
  • Comparing Tekonsha T-One and Curt T-Connector Wiring Harnesses for a 2018 Kia Sportage
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118698 is what I recommend for a 2018 Kia Sportage. In comparison to the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56321, the T-One has a different converter box which is easier to secure and more reliable (better potting). It also has an integrated dust cap as opposed to separate on the T-Connector which can easily be lost.
    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 Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee John S
Video Edited:
John S
Employee Dustin K
Video by:
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Employee Cole B
Installed by:
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Employee Chelsea B
Written by:
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Employee Wilson B
Updated by:
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Employee Kristina F
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Employee Isabelle B
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