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  4. Trailer Hitch Wiring
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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 # C56251
Retail:$146.95
Our Price: $81.82
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Custom Fit Vehicle Wiring

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Shipping Weight: 1.88 lbs
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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 C56251 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 (31)
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CURT Custom Fit Vehicle Wiring - C56251

  • 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 - no cutting or splicing of wires
    • Locate connection points on the driver's-side, behind the tail light and beneath the vehicle
    • 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 on the driver's-side behind the tail light and beneath the vehicle. You will have to remove all cargo area floor coverings, storage trays, and the scuff panel to access these connection points. 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.



56251 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56251 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 - C56251

Average Customer Rating:  4.7 out of 5 stars   (31 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:
2014 Kia Sportage

This wire kit was pretty easy to install; the directions were very detailed and accurate. The only issue I ran into was there is a point in the instructions where you're running wires through a grommet that is way too small for the connectors and the instructions reference a new grommet that is not part of the kit. I just cut the old one to fit the new wires th through the side and it was all good. Routing the 12v wire was pretty simple; I had my car backed up on a pair of ramps and ran the wire along the brake and fuel rail on the driver side under the car. I punched this one up through that grommet too to plug in at the module. I don't use butt connectors; I always solder and heat shrink. Personal preference. In all, this was a straight forward and simple install.

Flash

11/1/2017

The hitch and wiring are still going strong! Ive had no issues at all.



by:

Installed the lighting kit when I installed the trailer hitch. The wiring harness worked perfectly and made pulling the trailer a breeze.



by:
2011 Kia Sportage

The process of installing the Curt T-Connector Wiring Harness for my 2011 Kia Sportage went very well. I knew it would take quite a bit of time because of all the removal of the tail light, inner panels, etc. However, it is worth the time because of end result - a system that works, and appears almost factory installed. I highly recommend this product.



by:
2012 Kia Sportage

I love buying stuff from Etrailer.com. The listed products are the exact fit for my vehicle. The on line instructions make it very easy to install. I installed the hitch and wiring harness in just under 2 hours. I will buy stuff from this site again



by:

Worked as expected. A little difficult to install, even after watching the installation video.



by:

Would have loved to have had a grommet made into wires on t connector that goes through trunk pan, down to factory harness that goes to left rear tail light.
Would gladly have spent a few more dollars for that bit to be pre made than having to cut the grommet and then patch it with the rtv sealant.
Besides that, install went very well.



by:
2012 Kia Sportage

Wow, great super fast service. Impressed , Thank You



by:

Easy to install. Instructions need to be slightly modified for the 2016 model year.
Missing replacement rubber grommet that was supposed to be included in the kit, otherwise okay.



by:

The wiring system worked exactly as described and the video guide was very helpful. Other than a few rusted bolts on my vehicle I installed the system with no issue and so far it has function and worked well within my expectations for a full year. Great product.



by:
2014 Kia Sportage

Arrived as scheduled. Package contained all necessary parts and in good condition.
Very pleased with the product . Harness was easily installed and works great. Glad I found this company



by:
2016 Kia Sportage

Arrived sooner than expected. Haven't installed yet but looking over instructions appears they appear clear and easy to follow for me not having much knowledge on wiring anything. Great follow up with notification from etrailer. Install will hopefully be tomorrow.



by:

Fit perfectly and as expected. Installation was a little challenging but the walk-through was very concise. Thank you. I will definitely order from etrailer again in the future.



by:

No harder to install than any other wiring kit fit perfectly instructions were great.



by:
2015 Kia Sportage

looks like everything is there but box was damaged and hitch was sticking out



by:
2016 Kia Sportage

Wiring product was good but missing the grommet for the 2016 Sportage. Other then that pretty self explanatory

Kevin S.

2/20/2018

Love your products. It is the only hitch I will purchase and your wiring kit was fantastic. I work at different campgrounds around the country, mainly east coast but I tell everyone about your products. Thanks for making products that actually fit and do what what consumers pay for. Love your stuff.



by:
2015 Kia Sportage

Piece of cake install. 76 years old and did it right my myself.
My mantra: "I've done so much with so little for so long right by myself till I can do almost anything with nothing when I'm not even there."



by:

Wiring was simple and easy to install



by:
2015 Kia Sportage

Great customer service!



by:

Wonderfull web based support. Great attention and very polite attentive service



by:
2016 Kia Sportage

Said the part was in stock and would be delivered within the week, ended up taking over a month.



by:

All your product are well explained. I love the videos. Help out HUGE! It helps because so many makes and models. Give you a little idea of what you will encounter on the install.



by:

Still working great, no problems, easy install.



by:
2011 Kia Sportage

Easy to install and works great so far.



by:
2016 Kia Sportage

Everything came in one box. Great site to grab everything in one spot. Will order again.



by:

Wiring was easy for a DIY and worked Totally as Advertised.


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31
Show More Reviews

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

  • Recommended 1-1/4" Hitch for a 2012 Kia Sportage SX
    Yes, it will! The Draw-Tite Hitch item # 36510 is confirmed to fit the 2012 Kia Sportage SX models with dual exhaust. Our installers have stated that the hitch comes in contact with the exhaust on the SX turbo models. This may result in the exhaust hangers needing to be bent to get the right amount of clearance. Other then that this hitch is custom fit and comes with all necessary hardware to complete the installation. The Draw-Tite Hitch item # 36510 is a class II hitch with a 1-1/4"...
    view full answer...
  • Troubleshooting Parking Lights Not Working With Curt Wiring Harness Installed On 2013 Kia Sportage
    I am sorry to hear you are having an issue with the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56251 installed on your 2013 Kia Sportage. Since only one function was not working with the harness installed, I recommend double checking that all of the pins in the connector that plug into to the factory driver side connector are not bent causing a the connection to not be complete. Also make sure that the connector clicks in to the factory connector. If...
    view full answer...
  • Could Converter be Bad of Curt 4-Way For 2016 Sportage
    Hey Paul, thanks so much for the purchase from etrailer of the Curt T-Connector # C56251 for your 2016 Kia Sportage. It isn't going to be the converter that is bad if just the turn signals don't work. It could be the ground being bad; make sure the ground to the driver side light is attached to bare metal surfaces and free of any paint, dirt or corrosion. Also check both your vehicle and trailer connectors for corrosion, which can be green or white in color - a build-up of corrosion can...
    view full answer...
  • Troubleshooting Turn Signals After Installation of Curt 4-Pole Wiring Harness C56251 in Kia Sportage
    Thank you for your wiring harness purchase. The Curt 4-pole wiring harness kit # C56251 is a custom-fit product confirmed to fit your 2012 Kia Sportage. Since this installs using connectors that match those on the car there really is no wiring diagram per se, but the instructions are linked for you. Only the one power wire to the battery requires a spliced connection; this goes to the positive terminal via the included fuse holder. You do not mention whether it is the vehicle or trailer...
    view full answer...
  • Will the Curt Trailer Hitch Receiver # C13120 for the 2014 Kia Sportage Also Fit the 2015 Model
    I spoke with my contact at Curt and the Trailer Hitch Receiver, # C13120, for the 2014 Kia Sportage has been tested and it is also a fit for the 2015 model. This hitch has a tongue weight capacity of 350 pounds and a towing capacity of 3,500 pounds. Please keep in mind that Curt does require all non-trailer loads like bike racks and cargo carriers to be supported with a Trailer Hitch Support Strap, # 18050. Failure to properly support these loads will void your hitch warranty from CURT. As...
    view full answer...
  • Recommended Trailer Hitch and Towing Accessories for 2012 Kia Sportage SX
    We'd be happy to help! Although the Draw-Tite # 75717 would fit for you, we'd recommend going with a US made product like the etrailer brand Class III hitch, part # e84KR. The hitch is compatible with the SX trim. If you'll be towing with the hitch, you'll also need a trailer wiring harness like # C56251. For a ball mount, use # D-28 and for a trailer ball, use # 40038 for a 2 inch ball or # C40002 for a 1-7/8 inch ball. I've linked to some install videos that you might find helpful.
    view full answer...
  • Lighted Hitch Cover Remains On with Vehicle Lights Off
    A lighted hitch cover such as # CR-007 uses the same type of 4-pole wiring as a trailer that has basic lighting functions. This type of wiring set-up provides brake, turn and tail light functions. This 4-pole wiring harness, such as # 118526 and # C56251, will pass a very small amount of power even without any vehicle lighting functions activated. If you have a hitch cover that uses highly efficient LEDs instead of bulbs, like # CR-017, it may illuminate just from the small amount of residual...
    view full answer...
  • Curt Trailer Hitch and Wiring Harness Fits for 2016 Kia Sportage
    The correct Curt 2-inch Class III hitch for the 2016 Kia Sportage is part # C13120. This also fits the 2015 model year. This Curt hitch comes complete with all required installation hardware. I have linked the written instructions as well as an install video showing a 2015 model year. The only specialized tool needed is a torque wrench like # ALL944001 which will let you tighten the fasteners to the correct torque values. If you plan to move the hitch from one vehicle to another please...
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Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Adam R
Expert Research:
Adam R
Employee Cole B
Installed by:
Cole B
Employee Chelsea B
Written by:
Chelsea B
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee David F
Test Fit:
David F
Employee Clayton O
Test Fit:
Clayton O

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