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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
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 # C56131
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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 C56131 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.
  • All Info
  • Reviews (6)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C56131

  • 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
  • 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: 7.5 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located in your rear cargo area. To access this harness you will have to remove the rear scuff panel and some interior trim.

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.

Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. 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.

56131 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56131 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Video of Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Curt Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C56131 Review

Today we're reviewing part number C56131 from Curt. This is a T-connector vehicle wiring harness with a four holeflat trailer connector.It's made specifically for your 2011 through2012 Kia Forte hatchback and it's an easy way to provide power to your trailer foryour signal lights and your tail lights. Here's the four pole that goes to your trailer and it comes with a dustcapto protect it when it's not in use. Youalso canstore this in theback of your vehicle when it's not being used for towing. Start your installation on the driver's side. The driver's side wires are those with the long, yellow wire included and aground wire included. Find your wiring harness on the driver's side in the back of your vehicle and disconnect thewiring harness andthen plug these two white plugs in.

Then install your ground wire, that's the white wire with aring terminal. Install that on a clean, unpainted metal surface using the included self-tapping screw. Then you do the same thing over on the passenger side. If you need to take up any slack in the passenger side wiring, there are included cable ties.So go over to the passenger side, disconnect your wiring harness and then plug these two white plugs in. The converter in the center prevents overload to your vehicle's wiring system when you are using lights in thetrailer. Clearlyprinted in the indicators is exactly whichwires power whatfunctions. And you install this converter on a flat surface using the included double-sided sticky tape.

This part is made in the United States and it comes with a limited one-year warranty. And there you have it for part number C56131 from Curt. The T-connector harness for your 2011 through 2012 KiaForte. .

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56131

Average Customer Rating:  4.2 out of 5 stars   (6 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.

2003 Pontiac Vibe

As other reviewers have pointed out there is a chance the connector wiring is backwards (mine was). If you see this behavior yours could be wired backwards:

-Left turn -- both tail lights flash
-Right turn -- Nothing
-Hazard -- both tail lights flash
-Brakes -- Nothing
-Running lights -- both tail lights lit

I fixed the wiring problem and now the product works as expected. I would have rated this 4 to 5 stars had the wiring been correct.


Great customer service from however part quality did not meet my expectations. They had installed the wiring in each of the white connectors backwards (ie red,yellow,brown,white was white,brown,yellow,red). Same with the green side. I had to remove them and switch them around. Maybe they just laid them in their jig upside down. It works fine now and that is what matters.

2012 Kia Forte

Custom made and fit just perfect for my 2012 Kia Forte 5. Took a little while to install due to having to remove some interior trim and re install. Actually took longer than the hitch itself! But it worked as it is supposed to and was not hard to do. Just follow the directions! Thanks again Madison P.

2012 Kia Forte5

Almost mounted perfectly with one exception , plate that evap can mounted to was installed just a tad cockeyed,,, had to cut a bit off but other wise it installed very nicely !

2011 Kia Sorento

Great items for the right price would purchase any items from this web site

2011 Kia Forte5

Cheap, easy to install, works well.


Ask the Experts about this CURT Custom Fit Vehicle Wiring

  • Are Taillight Converter Boxes Waterproof
    The converter use on # C56131 is designed to be water resistant, but it isn't what I'd call waterproof. If it was submerged, water would likely enter the case. I've talked to folks who have gone this route, and they have sealed the converter box seams and wire entry/exit points with silicone caulk, which seems to do the trick. If its possible to mount the box in a spot where it would be somewhat protected from the elements, I'd recommend doing that as well.
    view full answer...
  • Trailer Wiring Harness for 2011 Kia Sorento
    The correct Curt trailer taillight wiring harness will depend on if your Sorento is equipped with the factory tow package. If it doesn't have the tow package, use # C56328, unless it's the SX model, which would use the # C59236. If it does have the tow package, it would use # C56332. The Curt # C56131 you'd looked at is a fit for the Kia Forte, and wouldn't work on your Sorento. I've linked to some installation videos that you might find helpful.
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Lindsey S
Written by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B

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