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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. 4 Flat
  4. No Tow Package
  5. Trailer Hitch Wiring
  6. Vehicle End Connector
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2023 Hyundai Santa Cruz
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CURT

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

Part Number: C56371
38 Reviews | 7 Questions
In Stock
$79.91
Retail:$126.95
You Save: 37%
 Custom Fit Vehicle Wiring
Not Confirmed to Fit

2023 Hyundai Santa Cruz

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curt custom fit vehicle wiring end connector 4 flat c56371
curt custom fit vehicle wiring end connector plug-in c56371
curt custom fit vehicle wiring end connector 4 flat
curt custom fit vehicle wiring 4 flat plug-in c56371
curt custom fit vehicle wiring trailer hitch plug-in

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In Use/Installed

2017 toyota prius prime custom fit vehicle wiring curt end connector 4 flat c56371
2017 toyota prius prime custom fit vehicle wiring curt trailer hitch 4 flat t-connector harness with 4-pole connector
2017 toyota prius prime custom fit vehicle wiring curt end connector plug-in c56371
2017 toyota prius prime custom fit vehicle wiring curt trailer hitch plug-in on a
2017 toyota prius prime custom fit vehicle wiring curt end connector 4 flat on a
2017 toyota prius prime custom fit vehicle wiring curt trailer hitch plug-in t-connector harness with 4-pole flat connector
2017 toyota prius prime custom fit vehicle wiring curt 4 flat plug-in c56371

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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 C56371 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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CURT Custom Fit Vehicle Wiring - C56371

Highlights

  • Custom Fit for Your Vehicle: Works with your vehicle's wiring
  • Tow Without Factory Prep: 4-way flat connector powers trailer turn, brake, and tail lights.
  • Plug-and-Play Install: T-connector plugs into tail light ports—no cutting or splicing.
  • Protects Vehicle Wiring: Powered converter draws from battery so OEM circuits stay safe.
  • Reliable Light Output: Provides up to 6 amps on running light circuit for steady signals.
  • Clean, Simple Setup: Includes ground wire and hardware for secure, weather-tight install.

Features to know about

Installs Without Cutting or Splicing: Plug-In T-Connector Harness

Wiring a trailer doesn’t have to mean slicing into factory wires. The Curt T-Connector harness plugs straight into the tail light connectors and gives you a 4-pole flat trailer plug. No splicing or wire tracing needed—just plug it in and it’s ready to use.

Protects Vehicle Circuits: Powered Converter Design

Some vehicles can’t handle the extra current draw from trailer lights. This harness includes a powered converter that draws power directly from the battery through a black lead. That setup keeps your vehicle’s taillight circuits safe while sending clean power to the trailer lights.

Handles Trailer Lighting Load Reliably: 6-Amp Running Light Circuit Output

The Curt converter is built to handle a full load of trailer lights with up to 6 amps available on the running light circuit. Weak or dim lights usually point to a poor ground, not the harness—its output is more than enough for standard trailer lighting.

Straightforward Install with Ground and Power Leads

Everything you need comes in the kit, including the white ground wire and screw for attaching to bare metal, plus the black power wire that connects directly to the positive battery terminal. Follow the instructions, make those two simple connections, and you’re set for solid performance every time you tow.

Standard 4-Flat Connector for Basic Trailer Lighting

Once installed, you’ll have a 4-flat plug ready for brake lights, turn signals, and running lights. It’s the standard connector that fits most small trailers, so you can just hook up and go without needing adapters or extra wiring work.

Specs

  • Comparison image showing Curt T-Connector vehicle wiring harnesses with labeled callouts for different models, illustrating plug styles and connector configurations for trailer wiring.

56371 CURT T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Similar to Tekonsha TK66VR

Installation Details C56371 Installation instructions

This Product Fits The Following Vehicles




Customers Who Purchased This Custom Fit Vehicle Wiring Also Bought...



Customer Satisfaction Score:

Ratings & Reviews

4.7

38 reviews
5 Stars
(34)
4 Stars
(1)
3 Stars
(0)
2 Stars
(0)
1 Star
(3)
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by:
2022 Toyota Prius Prime
Stopped working just as the warranty expired. Now I have to remove the fuse or it keeps a tail light on 24/7
by:
Toyota Prius
This is nice. I saw a hitch someone else had put on their Prius Prime and it looked cheap and thin. This Curt is beefy. The powder coating is thick. Well worth the money. Etrailer's system when you purchase includes the video to install. Very helpful when you order
Mark W. profile picture

Mark W.

6/8/2020

No issues to report. It made it thru a New England winter and is ready to rool for another jetski season. Great product.

by:
Works as it should. Have used it for over a year now.
Installation was fairly easy with video instructions.
Dan profile picture

Dan

12/23/2022

I have been towing more than I should and it hasnt fallen of yet. Thats very good!

by:
I did this installation on 2021 Prius Prime. All parts fit perfectly. The most difficulty was fishing the 12v power wire from the hitch to the battery because I used a floor jack and did not have much space under the car. One tail light plug for one of the jumpers was on the right side of the trunk instead of left. I called tech support and we tested the tail lights with the plug disconnected (the tail lights didn't work- confirmed we had the right plug) then installed the jumper (they worked correctly -so we knew we installed the correct jumper). The converter box and ground connection had to be installed on the right side of the trunk vice left as shown in the video. The videos were extremely helpful.
by:
2017 Toyota Prius Prime
1. Something drew down battery when only driver side was connected but charged battery and proceeded.
2. Video very helpful but might mention that passenger side connectors are not near lights but behind hitch towards the middle of the car.
Once all was done, following the instructions worked fine.
by:
2019 Toyota Prius
This is a quality kit and service from etrailer was outstanding as always. Using this on a Prius Prime it was most comforting to know this wiring kit isolates the trailer from the complicated and expensive electrical system of this vehicle. Draws power specifically from the small 12v cabin battery and independently fused as well. Used their video found on [line] and I installed this myself.
by:
2018 Toyota Prius Prime
I used this for the 2018 Prius Prime and everything worked out just fine. To start, my kit was missing the black silicon that comes with it which was not a game changer but was unfortunate. I also wished they included the heat shrinking butt connector they featured in the video instead of the regular butt connector.
Now that my small complaints are out of the way, the install went smoothly, especially with the perfectly narrated video that walked me through the whole thing. If you don't have a lift, two jack lifts will do just fine, but just be prepared to be under there for a while. Overall, quality product with quality instructions. Thanks etrailer!
by:
2017 Toyota Prius Prime
Easy to install, works as advertised. 10/10 would buy again.
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by:
2014 Toyota Prius
You pay more for this wiring kit, but the cost is insignificant compared
to the possible cost of repairing any car purchased in the last decade if you used a cheaper wiring kit. The wiring kit etrailer sells isolates the power provided to the trailer from the power provided to components in your car. If someone makes a mistake at the interface with the trailer
wiring, the car is isolated from any damage. The cost is right, too, as
etrailer offers it a true $30 discount.

I am 75 and installed the wiring kit myself. three times (2006, 2014, 2018)
in my Prius vehicles. etrailer videos and static photos reassure that you are doing the installation correctly with the least hassle.
by:
Toyota Prius
I've used etrailer twice now. I tried saving a few bucks by buying a hitch/wiring combo on a popular auction site. They sent the wrong parts and I waited too long before trying to install them.

I own a Prius and the seller sent stuff for a Buick.

I will never buy trailer stuff from anywhere but etrailer.

These guys always get it right.
by:
Well made, all parts fit the car. I think the one error in the instructions is that the butt connectors are not heat shrink.
by:
This is my third purchase. And couldn't be happier. the hitch and light package were perfect. the install took less than three hours by myself. Thanks again.
by:
2018 Toyota Prius Prime
the instructions and pictures were very helpful. running the cables and making the connections much easier with your guide. I will tell all my friends to go to etrailer
by:
Excellent produit, expédition très rapide. Merci

Translate [ Excellent product, very fast shipping. THANKS ]
by:
2021 Toyota Prius Prime
Istal it in 2021 toyota prius prime.
First it didn't work but problem I have with the negative wire conection.made a good conection and it start working good . Customer service amazing. Thanks.
by:
Trailer lights work great!
by:
Great customer service & communication. Product arrived quickly & complete as described. Have not had the chance to install it but I'm sure it will work fine.

Thanks,

by:
Easy install thanks so much
by:
You guys worked with me and helped me in every possible way. I am so happy with your product and you have Awesome customer Service team. Thank so much
by:
2021 Toyota Prius Prime
The wrong instructions were enclosed with the wiring harness.
THIS RESULTED IN MY WASTING A LOT OF TIME.
I am working with Curt to get the right instructions.
Jenny N. profile picture
Etrailer Expert

Jenny N.

8/4/2023

Oh my, it is unusual for that to happen. We always have the manual for the harness linked to the product page. I will also have our Customer Service team reach out to you.

by:
Works great. I used it with my trailer and traveled 8000 miles and everything worked amazing
by:
the hookup was supper easy. worked great. thank you.
by:
Fit well. Supplies were accommodating. Works well after install.
by:
Nice item
by:
2019 Toyota Prius Prime
Got the products I needed on a timely basis.
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See what our Experts say about this CURT Custom Fit Vehicle Wiring

Do you have a question about this Custom Fit Vehicle Wiring?
  • Recommended Hitch for a 2019 Toyota Prius Prime
    The correct EcoHitch for your 2019 Prius Prime is the EcoHitch Stealth Trailer Hitch item # 306-X7369. This hitch is custom fit and bolts to your Prius with included hardware. It also has a 2" receiver. The item # EH53VR hitch you were looking at fits the standard Toyota Prius not the prime model. As far as installation goes. If you scroll down the left side of the product page you will see a blue link below the pictures labeled, Locate installers near me. You will want to click on it...
    view full answer...
  • Why Does Power Wire of Curt Trailer Wiring Harness C56371 Have to Run to Vehicle Battery
    Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. That's why you have to run the power wire of the # C56371 to your vehicle battery and not to an aux power source. Hitch extenders cut the capacity...
    view full answer...
  • Trailer Hitch Receiver And Trailer Wiring For 2020 Toyota Prius Prime
    There is a trailer wiring kit confirmed to work with your 2020 Toyota Prius Prime. I am also attaching a link to a hitch receiver for your vehicle if you do not already have one # C11473. The Curt # C56371 is the wiring kit you want for your vehicle. This kit simply plugs into your factory taillight wiring in the trunk and does not required splicing or cutting your factory wiring. You will then have a white wire that needs to be connected to bare metal using the supplied screw, this will...
    view full answer...
  • 2018 Prius Prime Trailer Hitch Recommendation
    For your 2018 Toyota Prius Prime we have the Draw Tite hitch part # 24966 as a confirmed fit. The hitch by itself has a capacity of 2,000 lbs trailer weight. You'd need to check the owners manual of your vehicle and be sure to stay under the capacity listed there for towing too. For trailer wiring you'd then want the part # C56371 which is a confirmed fit. I attached an install video for this for you to check out as well. For a ball mount then you'd need the part # 3592 and hitch ball...
    view full answer...
    Image 1 for
  • Does 12V Power Wire Have to be Connected on Curt T-Connector for 2020 Toyota Prius Prime
    Wiring harnesses that connect to the vehicle battery for power, like the Curt T-Connector # C56371 for your 2020 Toyota Prius Prime, are designed to protect your OEM vehicle wiring so they are built around using the battery to power the lights. On a system like this you essentially won't have any power to your trailer lighting no matter how small the amount of draw. The parts that tee in behind your tail lights are basically like triggers that tell the converter box when to send the power....
    view full answer...
  • Trailer Wiring Harness Recommendation for 2017 Toyota Prius Prime
    Both the part # C56371 is fit for your 2017 Toyota Prius Prime. The Curt kit uses it's converter box to interpret the other taillight functions to know when the brakes are being applied. Basically it's two different ways to accomplish the same thing.
    view full answer...
  • Troubleshooting Weak Running Lights on Trailer with Curt Trailer Wiring for 2019 Toyota Prius Prime
    What you described sounds like a weak ground circuit for the taillights that aren't able to illuminate all the way. The Curt trailer wiring harness # C56371 that you referenced is capable of putting out 6 amps on the running light circuit so it would not be the harness unable to provide the amperage needed. Typically when this issue occurs it's that the taillight assemblies are not grounded properly or the main ground of the trailer's wiring isn't attached to a clean metal surface.
    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 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
Employee Shane H
Test Fit:
Shane H
Employee Jonathan Y
Video by:
Jonathan Y

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