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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 # C56434
Our Price: $63.84
You Save: 43%
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 C56434 or order online at 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 - C56434

  • 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 rear access panel. You will have to remove the floor covering, rear cargo area cover, and scuff panel 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.

56434 CURT T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Compare to Tekonsha 118801

Installation Details C56434 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 - C56434

Average Customer Rating:  4.8 out of 5 stars   (476 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.


This is a review of the packaging of the trailer hitch, electric harness and locking connector. The items were placed in a box and delivered to my driveway with no packaging material to be seen. Huge holes and the powder coating scrapped off. Heavy meatal items have made large holes in both long sides of the box and not sure if it is worth installing to see if bending or wiring harness has been compromised.


Curt makes some really good products, But they need to look closer at this... I changed the install so It's tons easier. Newer Toyota rav4's have the battery in the rear on the passenger side. This is very convenient for running power to the module. But they want you to mount the module on the other side of the vehicle and run power wires over. I mounted everything to the passenger side and then switched the signal wires for the turn signals (green and yellow). This is a much easier install than running additional wires all the way across. (See pics) Install and operation id great!!!

2022 Toyota RAV4

I recently ordered a Class 3 hitch and T-Style wiring harness system from Curt for my Rav4 Adv. The parts arrived at my doorstep on a Wednesday afternoon as promised, and I had completed the DIY install with the help from etrailer’s [online] videos for my car’s make and model that same night. Hardware fits great and appears to have strong welds and a solid protective coating, and the wiring system was completely plug and play as marketed. Recommended to me by a family member, and I would further recommend this product to any stranger.


Worked as advertised. Panels were easy to pull loose and snap back in place. Access behind panels was a little tight but was able to carefully route wires to complete install. Purchased Curt brackets to attach near hitch receiver.


Great trailer wiring kit. Installation was easy following the online video for how to release the cargo area panels to access wiring to install T-connectors and control unit.


Works great do not run it through inside interior panels go underneath the car my rav 4 has a shield where the break lines run needs to be up high enough too be able to crawl on your back to remove it work your way up to engine compartment feed wire up to your battery used wire zip ties to tie wire to your brake line put back together shield has plastic plugs don’t lose them or break them



still holding up great no problems working great once in a will I spry a little bit off lithium great on plug ends both car and trailer so they go together a little easer try to keep ends from moister problems with plugs


Glad I bought the wiring harness after watching a YouTube video can blow fuse box so this was a plug-and-play and work perfect!!!

2019 Toyota RAV4

there was quite a bit of rear interior panel removal and one wire had to be fed all the way to the battery beneath the car. But the instructional video was very good and if you follow that step by step you'll be OK. Works perfectly on my 2019 Rav4.


The products installed easy but the box as others have stated was terrible, half the hitch was hanging out of the box when it arrived and it was missing a lot of paint, also the tail light kit package was in the box with the hitch so it got all smashed up from the lacl of packaging

2020 Toyota RAV4

Great hitch, well made, great design with hidden crossbar. Best product at best price for my 2020 Rav4. Comes loose in a cardboard box so expect minor damage to finish for protruding parts. Touch up with matte black spray paint if needed. If you figure a way to support the hitch receiver during installation that is adjustable, one person can put the receiver on without lowering the muffler, but lowering the muffler makes it easier to get the bolts in. Bolts on driver side can be torqued easily but due to narrow space on passenger side, you will need something like a "Stanley Proto J5124 3/8" Drive Torque Adapter 3/4"" to properly torque.


Ordered the trailer hitch and wiring harness on 7/17/23. Apparently due to high demand of the trailer hitch, delivery was delayed approximately 5 weeks. When the order arrived, the wiring harness was missing (it was listed on the packing list) as the box was opened and taped shut by UPS. Emailed etrailer a few times without a response, then called. The CSR requested I send a few pics of the box showing the torn flap and the box taped up. A replacement wiring harness was sent and received a few days later. I hope to install the harness in the next few days. There are plenty of you tube videos showing installation, so I don't expect any problems.

2023 Toyota RAV4

I always love shopping on It’s easy to search and find the things I want when they have it. Delivery is expeditious and their customer service is amazing! I already received an email with additional instructions and videos for installation above what was delivered with the trailer hitch.


I think it’s great that you’re able to buy the hitch and install it yourself and the wiring. I saved a ton of money.

2023 Toyota RAV4

Works well, straight forward install. They should change the sides though, so the converter box can go with the 12V battery on the passenger side on the hybrids.

Toyota RAV4

This kit came with everything needed to connect the trailer lights. The installation video for the Rav4 is for the hybrid model which has the battery in the back of the vehicle. This makes for an easy installation. My Rav4 is not a hybrid so the battery is in the engine compartment. The main power wire supplied is long enough to reach the battery, but I could not find a good way to get through the firewall. I ended up getting power from the fusebox under the dash. The adhesive pad included with the kit did not stick so I used some adhesive pads that I already had.


Great trailer hitch and wiring. Was easy to install and came with very clear instructions. Way cheaper than having one installed professionally.


Received order and trailer wiring harness was missing

Etrailer Expert

Jenny N.


I checked and I see that we have been able to send out a replacement harness to you. If you have any questions or concerns on it please let me know.

2019 Toyota RAV4

This is the custom fit harness for the 2019 RAV4. Installation in the 2023 model (as described in the video) requires an additional self tapping screw, so pick one up before starting the install (I found myself using more that the provided number of tie wraps as well). Otherwise pretty seamless.


Works great, easy to install other then running the battery wire for power is a pain.



Still working after a year, only thing I did different from instructions was ran the power wire internally under the carpet and through the firewall instead of under the vehicle, takes more time but last so much longer

Etrailer Expert

Mike L.


@Michael Great! I usually recommend folks use wire loom like # 7509-10 if you want to hit the 'easy button' and run the wire under the vehicle. The loom does a great job of protecting the wire against damage and road gack....


Box was broken when it arrived. The hitch easily punched through it. Some of the powder coat scratched out.


After a year and still working great towed my trailer multiple times and havent had one issue with harness.


Wiring connected the the car's wiring without a problem. I did run into a few troubles though. I used this kit on a 2019 Rav4 Hybrid Limited. The wires from the left turn signal to the control box were too short of allow mounting to the the floor. I had to remove a speaker box to run the wire behind it and mount the control box. Since the wires wouldn't reach the floor I mounted the box to the wall behind the speaker, mistake, the box fit too close to the wall to allow room for the controller. I wound up mounting the controller the the lower left portion of the speaker box. After that everything went well.

Would have given 5 stars if wires had been a little longer



still working good


Installed just like on the videos, just watch (some times rewatch) and follow the process. Everything worked on the first hook up and test. I highly recommend this product.

2023 Toyota RAV4 Prime

The pictures in the instructions printed too dark but I didn't need them because of the excellent videos!


I hooked the power to the rear USB power my trailer is all led has a small power load one year and still working

Show More Reviews

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

  • Recommended 4 Pole Flat For 2020 Toyota RAV4 To Tow Utility Trailer
    I recommend the Curt Wiring Harness with 4-Pole Flat Trailer Connector, # C56434. This will easily be the best way to install a 4-way trailer connector to your Toyota RAV4 as the T-One connector plugs directly into existing wiring without need to cut or splice wires. Please note the linked product review and installation video linked below.
    view full answer...
  • Best 4-Flat Trailer Wiring Harness For 2022 Toyota RAV4
    The best 4-flat trailer wiring harness for your 2022 Toyota RAV4 is from Curt: - Curt Wiring Harness with 4-Pole Flat Trailer Connector # C56434 The # C56434 harness is the best because we have found over time that Tekonsha makes the most reliable trailer wiring harnesses in the industry. This harness also has the highest amp ratings, which means it gives your RAV4 the best prevention against any potential shorts.
    view full answer...
  • Recommended Wiring Harness For 2020 Toyota Rav4 LE Hybrid
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56434 will certainly work with the 2020 Toyota RAV4 LE Hybrid model. The Curt is designed for all models of the RAV4 so it will work well for you. The installation is actually easier because the battery of your RAV4 is located in the rear cargo area so you won't need to extend the black power wire for the converter as far. I have attached an installation video for your reference.
    view full answer...
  • Trailer Tow Wring Kit Recommendation For A 2021 Toyota RAV4
    On your 2021 Toyota RAV4, I recommend the Curt Harness with 4-Pole Flat Trailer Connector # C56434. This kit comes with a powered module that connects directly to the battery to ensure your vehicle's electrical system isn't being overloaded. This is a very simple to install kit, that simply plugs directly into your factory wiring harness, so no cutting or splicing is necessary.
    view full answer...
  • Installation of the Curt T-Connector Vehicle Wiring Harness on 2021 Toyota RAV4
    Please note the linked installation video for the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # C56434 on a 2021 Toyota RAV4. The battery is located in the rear cargo area of this vehicle, so no need to run a wire to the front of the vehicle.
    view full answer...
  • Does Power Wire of Curt Trailer Wiring for 2022 Toyota RAV4 Have to Run to Vehicle Battery
    For trailer wiring like the Curt # C56434 you really need to run the power wire up to the vehicle battery positive post. I know it's tempting to find an outlet like you mentioned and it would work on some level you would be eliminating the circuit protection of bypassing the vehicle wiring so we can't recommend it.
    view full answer...
  • Wiring Harness For 2019 Toyota RAV4 To Tow Small Utility Trailer
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56434 will work well to power the lights on your utility trailer towed by the 2019 Toyota RAV4. Both brands will work and really the only difference is the brand. Installing the wiring harness will not void your warranty on the RAV4 because you are protected under the Magnussen-Moss warranty act that states, in part, that if you install an aftermarket part on your car then it will not void the warranty...
    view full answer...
  • How Do I Install the Curt T-Connecter # C56434 On My 2021 Toyota RAV4 Hybrid?
    In order to install the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56434 on your 2021 Toyota RAV4 Hybrid, the first thing you need to do is disconnect the negative terminal from the battery. After this step, you need to remove any carpeting and scuff panel from the trunk. Next, you will need to Locate the push fasteners on the top of the lower sidewall trim. Using a small flathead screwdriver, release the push fastener lock and pull out. Repeat this process...
    view full answer...
    Image 1 for
  • Trailer Wiring Harness Recommendation for 2020 Toyota RAV4 Hybrid
    The trailer wiring harness I recommend for your 2020 Toyota RAV4 Hybrid is the Curt kit part # C56434 because it installs very easily and comes with the most reliable converter box of all the kits that fit your vehicle so it will last a long time and work well!
    view full answer...
  • Recommended Trailer Wiring Harness for 2020 Toyota RAV4
    I'd recommend going with the Curt # C56434, which would install as shown in the video I've linked for you. The Curt harness is rated for more amperage than the Tekonsha model, which I why I recommend it.
    view full answer...
  • Troubleshooting Curt Trailer Wiring for 2021 Toyota RAV4 that Stopped Working
    If none of the light functions work on the Curt trailer wiring connector part # C56434 that you referenced the first thing I would check is the fuse in the red fuse holder since that controls power to all of the functions. Next I would check to make sure all of the connections are seated properly in case somehow they came loose.
    view full answer...
  • How Do I Run the Power Wire from a 4-Way Trailer Wiring Harness on My 2021 Toyota RAV4?
    In order to install the power wire on a custom wiring harness like the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56434 on your 2021 Toyota RAV4, you can route the wire (typically black) under the vehicle, through the frame under the vehicle, or through the inside of the vehicle. If you choose to go under the vehicle, you will simply follow along an existing factory wiring harness or the frame rail toward the front of the vehicle or to where the battery...
    view full answer...
  • Troubleshooting Running Lights Not Working 2024 Toyota RAV4 After Curt Trailer Wiring Harness
    The Curt trailer wiring harness part # C56434 shouldn't have anything to do with the lane tracing assist of your 2024 Toyota RAV4 but I would first try removing the harness to see if the problem persists or not. If so it's not related to the harness and if so it is somehow related. I would recommend in that case trying to install it again as hopefully the problem was a connector just not seated properly. If the problem comes back after the install then it's the harness and it should be returned.
    view full answer...
  • Best Trailer Wiring Harness for 2020 Toyota RAV4 Hybrid
    For your 2020 Toyota RAV4 Hybrid the best trailer wiring harness available is the Curt # C56434 because it features a higher amp capacity than the Tekonsha alternative and also sports a superior converter box that tends to last much longer than those from other manufacturers. This custom harness, which is confirmed to fit your Hybrid model, will simply plug into the factory ports behind the tail lights and receive power by running a hot lead up to the battery. This will provide you with...
    view full answer...
  • How To Run Power Wire For Curt Trailer Wiring Harness On 2020 Toyota RAV4
    Extending the black power wire to the battery of the 2020 Toyota RAV4 from the Curt T-Connector part # C56434 can be done in a couple of ways. You can route the wire through the frame under the vehicle or route the wire through the vehicle itself. The most common way is to route the wire under the frame which is what our installer does in the video I have attached. I have attached a very helpful article that also explains how to route the wire as well.
    view full answer...
    Image 1 for
  • Does Curt Trailer Wiring Harness # C56434 Fit 2019 Toyota Rav4 Hybrid
    Yes, the Curt trailer wiring harness part # C56434 does fit your 2019 Toyota RAV4 Hybrid model. Only difference will be that the battery wire connection is made at the rear of the vehicle since the battery is located there and not in the front of the vehicle. This actually makes it a bit easier!
    view full answer...
  • Does Trailer Wiring Power Wire Have to Run Through Interior of Vehicle
    When running the power wire for a trailer wiring harness you can run it through the interior or underneath the vehicle to get to the battery under the hood. Whichever is easiest would work just fine. I attached a help article on this subject for you to check out as well.
    view full answer...
  • Can the Curt Trailer Wiring Harness Be Installed On a 2019 Toyota RAV4 Hybrid with Battery in Hatch
    The Curt T-Connector Vehicle Wiring Harness part # C56434 is an excellent option for a 2019 Toyota RAV4 and a confirmed fit for Hybrid models. Installation is actually easier on Hybrid models since the battery is located in the hatch and not in the engine bay. I have attached the video I did on a 2020 model which will be the same as the 2019 that shows how to install the Curt T-Connector Vehicle Wiring Harness on a Hybrid model with battery in the hatch.
    view full answer...
  • Trailer Wiring Harness Recommendation for 2022 Toyota RAV4
    The best trailer wiring kit that fits your 2022 Toyota RAV4 is the Curt kit part # C56434 which installs easily and has the most reliable converter box which means a lower likelihood of it shorting out and needing to be replaced. I attached an install video for this on a similar RAV4 for you to check out as well.
    view full answer...
  • Installing Curt Wiring Harness on 2019 Toyota RAV4 Hybrid
    The power wire for the Curt Wiring Harness # C56434 will just need to be run to the starter battery on your 2019 Toyota RAV4, which is located at the rear of the vehicle. This will actually make the install process a bit easier than with standard vehicles where the wire needs to be run all the way to the battery under the hood. There aren't any specific instructions on how to route the wire but you will just want to make sure you avoid any sharp edges or areas that can become hot during...
    view full answer...
  • Recommended 4 Pole Flat For 2020 Toyota RAV4 To Tow Trailer
    I recommend the Curt Wiring Harness with 4-Pole Flat Trailer Connector part # C56434 which is designed to plug in the rear cargo area of the 2020 Toyota RAV4. The Curt brand is known to last a bit longer than the other options especially the converter boxes. Since you plan on doing some towing you may consider the etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8...
    view full answer...
  • Does Curt Wiring Kit Fit a 2019 Toyota RAV4 Hybrid
    We actually have multiple reviews for the Curt # C56434 that state the customer installed it on a 2019 Toyota RAV4 Hybrid. The one review you are referring to looks like the customer was looking in the wrong spot which is why the connector they found didn't match up.
    view full answer...
  • Tekonsha Trailer Wiring Harness that Fits 2023 Toyota RAV4 Adventure
    Yes, the Tekonsha trailer wiring harness part # C56434 is a confirmed fit for your 2023 Toyota RAV4 Adventure.
    view full answer...
  • Does 12 Volt Power Wire of 2020 Rav4 Trailer Wiring Have to Run to Vehicle Battery
    I understand it's tempting to run the power wire of the # C56434 to a 12 volt source that's easier to get to but you do need to run it to the positive terminal of the battery to ensure the kit's circuit protection is in effect. Otherwise a short in the trailer wiring might cause damage to the vehicle wiring.
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video by:
Joshua S
Employee Jonathan Y
Video by:
Jonathan Y
Employee Aidan B
Video by:
Aidan B
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee John A
Test Fit:
John A
Employee Kristina F
Written by:
Kristina F

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