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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 # C56217
Our Price: $38.36
You Save: 48%
Custom Fit Vehicle Wiring

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Shipping Weight: 0.96 lbs
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. Connectors plug 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 C56217 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 - C56217

  • 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. Connectors plug 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 - no cutting or splicing of wires
    • Tow harness with 4-way connector plugs into connection point in rear cargo area
  • 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
  • 1-Year limited warranty


This custom-fit T-connector plugs into your vehicle's wiring harness. The connection point for the 4-way tow harness is located behind the interior trim panel in your rear cargo area. Once you've plugged in the converter, insert the included 10-amp fuse into the integrated fuse holder.

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.

56217 CURT T-Connector - Surface Mount Technology - 4 Wire

Replaces 56034

Installation Details C56217 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 - C56217

Average Customer Rating:  4.8 out of 5 stars   (973 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. Connectors plug directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance.


The website gave me the perfect fit for our Highlander. Shipping was fast and arrived on time. Installation was a breeze with the hitch and wiring harness. Great overall experience. FYI…I installed this entire system by myself in under an hour.



Works perfect

Etrailer Expert

Mike L.


@Joshua Awesome, we're glad to hear that!

2017 Toyota Highlander

I just received the trailer hitch and the wiring harness about 2 hours ago. So I really can't read it yet. But reviewing the YouTube how to install them I believe I am going to be very very happy


Everything went well during hitch install. However, the wiring harness instructions did not clearly identify exactly where the extra fuse goes. Nor does the included 10 amp fuse match the rating in the fusebox, which states 30 amp. So ... will need to wait and see if it works. Great looking trailer hitch!

2016 Toyota Highlander

I was extremely happy with the etrailer hitch, l had a little problem installing the hitch because l had one bolt hole that did not line up, l did not have a vise to hold the the hitch in place move it a few inches however l did have a come along l was able to loosen two of the bolt attach the hook from the come along and ratchet the hitch bolt hole a few inches until it aligned with the hole on the truck body. I was able to screw in the bolt. The hitch looks great.l highly recommend etrailer for any towing needs


15 mins and harness was in and trim put back in place. Very happy with video from etrailer on install. Super easy plug and play. So simple thanks to you guys. Saved at least $200 doing harness and hitch by myself. Thank etrailer



Holding up very well after being on for a year


etrailer makes installing a breeze with their videos. Installed a hitch and wiring harness on our 2015 Highlander and it couldn't have been easier. Thank you etrailer for making a possible frustrating job simple!

Saturn Relay

This wiring harness kit fit my vehicle perfectly and provides the correct electrical relay voltage to operate my trailer lights. Instructions were easy to follow and all parts were included to finish the installation.


The harness took me one hour to install. That included getting the tools, installing the harness. Confirming it worked properly with a multimeter and putting the tools away.


Horrible. The video is for a Highlander, which is different enough to be useless. Found the 10-pin, disassembled the entire rear, can't find the 4-pin. etrailer supports response was the equivalent of "keep looking." Over two hours now and still can't find the @#$&ing thing.


The harness was easy enough to install, but the instructions included were inaccurate. It states you need to install it under the dash, where the factory trailer lighting is in the trunk. The video installation does it correctly, but the included instructions do not.



Still works great. Real easy to install.

2018 Toyota Highlander

Trailer hitch and wiring kit are working great after a year on our 2018 Toyota Highlander.

2019 Toyota Highlander

I have a 2019 Highlander and the installation went very well. I bought the Drawtite hitch with the mounting bracket for my wiring plug, so I wanted my wires to go under the vehicle and not through the rear door. Once I removed the trays from the back of the vehicle, there was a rubber plug in the corner that could be removed that allowed access under the vehicle. I decided to use my box knife to cut a slit in the rubber plug. I had to cut my wiring harness across the 4 wires to run them through the rubber plug. I crimped them back together as seen in the photo. I used zip ties under the vehicle and inside the back to clean things up.

Etrailer Expert

Mike L.


Nice job on the install! I would make one recommendation.. Id use some silicone to seal the hole in the grommet where the wire passes through to prevent moisture or exhaust gasses from entering the passenger cabin.


Easy install with help of the video! Thank you


Trailer Hitch fit perfect. It took me, by myself 30 min to install. The wiring I got directly from Toyota per my vin number. That took about 20 min to install. I'm very happy with my purchase


Perfect fit. Easy to understand directions. Really easy to install!

Michael D.


After a year, not a care in the world. Love it!


It couldn't have been easier. Simple plug-n-play. Instructions were accurate with location of factory connectors. Product was fail proof. Installation was under 30 minutes.


Clean simple installation. Highly recom mend!

2016 Toyota Highlander

Shipping was prompt. Arrival was without damage. Instructions were clear and easy to follow. Installation time was about an hour as the instructions predicted. The fit was perfect! The qualtiy seems good and the hitch looks good on my vehicle!

Tom D.

9/17/2018 problems!

2019 Toyota Highlander

Could not have been easier connecting for my 2019 Highlander XLE AWD. Worked perfectly and very economical!


Very happy with the ordering and delivery process, the hitch and the price! All in installed cost was under $400 compared to a local garage wanting $895.


The harness was simply plug and play, easy to install.

The customer service I received was fantastic. Stacey and Emily were incredibly helpful and knowledgeable about the product.

I have already convinced one friend to work with Etrailer, and will not hesitate to recommend them every chance I get.


Quality of products was good with the exception that the hitch required a lot of extra muscle, clams and 2x4's to get the holes to sign up. Their is an entire page on retailer that talks to this and creative ways to get the hitches to fit. When the hitch says bolt on, I expect it to be a simple bolt on product. The harness comes with everything except the nut you need to ground the wires :-(. I also recommend before cutting the under body plastic per the insdtructions take a look at how yours fit and make only the minimum cuts needed. My driver side only needed a small section removed to fit perfect and the passenger recorded no modifications and went right back in place.

2008 Toyota Highlander

This wiring harness fit my 2008 Toyota Highlander Sport perfectly! It's very easy to install, especially if you watch the installation tutorial video. It's literally plug and play. Everything you need comes with it, including the fuse and zip ties to hold everything in place. The only hard part for me was getting under the dash and tucking everything away neatly, but that's because I'm a big guy and there's not much room down there. I ran mine to the outside of the vehicle to the hitch and installed it in a mounting bracket instead of leaving the harness inside the car and pulling it out every time I need to use it. There was an extra hole that had a rubber plug in it near the tail light area where the connector for the harness is. I took the rubber plug out and ran the wiring to the hitch. I filled the hole with silicone caulking on the inside and outside to prevent any water from getting in. I also wrapped all of my connections with electrical tape. The four way has a dust cap to protect the pins from dirt and debris when not in use. I installed it on the hitch using the mounting bracket (item 18144) here: . Looks great! I tested my connections and everything works perfectly! Great product, great price, and you save a ton of money on installation by doing it yourself! Thanks,, for the great tutorial and product research!


The wire harness worked great, just what I needed.


Haven’t installed yet but etrailer has never disappointed me over the years. Always deliver quickly. Their products are not junk and are made to last. Great customer service

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