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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 # C55522
Our Price: $36.90
You Save: 40%
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 - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance. 1-800-496-5010 to order CURT custom fit vehicle wiring part number C55522 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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  • Reviews (25)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C55522

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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 - no cutting, splicing or tapping required. Converter 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
    • 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
  • 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: 5 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the interior trim panels in your rear cargo area.

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.

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.

55522 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C55522 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 Review of CURT Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C55522

Hello, everybody. This is Jeff at Today I am gonna take a look at this Curt T-Connector Vehicle Wiring Harness, with the Four-Way Flat Trailer Connector. Now, this is a custom fit part. It is designed to fit the 2000 to 2002 Toyota Echo vehicles and the 2003 to 2008 Toyota Matrix vehicles. Now, on a custom fit part like this, I do like to recommend for you to go to our website and use the Fit Guide.

Put in your year and model vehicle. It will show if this will work for your application. Now, this kit here will provide, a four-way flat trailer connector, the back of your vehicle to power your trailer signal lights. It is compatible with five pole, six pole and seven pole adapters that we do sell separate on our website. And this kit does connect very quickly and easily.

All you have to do is locate your connection points, which will be in the rear cargo area. It does come with a set of instructions that will describe where you find those. And then, basically, what you will do is take these t-connectors. There is two of them. You will plug these in, one on each side.

The t-connector with the yellow wire in it is for the driver's side, the t-connector with the length of green wire is for the passenger side. So once you get those connected, then all you have to do is ground this eyelet of the white wire to a good ground nearby. And your system is all ready to go. Now it does include this black box here. This is a tail-light converter.

And this is to ensure that your vehicle's wiring match that of your trailer. It is a power module. It will connect directly to the battery to avoid overloading your vehicle's electrical system. And this converter is constructing using S.M.T. technology which is surface mount technology. Gives you more consistent, reliable performance. It will maximize your trailer-light yield and intensity, while producing minimal heat. And ensures superior operation in rough road conditions. Also, if you notice, they do include this nice dust cover that you can actually put on to your four-way. Snap it on there and you can leave it on there if you like. And then when you are not plugged into your trailer, what you would do is just put this over the terminals. Just like that, and it will protect those terminals from any damage or from the elements. A few specs on this: the maximum amperage for the stop- and turn-light circuit is three amps per circuit, for the tail- and running-lights is five amps per circuit. And just to quickly go through how to install this, again it comes with a nice set of instructions that will describe it step by step, how to install it. But what you will do is go to the rear of your vehicle, go to your rear cargo area, and you will access your connection points again, which will be listed in here. Find your connection points. Driver side. Plug it in. Passenger side. Plug it in. Have your white wire with your eyelet. If there is a ground nearby you can use, you can use that. If not, they do include a screw so that you could make your own ground. Once that is all attached, your converter box here does have a little weight to it, so they give you a piece of. You do want to attach it so it does not bounce around. They give you a piece of double-face tape that you can use to attach it down and then run your length of wire here out the back towards your trailer. Once you get it all installed they do give you some extra cable ties to take up any slack in any of the wiring here. But that should do it for the review on this Curt T-Connector Vehicle Wiring Harness with the Four-Way Flat Trailer Connector..

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C55522

Average Customer Rating:  4.8 out of 5 stars   (25 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 - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance.


Continues to work as intended after a year. It looks much cleaner and is much more reliable than an universal module. In my case, all connections are kept inside the car when not in use so the 4 pin connector doesn't rot like they often do in the winter here in Canada. the only thing that didn't hold is the double face tape to stick the module somewhere.


Nice quality connectors. Super easy to install. Well designed kit.


My second order from etrailer. Both times
was correct and sent on time.

Toyota Matrix

It was the easiest way to wire for a trailer. No soldering cutting etc. It was perfect. Unplug the car's wiring harness and plug in the T-connector adapting harness. So easy. When I sell the car and get another Matrix I will be able to unplug it and use it again if it fits another year.

I would recommend this to anyone.

The Curt C55522 trailer wiring harness you purchased is a fit for the 2000-2002 Toyota Echo and the 2003-2008 Toyota Matrix, as long as your next vehicle is among those models and of those model years, the wiring harness would work fine on the next vehicle.
-- Etrailer Expert Mike L - 02/28/2018


Plug and play into the existing wiring harness, the only other thing you have to do is sand away the paint and use a screw for the ground wire.

2008 Toyota Matrix

This Wiring Harness was used to replace another brand that had failed, and it only took 15 minutes to install it . It is a very clean and almost invisible Wiring Harness.
Thanks to etrailer for the quick shipping .


Snapped together fine. Works great.

2005 Toyota Matrix

Great and easy. Looked at the sheet enclosed in packing.... Well in a box....another similar instructions inside product packing... Too easy, unsnap the lighting connector on each side, make sure to follow convention for druveraide, plug in harness...plug orig connector into harness....too easy.


2008 Toyota Matrix

Ordered what I needed and shipped on time. Easy installation.


The wiring harness is easy to install, but it has a ground wire that the instructions don't mention at all that you have to connect to whatever ground you can find. I'll probably wind up extending the wire and running it to one of the cargo-latch holding bolts, it seems to be the best ground in the tail-light area that is easy to get to.

2005 Toyota Matrix

Talk about EASY! Curt makes this Plug+Play Hitch literally the easiest thing I've ever done.

Excellent Product!

2005 Toyota Matrix

Everything worked as described, the installation was easy, the instructions were easy to follow as well.

2008 Toyota Matrix

So far so good after one year. Zero complaints. Easy to install. Great product and a great price!! Thank you etrailer!

2006 Toyota Matrix

Super easy, quick installation.

It still works great and I remember how easy and quick it was to install.
John v - 04/22/2014


Harness assembly was “plug & play” couldn’t ask for a better product.


2004 Toyota Matrix

Good quality, worked perfectly on my 2004 Matrix


2007 Toyota Matrix






2006 Toyota Matrix


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

  • Trailer Lights Stay on All the Time when Connected to 2006 Toyota Matrix
    This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. Converter # C55522 does have a separate white ground wire that needs to be attached...
    view full answer...
  • Why Do Some Trailer Wiring Harnesses Have Wire that Runs 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. So the connection has to be made to the vehicle battery otherwise the harness will not work. That said, if you have a 2005 Toyota Matrix like you...
    view full answer...
  • Can Trailer Wiring Touch Heat Shield of Exhaust Near Rear of Vehicle
    Exhaust heat shields that are at the rear of a vehicles exhaust system would not get hot enough to melt wire or be an issue. Your 4-way wiring contacting the heat shield there would not be an issue.
    view full answer...
  • Best Wiring Harness For 2005 Toyota Matrix Towing Yakima Rack and Roll Trailer # Y08107
    Since the Yakima Rack and Roll Trailer, # Y08107, can draw a total of 8.7 amps with every light bulb turned on, the best option would be to install the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, # 119190KIT, on your 2005 Toyota Matrix. This harness powers the trailer's lights directly from the tow vehicle's battery so the draw on your vehicle's taillight circuit is virtually eliminated. The maximum rating for this harness is 4.2 amps per circuit for stop/turn...
    view full answer...
  • Can Ultra-Fab Motorcycle Carrier UF48-979033 Hold Yamaha WR250R Dirt Bike on 2006 Toyota Matrix
    The 295-lb dry weight of your Yamaha WR250R dirt bike is well within the 500-lb maximum capacity of the Ultra-Fab Motorcycle Carrier UF48-979033. However, this 2-inch hitch size is not offered for your 2006 Toyota Matrix; only 1-1/4-inch Class I and Class II hitches are made for your car. The highest-rated hitch for your car is rated at 250-lbs tongue weight (TW) which is downward force on the hitch. Even without the 35-lb weight of the Rage carrier added in you would already be over the...
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Lindsey S
Written by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Installed by:
Jeff D
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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