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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 # C56106
Our Price: $88.66
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. 1-636-306-4830 to order CURT custom fit vehicle wiring part number C56106 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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  • Reviews (193)
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CURT Custom Fit Vehicle Wiring - C56106

  • 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.


Features:

  • 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 behind tail lights
    • 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


Specs:

  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 6 amps per circuit
  • Limited 1-year warranty


Installation

This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies 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.



56106 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56106 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 - C56106

Average Customer Rating:  4.7 out of 5 stars   (193 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.

by:
2013 Toyota Sienna

I'm very pleased with this wiring harness. I just used it all week last week with a hitch mounted cargo carrier and did not detect any issues. The install was pretty easy. I have the 8-pasenger sienna and the install worked exactly as shown in the e-trailer video. The only place where I made any changes is I actually routed the power wire to the battery through the interior of the vehicle. The large grommet in the firewall where most of the wiring passes into the interior has a small (separate) opening at on the bottom side. This opening was a perfect size for the black power wire in this kit. Many of the trim pieces along the bottom of the driver interior were easy to remove to feed the wire through and those that were not were easy to slide the wire under to hide it. I highly recommend routing the power wire through the interior. If you search youtube there is a great video of installing this harness on a 2020 sienna and he shows how to route the wire through the interior. I've attached a couple pictures of the wire passing through the grommet. They aren't great but hopefully somewhat helpful.


Comments
After using the wiring harness for a year its still working out well for me. I just used it last week with a cargo carrier and the lights were still working well. Ive used it about 4 times this year and when its not in use it tucks nicely into the 8th seat compartment so its not really in the way during normal use.
Daniel - 07/28/2021


by:
2015 Toyota Sienna

This is the 3rd hitch I've bought from this company. The company is amazing and the customer service is on point and caring. The shipping company damaged the box and parts were missing. Within a day someone had contacted me and arranged shipment of missing parts.
Highly recommend the company.




by:

The instructions were easy to follow. The most difficult part is installing the wire from the harness to the car battery.




by:

One year later I'm extremely pleased with this purchase. I often chuckle when I see stock hitches and the whole thing is visible while mine is neatly tucked under with everything hidden except for the 2" receiver. 10/10 have recommended etrailer on many occasions to friends and family for their service and know-how. Since installing my hitch I towed a pop up camper 1500+kms and do frequent trips to the dump or my local dirt and gravel yard for supplies. Love it!




by:

This wiring harness worked after I wired it in but very shortly quit working.




by:

It's not often that a company provides succinct, detailed how-to installation videos for one's exact vehicle-for free. And then provides the part needed at a great price.
I really appreciate that this lighting kit had plug-and-play tail light connectors-it saved so much time and knuckle scraps!
Don't go to Uhaul for a lighting kit-do it yourself! My first lighting kit done by [other sources] 6 years ago shorted something and required a visit to the dealer to correct. It was a huge inconvenience.




by:
2014 Toyota Sienna

I ordered the Curt trailer wiring harness for my 2014 Toyota Sienna after watching several online videos for different products. I was impressed by the quality and thoroughness of the etrailer product and instructions. Ordering was easy and the package arrived quickly. Installation pretty much went exactly as the video described. I kept the instruction video open on my computer and watched it segment by segment as I progressed to be sure I wasn't forgetting anything. I'm always a little nervous about breakage when removing interior panels, but because of the clear instructions there weren't any problems. (I used a large flat pry-bar for a panel tool) I expected the most difficult and time consuming part to be running the wire under the car to the battery, and it was. But mostly because my floor jack stopped working and I had to use the vehicles scissor jack. But it was pretty easy to find a safe route forward for the wire. All in all it took me about half a day to do the job, and when I was finished and I tested the lights, everything worked perfectly! My first impressions of this product when shopping on line was that it would be of good quality, and I feel the same way after installing and working with it. It's solidly made and the plug and play connectors are really easy to install and a good solution for a solid hook up. Now if only my trailers lights worked that well!




by:

Instructions were easy to follow and job wasn't too difficult. I would rate the job as easy to intermediate. If you have turned a wrench before I don't think you would have much of an issue.




by:

Installation was easy and it works perfectly. I routed the power wire inside rather than under the vehicle in order to protect it. The power cable could have been 24 inches longer to make life easier but it all worked out well.




by:
2013 Toyota Sienna

Well, I got it done. :D I reckon that's good. The video guide was great. The wire for the power to the back was long enough, I cut off a whole 3" which felt a little close.




by:

All around great product. Easy instructions, easy installation. Good value.




by:
2013 Toyota Sienna

Note that the harness for a 2013 Sienna is different than shown in the 2012 Sienna video. I am not sure why, but everything is reversed.

I would consider the trim removal tool to be mandatory on a DIY - will definitely help protect the trim. Also, a long flat bladed screwdriver will be handy for separating the lower driver-side trim, from the upper. There is a tab that needs to be released.

The paper instructions that came with the unit were pretty poor - especially in contrast to the high quality video of the 2012 Sienna.


Comments
The video we have is for the Tow Ready harness designed for the Sienna. Though the harnesses install very similarly, the converter box mounts in difference locations. With the Curt harness the box mounts behind the driver side tail light. The Tow Ready kit, part # 118498
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
$67.41
, mounts the box inside the passenger side jack storage compartment in the cargo area.
-- Etrailer Expert Patrick B - 03/27/2014


by:
2014 Toyota Sienna

I finally got around to installing this wiring kit. As others have said, installing the power wire from the battery to the back of the van was the hardest part. I went down the passenger side, there was a wiring harness with rubber grommet behind the glove box that I was able to sneak the wire through. There was just more crap I'd have to wade through on the drivers side at the firewall. Then I popped the plastic rocker panel covers off and laid the new wire next to existing ones. An electrician's snake was VERY helpful to snake it over the rear wheel area and I added about 6 feet of wire to get to the driver's side, behind the trim panels (they pop off also). I hung the control box behind the trim panel, there is plenty of room for it. The new trailer plug wire comes out cleanly in the little gap between the seats folded down and the back of the van, everything else is hidden. The way that you unplug the light and insert these plugs into the existing wiring is a beautiful thing. I installed the unit and it all worked. I recently bought this van used, it's our second Sienna. This one came with a trailer hitch but we think it was only used for a bike rack - there was no evidence of wiring for a trailer so that's why I had to go this route. I just ordered "air bags" for the rear springs, I know from experience that they help with towing a lot.




by:

Worked as expected. Ran power wire through electrical bushing in fire wall, then under door thresholds with other vehicle wiring.




by:

I haven't installed anything yet but the hitch looks tough and exactly what i wanted, the wiring looks like its going to be an easy install. everything arrived faster then i needed it to. thank you




by:
2020 Toyota Sienna

The hitch was easy to figure out but the wiring harness was a little more difficult, the car manufactures keep changing the wiring. My 2020 was a little different from previous models. Plus I missed the small green icon indicating correct product matching of wiring harness. The service department rating is a 5+ for helping me to get the right part selected, the person who helped me was fantastic.




by:
2014 Toyota Sienna

There is only one thing about this kit that I DON'T love and that is the way that power to run the system is acquired. The easy installation is by unplugging wires from the tail lights and plugging them into a T connector. The T is then plugged back into the tail lights and the wiring to the lights is done. Tuck everything behind the trim and it's beautiful.

However, to get power to run the lights the kit requires that you run a "hot lead" to the battery. It suggests you run it under the car where there is exactly zero other wiring. Why? Because it is a bad place for wires, even the heavy and well insulated wire included with the kit. This is the downfall of the kit.

A better way would be instructions for running the wire inside the car instead of outside. I didn't do that, either. In MY case, I stole power from the 12V power outlet in the right rear panel near where I wired into the right turn signal. I changed the trailer kit fuse from the 10A included to a 5A to be sure I wasn't overloading the 12V outlet circuit that was clearly labelled 10A max. It works just fine on my utility trailer and my boat trailer. Each has only one turn/brake and one running light on each side and 5A is just enough even with incandescent fixtures. If I had more lights, I'd switch them to LEDs to keep the current requirements under 5A.


Comments
It is strongly recommend to run the 12 volt power wire directly to the vehicle battery. The 12 volt accessory circuit was not designed to support the additional load of a trailer wiring harness. A wiring harness must have its own dedicated circuit directly to the battery. We have seen many instances where customers have tapped into a 12 volt accessory circuit, like a car lighter socket, and the harness failed. We have also seen instances where the accessory circuit on the car failed in addition to the trailer wiring harness. Also, this will typically void warranties both with the wiring harness and on the vehicle. For more help with routing the wire, see this helpful article found at: https:/www.etrailer.com/faq-Routing-a-Power-Wire.aspx
-- Etrailer Expert Rachael H - 09/25/2017
One year out and Im totally satisfied. Everything just WORKS every time.
JED - 09/21/2018


by:

I’ve been using this wiring harness for a year now. It was easy to install following the detailed instructions sheet. It has worked great without any problems. If you need a wiring harness this is the right place to get one.


Comments
Its been a year and still going strong. This item is built to last.
Mike - 03/12/2021


by:

Not only works perfectly, but included the wiring needed. As the newer cars do not have a fat wire supplying 10 amps or so to the rear of the car, per the instructions, I just added one.




by:

Works great!




by:

Product is working well. Honestly, I have never seen such a user friendly site and phenomenal customer service...seriously




by:

I did not install the wiring harness, however I was not advised by the installer of having any issues or complaints installing the harness and to my knowledge the harness is working fine because the trailer is now being pulled.


Comments
The wiring harness continues to be very dependable, a quality product.
Jimmy - 11/16/2018


by:
2013 Toyota Sienna

Printed instructions with the harness are fair at best, video on the etrailer site is invaluable, although the product for my model Sienna 2013 installs on the opposite side from the video, so transformer is a bit tougher to place. Have purchased several items from etrailer, always great customer service!


Comments
All is working great, will certainly shop again when looking for trailer related items, and will enthusiastically recommend etrailer to anyone needing the same.
Len - 06/09/2014


by:

Easy to install worked great!


Comments
Lights work great, and holding up to Iowa winters.
Nathan - 03/08/2022


by:

Easy to install. I followed driver side interior wire feed along carpet and trim panels. I did need to add about 6 feet of lead power wire from battery



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Show More Reviews

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

  • How to Determine the Towing Capacity of a Vehicle
    Basically you will look in the vehicle owners manual for the towing capacities of that vehicle. Also there should be listed a gross combined weight rating. This is the maximum that the vehicle and trailer can weigh together and includes cargo, passengers, fuel and anything else in the vehicle and trailer. Stay within the towing capacity and stay within the gross combined weight rating and you will be fine. If you do not know how much the trailer weighs you can take it, loaded and ready...
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  • Does Power Wire for Trailer Wiring Harness Have to Run to Vehicle Battery 2013 Toyota Sienna
    We do not recommend using the 12 volt power outlet in the trunk area for connection of a powered circuit protected wiring harness, like the Curt Powered Converter, item # C56106. The purpose of the power wire is to eliminate the power draw on the vehicles electrical system and sensitive circuitry. Providing power directly from the vehicle battery is the only way to eliminate the draw on the vehicle electrical system. If you use the 12 volt power outlet in the trunk area, the harness would...
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  • What is the Correct Trailer Wiring for a 2011 Toyota Sienna with Towing Prep Package
    All of the available trailer wiring harness available for a 2011 Toyota Sienna, including the CURT wiring, # C56106, install by connecting in line with the tail light wiring connectors located behind each of the vehicle tail lights. A power wire will also need to be run from the converter box of the wiring harness to the positive battery terminal via the in line fuse. No wires will have to be spliced into on the vehicle. The only cutting that will be done is on the power wire of the harness...
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    It does matter where you connect each of the T-connects in the CURT wiring harness, # C56106. The connectors with yellow wires will all be on the left side (driver side). They are for left turn, brake, running lights and ground. Green is the only one that connects on the right side (passenger side). I have included a link to the installation details for the wiring harness for you. I have also included a link to a video of a different wiring harness that installs the same way which should...
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  • 12 Volt Power Wire Must be Connected to Vehicle Battery on 2013 Toyota Sienna
    The battery that is in your 2013 Toyota Sienna gets a constant charge from the alternator. A battery just sitting there might have power but that power is going to slowly fade as it powers the trailer lights. And if you seldom tow, if the battery sits long enough it could go dead. Then you go to tow the trailer and have no power to the trailer lights and you either have to wait while it charges or go buy a new battery. Running the wire to the vehicle battery is not as difficult as you...
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  • Tips for Routing the Power Wiring to Install Trailer Wiring on a 2013 Toyota Sienna
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  • Why Does Trailer Wiring for 2017 Toyota Sienna Require Running Wire to Vehicle Battery
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  • Trailer Running Lights Stay On with Vehicle Off Using Curt T-Connector On a 2013 Toyota Sienna
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  • Troubleshooting Trailer Running Circuit that Works with Only Other Vehicle and Other Trailers
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  • Does Curt Trailer Wiring Harness C56106 Fit 2013 Toyota Sienna XLE
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  • Does the 2012 Toyota Sienna Have a Power Wire Already at the Back to Power Trailer Wiring Converter
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    I don't have an article that specifically addresses that particular vehicle, but the article I'll link you to offers some general strategies and techniques that will make the installation easier for you. There's no 'one correct way' to route the wiring, but the important thing to remember is to stay away from anything that's hot like exhaust components or anything moving like the steering and suspension systems. I've also linked you to installation videos for both the Tow Ready # 118498...
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    The installation of the two trailer wiring harnesses you referenced, TowReady # 118498 and Curt # C56106, will be quite similar on your 2014 Toyota Sienna. Both are powered converters that will draw the required power for your trailer's lights from the vehicle battery rather than through its own wiring. This isolates the vehicle's wiring from faults that could otherwise potentially cause damage to it. It also helps ensure brighter light output on the trailer. The converter box on the Curt...
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  • Are the Connections Opposite for the Curt Wiring Harness, # C56106, on a 2012 and 2013 Sienna
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    view full answer...
  • Troubleshooting No Running Lights with Trailer Wiring Harness Installation on 2013 Toyota Sienna
    I could not find purchase history for you to confirm which wiring harness you have but the linked page will show you those we offer from Curt and Tow Ready, parts # C56106 and # 118498. The most common cause for some lights (in your case stop and turn) to work but not running lights is a bad ground connection either on the vehicle or on the trailer. Since running lights stay on they will draw more current than blinking turn signals or brake lights that are often on for short times. A weak...
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