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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

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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 C56147 or order online at Free expert support on all CURT products. Guaranteed Lowest Price 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 (175)
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CURT Custom Fit Vehicle Wiring

  • 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 - no cutting or splicing of wires
    • 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 interior trim panels in your rear cargo area. Once you've plugged in the T-connector, run the hot lead up to your car battery and connect it to the positive terminal. Then insert the included 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.

56147 CURT T-Connector - Surface Mount Technology - 4 Wire

Item # C56147

Installation Details C56147 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56147

Average Customer Rating:  4.9 out of 5 stars   (175 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.


Works well, easy to install, and the installation video was excellent.

Still working great after a year of light use.
Thomas - 05/24/2022


good wiring harness. worked great like everything we have ever purchased from

2010 Toyota Prius

I came across this site by accident and am glad I did. My girlfriend and I do a lot of canoeing and have been dealing with portage problems. This will now allow her to pull a small trailer behind her Prius for the canoe when needed for the 2nd vehicle.
The installation was simple and straightforward enough that with my guidance she was able to do both the hitch and the wiring harness with me as HER assistant.We almost didn't go this route because of other makers' products having to be spliced into the harness.
Thanks again ETRAILER.COM

To quote my girlfriend, Its been great. I hope you are going to have one for the Tesla Im going to get.
David D - 12/30/2014

Toyota Prius

I bought this and did NOT read the instructions. I just watched the video and installed the hitch and the wiring harness within one and a half hours. It was awesome. I was contemplating purchasing a truck because I am remodeling my house, but my brother suggested I get a trailer. I researched and found E Trailer. So simple and I am sooo Happy!!

The prices were awesome in comparison and saved on sales tax. Shipment came in 2 days after ordering!! Awesome...

Prius vs Trailer...

Thank you so much


It has been a year and Im still enjoying this product. When I was at Home Depot the other day getting Sheetrock a lady was asking about is as she had a blue Prius. I gave her product name and number which was conveniently on the hitch! I told her the ease of installing. Thanks again! Teresa
Teresa C - 05/04/2016


Got here quickly. Fair price. Quality construction. Installation was a breeze (it would be hard not to do it right.) Worked the first try. Nice.

Still working perfectly!
Cindy s - 10/18/2021


It was well designed and has worked perfectly ever since I installed it.

The only glitch was the extremely convoluted way Toyota hides the connectors inside the rear hatch. Once I figured out where they were, the installation went very smoothly.

2010 Toyota Prius

Vehicle wiring harness #C56147.
was fast and easy.
Delivery was on time as stated.
Wiring harness was simple to install as noted in the description.

Works perfectly
Richard P - 03/27/2020


The eTrailer harness was well packaged and shipped very quickly. Upon opening the package for inspectionn, I found all the parts to be there, and a very clear and comprehensive set of installation instructions.
Once again, I am glad I dealt with eTrailer.

2013 Toyota Prius

These guys are always prompt and have quality products. They also have a wide range of options: I now have a trailer hitch on my Prius and on my electric leaf. Thanks!


Very happy. Everything plugged right in and works perfectly. Its great not having to cut or splice factory wiring.


I have purchased products from etrailer before and have always received good products in a timely manner.


works like a charm! No issues!


Good kit. Only negative of the kit was that the double sided adhesive tape for the power module was not particularly sticky, an issue remedied with a piece of additional double sided foam tape.


While easy enough to install, there is an issue with the bulbs. Perhaps it is because the trailer (with two kayaks on it) is quite lightweight, but the bulbs go out every time I use the trailer. I’m thinking there may be a better light system for my trailer.


It fit perfectly and was simple to inst all.

2010 Toyota Prius

Complete kit, easy to install in less than an hour on my 2010 Prius. No need for a multimeter no stripping wires and no drilling since I connected the negative wire to the battery and the module mounts with double sided tape. Trailer lights are nice and bright and correct. This is the way to go.

I hauled a 9ft, 900 lb. pool table 170 miles and got 45 mpg.
Jacob - 09/18/2017


No instructions in box, but very simple to install. Second time purchaser, love the product and love the brand Curt.

2005 Toyota Prius

It was very easy to install and use, and tuck out of the way when not needed. I use it many times over the past year on my 05 Prius for towing a utility trailer (have also installed overload springs). I have been very happy with the product and have recommended it to friends.

Just as well as ever! I still use it regularly to connect my Prius to a utility trailer.
Bob J - 03/10/2017

2012 Toyota Prius

Went on without a glitch. Lights work right from the first hook up and every time! Will have to somehow secure the flat wire inside the trunk before it gets caught by the trunk latch - couple of pieces of velcro might do the trick.

Still works like a champ!
Hee-choon - 01/02/2021

2013 Toyota Prius

Installed this on my 2013 Prius to tow my 8 foot trailer. This system included eveything I needed except for smaller hands to get into the tight spaces that Toyota provides.
Other than the ergonomics, which isn't the fault of eTrailer or Curt, this was a plug and play operation with clear and concise instructions.
I normally have the flatpack pigtail under the floormat, resting on top of the spare tire, so when it is not in use, there is no interference.
I give this device 5 stars, and have no problem recommending it to others.
I also give 5 stars to eTrailer for their prices and shipping speed.
You can't go wrong with this T connector harness, and eTrailer.


Easy to install with clear directions

2005 Toyota Prius

I have Thule 990XT hitch rack that I bought from ETrailer mounted on a 2005 Toyota Prius. A unique problem arose with it - the thin rear turn indicator lights are blocked by the rack in its up position, which led to a number of angry drivers honking at me and a couple of near collisions on the highway entering a lane that a driver two lanes over was also entering.

I found that expert Mike L of Etrailer had posted a suggested fix of mounting the Rola LED light kit for cargo carriers on the rack and connecting it to the car with the Curt Wiring Harness. My mounting is a bit kludgy but durable and functional. In fact, the lights hang so that they operate in both the up and down position of the rack.

Thanks to ETrailer for making this safety improvement possible.

2018 Toyota Prius

A co-worker told me of the great experiences he has had with etrailer which prompted me to check them out. My order and delivery process was very seamless. External packaging could have been a little more robust as one end of the hitch (Draw Tite) wore through the box. Thankfully, the loose items were not only bagged, but secured with additional taping to the hitch. The particular hitch I purchased installed in a little over an hour and the wiring harness (Curt - C56147) installed in about 1-1/2 hr.

We are purchasing a light-weight camper, 265 lbs with 18 lb tongue weight, and plan to use our Prius to seek out adventures in the great outdoors.

[Online] videos of installation helped build my confidence to install myself. I would order from again.

Toyota Prius

Cheap and easy, but in cold weather the fuse trips and I had trouble on my Prius.

Toyota Prius

The trailer wiring harness kit fitted well on the Prius. Neat installation. When not in use the trailer wiring is out of site in the rear storage compartment, and deploys easily out of the hatchback. Worked perfectly ever since, coupled to a GO camper (840lb). The installation videos are very good.

Show More Reviews

Ask the Experts about this CURT Custom Fit Vehicle Wiring

  • Does Curt Trailer Wiring Kit part # C56147 Fit a 2012 Toyota Prius
    The Curt trailer wiring kit part # C56147 that you referenced has been confirmed as a fit for your 2012 Toyota Prius. At one point the fit hadn't been carried over to the 2012 models and that is why you found info that said it wasn't a fit but I can assure you it does fit.
    view full answer...
  • Trailer Wiring Harness Recommendation for 2015 Toyota Prius
    Yes, for a trailer wiring harness that fits your 2015 Toyota Prius we have the Curt harness part # C56147 as a confirmed fit.
    view full answer...
  • Troubleshooting Prius Trailer Wiring Harness with Low Voltage
    The 4-way of the part # C56147 should have 12 volts on the pins when the appropriate taillight signal is activated. Yours only having 6 volts could be due to the red wire of the converter not being ran to the vehicle battery or the fuse not being installed in the fuse holder on the wire. You might try testing the harness with the vehicle running as well. I attached a help article on troubleshooting for you to check out as well.
    view full answer...
  • Trailer Wiring Harness for a 2012 Toyota Prius
    I checked with Curt and they list wiring harness # C56147 for a 2012 Toyota Prius. I have included a link to the installation instructions for you. I have linked a video showing an example installation for you.
    view full answer...
  • How Does Trailer Wiring for 2012 Toyota Prius Install
    The trailer wiring kits we offer for your 2012 Toyota Prius like the Curt # C56147 that you referenced actually plug in line with the taillight connectors of the vehicle and do not require a special t-connector for trailer wiring. I attached an install video for this kit on a similar Prius as yours for you to check out as well.
    view full answer...
  • Trailer Wiring Recommendation for 2010 Toyota Prius
    None of the trailer wiring harnesses we offer have the turn signal and brake lights separate as the standard for trailer wiring is for those circuit to be combined. Best option we'd have is to install the part # C56147 like you mentioned and then use a converter box on the trailer you tow to separate out the circuits. For that you'd need the # 118158 which will do this.
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2014 Toyota Prius Two
    The base model of the 2014 Toyota Prius is the Two. The Curt Trailer wiring harness part # C56147 has been confirmed to fit your Two model 2014 Toyota Prius so it would be the correct harness.
    view full answer...
  • Troubleshooting Power Always on Curt 4-Way Harness on a 2005 Toyota Prius
    The first thing I would do is review the installation video that I attached for a similar product as the Curt Harness # C56147 to make sure you have everything installed correctly. Next thing I would do is use a circuit tester like our part # 40376 to test for voltage on the input side of the converter box. When the key is off there should not be voltage on these circuits with the exception of the battery circuit. If there is voltage on these circuits then you know the problem is in your...
    view full answer...
  • Parts Needed to Convert a Combined Tail Light Signal to a Separate Tail Light Signal on a Trailer
    You are going to need to wire in a converter on your trailer in order for the separate tail lights of your trailer to function. I would recommend you install a Taillight Converter # 118158 on the wiring of your trailer. This will convert the combined signal from your vehicle to a separate signal and should allow your trailer to function properly. To wire it in you will need to take the right turn/stop circuit and run it to the green wire of the input side of the converter. Ground the...
    view full answer...
  • Troubleshooting Hybrid Error Code After Trailer Wiring Install of 2010 Toyota Prius
    The video you referenced shows the Tekonsha kit part # 118505 install on a 2010 Toyota Prius like yours which is basically the exact same install as the Curt part # C56147 that you have. If there's a Hybrid Error warning light coming on I would suspect the issue is related to the battery wire of the kit. Make sure it's attached to the positive terminal of the battery securely and no exposed wire on this circuit is making contact to anything metal. It's also possible the battery terminal...
    view full answer...
  • Trailer Wiring Recommendation for a 2012 Toyota Prius V
    I spoke with my contact at Curt and she informed me that for your 2012 Toyota Prius II you will need a Curt Custom Fit Vehicle Wiring # C56496. This is a hard wire install that requires that you test the wires of your tail light circuits that you have found. Check out the installation instructions and install video I attached for you. The Curt Harness # C56147 that you referenced is only for the older model Prii before 2012.
    view full answer...
  • Trailer Wiring Harness Options for a 2010 and Newer Toyota Prius
    The third generation Toyota Prius starting in the 2010 model year can use Curt trailer wiring harness # C56147. You could also use # 118505 both it and the Curt harness plug in line with the vehicle tail lights to get the correct signals. I have included instruction links for both wiring harnesses and a video showing installation for harness # 118505.
    view full answer...
  • Which Trailer Wiring Harness for 2008 Toyota Prius
    If the trailer you'll be pulling has minimum lighting, one stop/turn/taillight on each side at the rear of the trailer, or if the lamps are LEDs then the Tow Ready # 118505 would work just fine for you. The Curt # C56147 has a slightly higher capacity, so if you have more lamps on your trailer other than the minimum amount mentioned above, the Curt harness might be a better choice. I've linked you to an install video for the Tow Ready harness. The procedure for the Curt harness would...
    view full answer...
  • Can a 2008 Toyota Prius be Flat Towed
    To tow your Prius, I recommend using the Roadmaster Tow Dolly, part # RM-2050-1. This dolly comes with tail lights, wheel nets and electric brakes, so you should not need to purchase any additional equipment to tow your vehicle. I do recommend checking your owners manual for any specific towing procedures or restrictions before making any purchases. The trailer wiring harnesses cannot be used in reverse as a tow bar lighting solution. I wish we had a tow bar lighting solution for your...
    view full answer...
  • Will My Class II Hitch Work on my Wifes 2011 Toyota Prius V?
    Thank you very much very much for your question and congratulations on the potential sale of your vehicle. I did research on your question, and the owner's manual for your wife's 2011 Toyota Prius V has a section on trailer towing. It does indicate Toyota does not recommend towing a trailer with your vehicle.Toyota also does not recommend the installation of a tow hitch or the use of a tow hitch carrier for a wheelchair, scooter, bicycle, etc. Your Toyota is not designed for trailer towing...
    view full answer...
  • Can a 2014 Toyota Prius Tow a Small Trailer
    As far as whether or not you can tow a trailer with your 2014 Toyota Prius you will need to check the owners manual or with a Toyota dealer for the final say on that. Our understanding is that Toyota says that you cannot tow at all with your vehicle. With that being said we realize that some people still tow trailers with vehicles that are not recommended for towing and we do offer the parts needed for your vehicle to tow a trailer. The Draw-Tite part # 24847 would be the hitch to use....
    view full answer...
  • Converting 4-Pole Trailer Connector on 2010 Prius to 7-Way
    When you state that your trailer has a 7-pin flat pin plug, are you referring to a 7-way like part # A7WCB? If so, please be aware that a 7-way connector such as that would frequently be found on a larger trailer that has electric brakes that probably shouldn't be towed by a Prius. I don't believe Toyota recommends using the Prius for towing, you'll want to consult your owner's manual. If the trailer is smaller and doesn't have brakes, you can use an adapter like # 37185 to convert the...
    view full answer...
  • Adding a 7-Way Trailer Connector and Brake Controller to a 2011 Toyota Prius
    A 4-Way trailer wiring harness such as # C56147 only provides the lighting functions on a trailer and not electric brakes. If the trailer has hydraulic surge brakes and not electric brakes you would not need to add anything to the vehicle or trailer. But if they are electric brakes then what I recommend is to install 7-Way trailer connectors on the vehicle and trailer and you will need a brake controller installed in the vehicle. The brake controller is what controls the trailer brakes. To...
    view full answer...
  • Recommended Ball Mount for 2014 Toyota Prius with Class I Hitch Receiver
    The Draw-Tite Sportframe Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4" # 24847 is 11-3/4 inches from the ground to the inside top of the receiver. For your 4 inch rise, the Draw-Tite Drawbar for 1-1/4" Hitch - 2-1/8" Rise, 2-3/4" Drop - 6-5/8" Long - 2K # 3593 which is what we typically recommend for this hitch is not going to get you there. The Draw-Tite Drawbar for 1-1/4" Hitches - 4" Rise - 10" Long - 2,000 lbs # 3594 is my recommendation for you because it give you the rise...
    view full answer...
  • Which Hitch Will Fit a 2015 Toyota Prius Four
    I was able to confirm with my contact over at Curt that the Curt # C11276 will fit on the 2015 Prius Four that you've got; it's really just a sub-model of the Prius and he was able to confirm through their internal fit guide that this hitch will fit this vehicle as well. For a ball mount you'll want to use the Curt Class II Drawbar - 2-5/8" Rise, 3-1/4" Drop - 7-1/4" Long - 3,500 lbs # C45521, which requires a hitch ball with a 3/4" diameter like the # 19258 (2" hitch ball) or # 19256 (1-7/8"...
    view full answer...
  • Hitch, Wiring and Ball Mount to Equip 2003 Honda Odyssey and 2015 Toyota Prius for Towing
    We can help you get your two vehicles, the 2003 Honda Odyssey and the 2015 Toyota Prius, ready to tow your Yakima Rack-and-Roll trailer, whether it is the 66-inch model # Y08106 or the 78-inch model # Y08107. Let's start with hitches for the cars. For your 2003 Honda Odyssey both 2-inch and 1-1/4-inch hitches are offered. To keep things simple and compatible with the Prius I suggest the 1-1/4-inch Class II hitch # C12031 which offers no-drill installation; it comes with all required...
    view full answer...
  • Trailer Hitch Recommendations for 2014 Toyota Prius
    You'd first want to equip your Prius for towing by installing a trailer hitch. I'd recommend the Draw-Tite Class I trailer hitch, part # 24847. For a trailer wiring harness, use part # C56147. You'll also need a drawbar, part # 3594 and the appropriately sized trailer ball. For a 1-7/8 inch ball, use # 19256 or for a 2 inch ball, use # 19258. Keep in mind that Toyota didn't recommend using certain Prius model years for towing, so you'll want to consult your owner's manual for clarification. Part...
    view full answer...
  • How to Tow a Trailer with Reverse Lights 2013 Nissan Leaf
    Yes, the Submersible, Over 80" Aero Pro LED Trailer Light Kit part # TLL36RK, Light Guide LED Backup Light part # BUL602CB, 25 ft. Wishbone 5-Way Trailer Harness part # A25W5B, and Right Angle 3-Wire Pigtail for Optronics Trailer Lights part # A47PB will all work together and give your trailer reverse lights. The Submersible Tail Light Kit part # TLL36RK comes with a 4-way wiring harness and since you will be using a 5-way wiring harness, the more cost effective solution would be to purchase...
    view full answer...

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