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Quickly and easily install a 4-way trailer connector on your Toyota Prius 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:
Specs:
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 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.
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.
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.
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I ordered this on a Thursday and received it by the next Tuesday. I was expecting it to be at least two weeks so I was incredibly surprised. I installed it the same day I got it with the very helpful directions; it probably took me 35 min and I had absolutely no idea what I was doing before looking at the directions. Once I got it hooked up in my 09 Prius I tested it out and it worked flawlessly. I can't recommend this product enough and I'd definitely recommend buying it from etrailer. Great customer service when I called and had some questions about it before buying, very friendly. You don't need to hesitate with this product or seller.
This was quite honestly the easiest and most trouble free installation of trailer lights. Everything necessary was in the package, and the instructions were clear. Everything worked correctly the first time, and for me that is something! Great support if needed as well.
Bought this to install in our 2012 Prius III, along with the Curt hitch. I had it all installed with no problems in about 45 minutes. Works great and the quality of the product is excellent too. Thanks E-trailer!
Really easy to install, perfect fit, recommended to everyone if you don't want the headache buy from Etrailer
Fit perfect my toyota prius 2010, my picture not the best picture it give you and idea.
Jose 
4/23/2025
The best of the best, really working fantastic after maybe 3 year . Nice to do business with nice company and excellent parts.
C56147 did not fit my 2014 Toyota Prius V. Prius female connector (circled in red) does not align with C56147 male connector (green). Anyone else run into this problem?
Victoria H.
2/25/2025
Hi Tobin, the part # C56147 will not work for your 2014 Prius V, but the part # 118610 is a confirmed fit. I'll make sure you receive a return label for the one that won't fit.
The images in the installation pamphlet were from a different car and not the prius, so the connection locations were slightly different, but overall this is a great kit. It was fairly easy to install, only required to use a couple of the included zip ties to route the wires and a 10mm to connect it to the battery. No cutting or splicing of the car's current wiring system.
Matt
8/6/2024
Its been fantastic. Ive gotten a few Uhaul trailers and had no issue with the wiring harness nor the hitch, both purchased from etrailer.com
I think it took me about 90 minutes to install. The harness itself was a snap and took less than 10 minutes to connect and tie down.
Rich
4/29/2025
There have been no issues.
Watched the video that was sent and that made the installation go smoothly and quickly. Used tester that I also ordered and tested before putting the panels back in. Super easy, straightforward and only a couple of tools needed -- no wire splicing. Really glad I got the tester, because when I hooked up trailer, that has been sitting awhile, no lights worked. So, a little more work to do on the trailer end, but I know wiring is good from car. Thanks Etrailer.com -- 5 stars!
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
David D.
12/30/2014
To quote my girlfriend, Its been great. I hope you are going to have one for the Tesla Im going to get.
The instructions were great, the product totally satisfactory, and I installed my trailor lighting harness on my gen 2 Prius without a hitch (pun intended)!
Everything works perfect..wiring harness and hitch receiver..I am able to tow 13' Whaler with Gen2 Prius.
Super fast shipping & the exact part I needed to do the job! Excellent communication throughout the ordering process.
The Etrailer video exactly covered the complete installation. Instructions on the video were perfect.
Perfect fit, easy installation.
Worked great
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!
Great product and appreciate the instructions that came along.
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
Teresa
Teresa C.
5/4/2016
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
The wiring harness for my 2013 Prius worked perfectly. The install was quick and easy. I appreciate the follow up and videos. I am a very happy customer.
All was good
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.
Jacob
9/18/2017
I hauled a 9ft, 900 lb. pool table 170 miles and got 45 mpg.
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.
Bob J.
3/10/2017
Just as well as ever! I still use it regularly to connect my Prius to a utility trailer.
Another quality product from etrailer. Easy to install.
Albert
4/4/2024
This harness worked like a charm on our 2015 Prius. Easy to install with clearly understandable directions... a rarity these days it seems.
I thought the product was very well made, nicely priced and easy to install. The only negative is the instructions did not take into account a few things such as the silver mount rings and it says to pull back the felt to get to light plugs. This would damage it. Have to pull out a couple areas around this to safely get to the plugs.
Richard D.
12/12/2019
So far still good
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ProductReview
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I sell and install a variety of components for various companies and individuals. I have zero comebacks from this company. Not that I haven't received defective parts but they always make it right. And that is good business.
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John A.
10/21/2013
This was a LOT easier than I anticipated! Instructions are simple, the wiring harness is a real plug-n-play. Took me about 15-20 minutes. I never had a moment where I felt like I was in trouble with the installation. In fact, as I completed each step I found myself saying Thats it? Im really ready for the next step? Great product!