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Getting trailer lights set up doesn’t have to mean splicing into factory wiring. This harness uses plug-in connectors that tie directly into the vehicle’s tail light circuits. It clips in place for a secure fit and gives you a 4-flat trailer connector ready for running, turn, and brake lights—no wire tracing or guesswork needed.
The built-in powered converter keeps the vehicle’s delicate lighting circuits safe. It only draws a tiny signal from the tail light wiring and sends full 12-volt battery power to the trailer lights. That means the trailer gets reliable power without overloading or damaging the car’s electrical system.
The included 4-flat plug gives you the standard lighting functions most small trailers, cargo carriers, and hitch racks need. Hook up and get running lights, turn signals, and brake lights all in one simple connection.
When you’re using accessories like a cargo carrier with an optional light kit, this harness provides exactly what’s needed to power those lights safely and correctly. Once installed, it’s a plug-and-play link between the vehicle and your hitch-mounted gear.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
Had it installed by a mechanic. working just fine.
Amazing easy instal used it whole summer. I will see again in a few eeeks if its still working. Its winter here in canada.
Fast shipping , great customer service
Quick prompt delivery, all product looks as advertised. Happy to get started on installation.
I have owned it for 1 year and 10 months. After about 1 year and 6 months the brown wire (tail lights or night running lights) no longer supplies 12 V to the trailer. 12V into the converter = yes (so all of the tail light T connectors are OK). 12V out to the trailer = no. The turn and the stop lights out of the converter work fine. Trailer wiring has 5.8 ohms between the supply and ground pins on the tail light circuit (not shorted, calculated amp draw probably a little over 2 amps). Was hoping for a longer service life than 1.5 times the 1 year warrantee. I gave it 3 stars because technically It met the stated warrantee. Who knows, maybe salt got in my trailer wiring and caused a sporadic short? Documenting it here in case anyone else has a similar issue. I will try a different brand next time.
Frank D.
1/17/2023
Yes, I found a replacement Tekonsha converter. You were out of stock so I ordered it elsewhere sorry. I will be using all the existing Curt T connectors, because the Honda wires are quite delicate I guess they are shaving ounces everywhere on the car for gas mileage and I don’t want to disturb those connections if I don’t have to. I have verified the converter is the culprit. It is out of warrantee and I am not asking for any money. Yes, the Curt double sided tape is feeble. I saw it back in 2021 when I installed it, so of course I used multiple layers of additional HVAC tape to hold my converter in place so there would be no stressed wires going to, or stressed connections in, the converter. I also had the converter located in a nice dry, in the trunk, location. Lesson learned about the Curt converterharness. I won’t buy a harness from them again. I understand you may have chosen to carry the Curt harnesses for economic or customer choice reasons, or you may have been … encouraged… to carry them by Curt. I also realize it is always possible Tekonsha makes the Curt stuff, or Curt makes the Tekonsha stuff, or both are made in the same Chinese factory. Maybe it is my trailer wiring’s fault. According to the literature, the Tekonsha converter appears to have protection in place to protect itself if the trailer wiring is faulty. I feel better about this than the Curt product. I like etrailer a lot. I will buy more stuff from you again, don’t worry. Thanks for your feedback.
Katrina B.
1/17/2023
I am glad that you were able to find a converter to replace the Curt. To be honest, I generally dont recommend the Curt harnesses to our customers because you are not the only one to have complications with the converter boxes. Tekonsha products are made by a company called Horizon Global, and they have nothing to do with Curt products. Curt does make some sturdy hitches and fantastic ball mounts, so we do carry all kinds of Curt products, including their harnesses. If you ever need any assistance on picking a harness or any other towing products, our customer service department and chat teams are more than happy to assist you in finding the best option for your application.
Takes longer to install it you're fussy like me, but the extra time is worth it. It stows nicely in the trunk of the Civic sedan ready for use.
the powered module went out within the fist 6 months of owning this harness
Katrina B.
11/1/2022
I am sorry to hear that this harness did not last. I see that this item has a limited one year warranty. This manufacturer prefers to handle all of their own warranties. You can contact them at 877-287-8634 for assistance.
3 stars because the manual doesn't say which of the 3 connectors go to which plug on the left 2021 Honda Civic tail light. I contacted one of your techs who didn't know the answer. He said he would ask the producer and get back to me. Didn't happen.
Sierra K.
12/2/2021
I called Curt to ask about the vague instructions and a tech said between the 3 connectors, there will only be one that will really fit correctly with the locking tabs on this harness. So, you would disconnect your turn signal connectors on your vehicle and the Curt wiring harness end with the yellow wire between the separated connectors. Essentially, this Curt harness will T into the turn signal connector with those locking tabs.
I don't like the idea of cutting into the wiring on a new car . Corrosion is guaranteed at splice points.I misread the description and thought it was plug and play. Not sure what I'm going to do with it but I don't want to pay shipping for return and shipping for the correct harness
Jenny N.
10/4/2022
You mentioned that you believed that the harness was plug and play. I wanted to advise that as long as you received part # C56396 for your 2019 Honda Civic Sedan then it is a plug and play harness. There is a power wire that will need to be run to the battery from the harness, however it does not splice into the vehicles wiring. I am including a FAQ below that has helpful tips on running the power wire.
Helpful Links
Info for this part was:
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Katrina B.
1/17/2023
Oh wow, I am sorry to hear that this harness did not hold up for you. If the converter box is receiving power and no power is coming out of it, it could be that the converter box is the problem. Now one thing that I know about Curt is that they are better known for their hitches and ball mounts, opposed to their harnesses. I would recommend the Tekonsha harness, part # 118686, in its place. When it comes to Curt harnesses, they use an adhesive, while Tekonsha uses tapping screws to hold down the converter boxes. A lot of times with the adhesive, it will come loose and then the box will be unstable which generally will cause the boxes to stop working. Unfortunately, the warranty is passed due on this harness. However, I would recommend getting in touch with our customer service team for them to get an order for the Tekonsha harness placed for you.