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Install a 4-way flat on your vehicle with this splice-in harness. Powered converter connects directly to battery to reduce strain on wiring. Potted, SMT construction boosts water and vibration resistance. Works with 2-wire, 3-wire, and PWM systems.
Features:
Specs:
Installation
To determine where to splice into your vehicle's tail light wiring, you will need to consult the included instructions. Use the quick-splice connectors to attach the input wires of the tail light converter to the corresponding wires from your vehicle. Once you've spliced in the converter, connect the included hot lead to the black wire and run it 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.
Then locate a flat surface inside your vehicle near the tail lights and adhere the black converter box using the provided double-sided tape. Find a raw metal surface to use as a ground point and secure the white ground wire using the provided ring terminal and screw. Finally, secure the converter wires to your vehicle using the included cable ties.
It is recommended that you use a small amount of grease on the 4-pole connector to help prevent corrosion.
Because most trailers run on a 2-wire system - wherein the brake and turn signals are carried on 1 wire - the signals from your vehicle may have to be converted to be compatible with your trailer's wiring. If your vehicle operates on a 3-wire system, which means that it has separate brake and turn signals, then those signals will need to be combined so that they run on 1 wire to properly activate your trailer's tail lights. This converter will also ensure that your trailer's lights illuminate fully, even if your vehicle has pulse-width modulation (PWM) wiring. Note: This will not affect how the tail lights on your vehicle operate.
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.
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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The installation went well. The slowest part was figuring out the tail light wiring and labeling them. I had to run the black power feed wire to the battery which is under the back seat. I thought that was going to be the most difficult part of the job, but it turned out to be the easiest.I mounted the module on the inside of the left rear quarter panel near the tail light. Made my connections as per the instructions, and finally inserted the fuse. The lights worked correctly. I then reinstalled the trunk lining and mat and everything was hidden. This was a 2002 Pontiac Bonneville .
I think the product itself is nice. I had a difficult time finding a video tutorial for my particular vehicle. I followed the instructions on the closest comparable vehicle I could find and it did not work. I had to do some problem-solving on my own to get the Tail lights and brake lights to work correctly, but I figured it out. Might be helpful to update videos for my particular vehicle. I think somebody that does not have wiring skills would really struggle with this.
Nick S.
11/17/2025
I appreciate that feedback, and I am glad you were able to get it working. What did you end up having to do to make it work?
This was delivered within same box as a trailer hitch that I ordered for my 2017 QX50. Wir8ng package was open/damaged, however item looked clean and new. I installed it a couple days ago following instructions video since it was not a plug&play application. The installation took about 30 minutes. The unit works flawlessly. I towed my small trailer using the wiring and I had no issue what so ever. Iam happy with the purchase.
Brooke M.
4/23/2025
That's great to hear, Burak! I'm impressed with your install time. Do you work with cars a lot?
Clear directions once you figure out what your car wiring type is
It has worked flawlessly for the last year
Stephen B.
12/12/2025
It has worked great and we use the connector to power the lights on our E bike carrier. I did take the time to solder and use marine shrink tubes on connectors. “Take your time and do the job right or face doing it over later”
It was an open box and I won't be able to use it because it requires splicing into my vehicle harness. I want to purchase a four-pole flat trailer harness that is plug and Play.
Mike L.
12/10/2025
I'll get that return set up for you. Assuming your vehicle is a 2025 Hyundai Santa Cruz, I'd recommend the # C93DQ harness. It's a plug and play install, but you will need to attach one wire to the positive battery terminal.
Works precisely as desired once connected. It doesn't cause a reaction in our new Lexus, which was a major concern to me especially around modern vehicles and their sensitive persnickety electronic overlord modules.
I would like to see one improvement: a tutorial on the Etrailer website for our model Lexus, 450NX h+ at least listing which color wires to tap and where they are located. I worked it out, and that info would have saved a lot of challenge.
The product itself, has been flawless.
Excellent quality!!
Arrived right on time as promised!!
It was excellent customer service from when it was ordered to when it was shipped. My order was shipped out within 2 hrs. after I placed it!!
I was so impressed with the way the process was and how each employee's name is listed who had a hand in the whole order!!
Keep up the great work because the way your company does business, is the way all businesses should be ran.
I will definitly be recommending your company to all of my family and friends!!
Thank you!!
Mike L.
12/10/2025
Aww shucks, Michael! (good name, BTW!) I'm glad we could help!!
Everything went well once I identified the wires, the reason the connectors are different on the 26 kia sportage ex is because the 25 sportage has a 3-wire system and the 26 sportage ex is a 2-wire system. Everything is working well and I am very satisfied.
Hi: the light converter was straightforward to install. The connections were good and the video excellent. We've used a few times. Wonderful to have the utility of pulling a trailer when you need it!
Very happy with the parts for my trailer breaks. Works great! Was very easy to order. The rep was very knowledgeable to what I needed. Even suggested a few parts that I didn't know I needed.
Good instructions and video. I struggle to figure out which wires to tap into, but found my answers on the VW wiring diagram. Works well for me, I put the wire in with the spare tire and then let it hang out the tailgate when I use it hauling a trailer.
This was a real disappointment and I returned this wiring package. I understand the economics of stocking products, but having this as the recommended wiring solution really eroded my trust in etrailer.com. My vehicle--2020 Palisade--has a plug ready to go for a trailer wiring harness. Since I had grown to trust etrailer, I bought the wiring solution they recommended. It would have been a huge hassle to install that recommended solution. That motivated me to look for other vendors' offerings. I found a harness that simply plugged into my vehicles provided plug, had a converter, and provided the four-flat output plug that I wanted, for half the price. I guess I'll have to look twice before simply taking etrailer's recommendation from now on. I still gave them two stars because their return process was very easy and straightforward. I'm just out the shipping cost they deduct from the return. My bad.
The light kit seems to be excellent but I am going to return it because it is over kill and complicated for the install on my wife's xc70 Volvo. It is more for towing a camper or heavy duty trailer with trailer brakes and charging.
This works well - the wiring easy if you know which wires to use and where they are located. On an 2020 Audi Q7 - do not use the wiring harness that goes to the back bumper. These lights are programmed to turn off when the hatch is closed. Instead - locate the harness going to the lights on the hatch. The 2020 Audi Q7 is a 2 wire system. The White wire with the Gray stripe (White/Gray) are the running lights. The Dark Blue wire with the Black stripe (Blue/Black) is the Left turn signal. The Back wire with the Dark Blue stripe (Black/Blue) is the right Turn signal. Use a fuse tap (also on amazon) to tap power for the converter. No need to run a wire to the battery. The fuse box is in the left side area of luggage compartment, right where you need it and you can mount the converter in that area as well.
Does not come with the standard easy connect like other kits shown by curt wiring harnesses. Buyer beware.
Gwendolyn Y.
7/30/2025
Hey John, this kit is a universal option, so it will need to be spliced in. That said, we do offer custom-fit harnesses as well, just let me know the year, make, and model of your vehicle, and I’ll be happy to find the right one for you!
The overall product was fine for the most part. Except for the connector that goes to my vehicle, didn't have one. I had to splice it into the car wiring. I wasn't expecting this
If I had to do it again I definitely would order the plug together model for more $ than to splice this into the wiring on my new car. I put a liberal amount of dielectric grease and tape to cover splices and I haven’t had any trouble, works fine so far.
Can’t go 5 stars as I haven’t hooked up a trailer yet but it checks out with a test light. Install on a MB GLS 450 was not fun but get er done.
Awesome installation instructions, this made the job much less frustrating and I didn't actually pull my hair out LOL. The service staff and advice folks are the greatest in the world thank you so much!
Everything is included in the package to make it a universal fit. Routing of the black power wire was the hardest part for me, because my vehicle sets lower than a truck or SUV. After careful consideration, I figured out the best route to take in running it safely. Instructions were very helpful in the installation of this product. Highly recommend it if you want a very dependable setup.
Installation was straight forward. I'd give this item a 5 star if it came with plug and play connectors instead of using wire taps.
Install video didn’t used connectors provided in kit. Either align video with connectors provided or update the video. Also, install video said I needed to use a rubber grommet to run wire from underside into trunk. No video of where grommet was located. Install was much more involved than video indicated. Also, the written instructions are trash! Converter does work as described after a fairly involved/intense install. If you are not comfortable fishing wires (with fish tape) through tight, blind spaces, and have the correct tools and materials to weather proof connections, have a shop do the work.
This was the only harness that fit my Mitsubishi RVR 2024 it was straight forward and easy for anyone with a basic knowledge of car wiring to install. I installed this in my gerage. It works great and all connections were included.
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Philip
10/10/2025
The product is performing as expected. No trouble at all. I would certainly recommend this product to anyone.