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Install a 4-way flat on your Lexus GS 300 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 Volvo S40'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 Volvo S40. 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 Volvo S40 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 Volvo S40 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 Volvo S40 may have to be converted to be compatible with your trailer's wiring. If your Volvo S40 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 Volvo S40 has pulse-width modulation (PWM) wiring. Note: This will not affect how the tail lights on your Volvo S40 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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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.
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!
The instructions are basically confusing. Takes more time to try to interpret them than to do the install. We replaced the barrel connectors with Wirefy that have shrink on them for waterproofing and used 12 ga. GXL automotive wire from the battery to the back of the car. This is critical since it is hot to the battery and if abraded can short. Even with a fuse, up to 20 amps of power will short before the fuse blows, enough to cause a fire! The box mounted right on the left taillight assembly. Use spiral wrap to protect the trailer plug wire that passed under the spare tire and out an existing hole in the floor pan. Used an LED to confirm the wires and it all works. Had an issue with the ground, as the existing screw for the taillight assembly was NOT grounded, to my surprise. We sanded the paint around it and that worked. Overall, not a bad setup.
Slashsplat 
7/22/2025
Still works great, one year later.
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!
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.
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.
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.
Overall the product, installation kit and provided videos were excellent. I was able to install the product and have it working successfully in about 90 minutes. The only issue was that I needed 2 ring connectors and the kit only came with one...extra trip to the hardware store. Otherwise, very satisfied and will see how this performs long term.
The Curt Powered Tail Light converter worked awesomely over the past year, definitely worth it! Get a car electrition to instal though to get it right!
Do not attempt to to DYI this converter install unless you are very, very experienced!!
Me, a retired Master Auto/Tech-Electrician took 3-4 hours to do a safe installation. My 2003 Camry's rear wiring is too small to safely carry the amperage that would be needed for a CURT all-plug-in kit.
The long term safe part of the install is fishing routing the black power wire all of the way inside past the C, then B , then A pillars and tie up looping over the steering column and brake pedal assembly. The easy way under-chassis routing along steel brake lines is not long term safe. Dependent then on many many (more than supplied) ny-wraps to keep from hanging down sagging road debris snagged.
It solved the problem of insufficient amperage to light the pop-up. However, the Curt plug and play unit was insufficient in this area for the 2009 Toyota Sienna and a warning should have been made recommending the powered unit only.
Your installation video was great. I don't think I could have found the correct wires without it. The Curt instructions were not clear in determining which wiring scheme the Pacific has. I still don't know what PS stands for in their chart, but your video explained it nicely.
Robert
4/24/2025
After one year the module is working great. No problem what so ever.
The install on my 2013 Buick Enclave was difficult, but not because of the Converter or the instructions but because of the car itself, especially trying to get the 12vdc power wire into the engine compartment. Actually, I ended up drilling a hole into the battery compartment, located behind the passenger seat and saved myself a lot of headache (be sure to make it water tight). The Converter itself works great and the instructions were adequate. The etrailer.com videos helped too! The only issue I had with the converter was that the wires going to the driver-side rear light were too short (IMO) because this caused the converter box to be pulled up into the an area I couldn't get to to secure it. I extended the wires on that side and I was able to mount the converter in a more convenient location.
Works great! Install was fairly easy just following the video. Only issue I had was the 4 pole tester I bought was faulty so check your tester FIRST if something doesn’t appear to be working. After I was all finished I checked and it said nothing on the right side was working. I had followed the directions to the letter so I decided to test the tester on a neighbor’s car that regularly pulls a trailer and sure enough it didn’t work there either. Got a new tester from Amazon the next day and everything looks perfect! (And btw, the tester did NOT come from etrailer!)
Good experience, shipping was quick and arrived on time.
Be aware the instructions are only for the product it doesn’t provide instructions for make and model of your vehicle
The tail light converter will not work on my 2022pacifer because it has no spare tire compartment 2 connect the black part 2
Awesome! Without a doubt, your video made my project possible. Thank you for the time and effort to support regular folk like me upgrade their car without the expense of hiring a professional. I’m so proud of myself and owe a lot of credit to etrailer!
Install was moderately difficult but no one likes to fish wires through anything. Could have used an extra 4-6 inches on the driver side wires that splice into to the taillight.
Only reason why I did not give this a five-star is because the package in could have been better. The corners of the trailer hitch busted through the box along with the 2-in receiver busted through the box and was slightly damaged as far as the paint. I recommendation would be to use a little bit larger box and bubble wrap the sharp ends to avoid breaking through the box and getting damaged. Other than that the installation went well and all parts fit great!!!
Ordering was easy and I found what I wanted quickly. The wiring for the car was linked in the hitch info to.
It was easy to complete the order for both and the came in just a few days.
Ordered wrong kit but correct one is on the way. All good
Brad
9/3/2025
The wiring and the hitch are still super nice No issues at all and I like the way the hitch tics under my Pacifica not an eye sore like some brands. The quality of all your products seems high so will be purchasing and when I need stuff
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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?