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Install a 4-way flat on your Ford Flex 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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Average Customer Rating: 4.6 out of 5 stars (1218 Customer Reviews)
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.
No returns on the difficult splice in trailer wiring kits i inadvertently ordered even though they had a car specific simple factory plug in kit available I wasn't advised about.
Came without instructions, had to look them up and even then they weren't great. Some of the provided wire connectors were too small for the wire provided in the kit. But everything seems to work OK.
I enjoy talking to your sales rep. She was very helpful and had knowledge on the
hitch & wiring that I did not. Pleasant to talk with and seemed like she enjoyed her job.
Victoria H.
2/21/2025
Hi Eckstrom, I see Ashley was so helpful in getting exactly what you needed for your Tucson! She is truly amazing at what she does, I will let know you gave her a great shout out! What are you planning on hauling?
Followed the instructional video etrailer has on YouTube. They didn't work, my trailer lights didn't work. Used a voltage meter and the trailer wasn't the problem. My taillights on my car was operational. Tried different location for the power wire and nothing worked. Decided to get rid of the box and spliced the tow light plug directly to the appropriate wires from my car's headlight and it worked.
Very complete tail light wiring system! Great directions, and easy to install. The only thing they can improve on is adding about a foot to each of the wires to make it a bit easier to get them in the right positions.
Easy find the right part using the online part fit guide. Followed up to make sure it was delivered when it was delayed by the post office.
Installed this on a 2014 BMW X3 and works well in conjunction with my new hitch assembly. Although there was not a specific install video for a 2014, there are videos for a 2010, 2011, and a 2017 BMW X3. After watching those videos I was able to apply it to my install. I installed my components on the inside of the vehicle and will pull the 4-flat cable and plug out to the hitch when needed.
Had to return because car dealer said the Tuscon was not prewired. He was wrong. Therefore had to return this item and order the plug and play unit. An added expense was not appreciated because the his lack of experience.
Followed the instructions and no issues. There is a good video on the e-trailer site.
Lauren. I’m so glad I checked with your company to find a great quality trailer hitch for my 2024 Grand Highlander. Everything I needed, you provided! Most of all it all fit up just right and so easy to install, with the help of the videos. Thanks so much! My wife and I are making a move from North Carolinia to Virginia. We have so much small things that wouldn’t all fit on the Uhaul. Glad you were there and provided fast shipping and reasonable prices on all I purchased from you. Thank you so much! Ted.
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 .
The customer service at etrailer is the best.
Rochelle was very helpful with all my questions.
Delivery was as promised.
etrailer does it right when it seems nobody else cares if they do it right or not
Thanks
Brooke M.
11/27/2024
Rochelle is one of the good ones! I will make sure she sees this. Thanks for sharing your experience!
Sorry took so long popped my hip out of place was able to get into garage and everything arrived perfect I have a friend coming to help install as usual it’s great to buy from a company that has such high standards and great employees and the video instructions thanks again!
Simple and clean installation. YouTube tutorials made videos made it a simple job and took any confusion out of which wire was connected where.
I just need a trailer brake now
Instructions. Confused re 2, 3 or 4 wire. Instructions did not help with this. Phot of dif auto types with letters all over them is for what?
Instruction video points out that the wires are not long enough to mount the module where he says to mount it. Did work though, so after trial and error, all is well. Thanks
Easy to find the right trailer light connector kit, well packaged with easy to follow instructions. There's always unexpected problems when installing new equipment, but I think if I go through the install slowly while referencing instructions I'll be fine. Great online experience!
It was basically a generic kit for my 835R John Deere Gator. It looked like it wouldn't really work so unfortunately I just tossed the package on the shelf. If there was a direct fit plug and play I'd buy it.
Everything needed to install trailer li ghting.
Haven’t installed yet but the package looks good. Also good price and delivery is on time.
Yushan
3/17/2025
Installed. Very easy to install, works great.
Jameson C.
3/17/2025
Electrical connectors break easily. Had a hard time finding electrical diagram for GLK 350.
So, video left out removal of plastic trays behind each wheel well. A small torx is required.
Per video my wiring on left side is correct Red to the Yellow/Black, Yellow to the Blue/Green. Test tool (as seen in video) shows nothing when brake pedal pushed; brake indicators on tester both light up when running lights are on, but the running lights indicator does not light up.
Blinker indicators on tester are correct.
Have done the training cycle 6 times, slowly.
Katrina B.
5/16/2023
You will need to double check and make sure that your ground wire is attached to a clean metal surface. If you are grounded properly, and still have no lights, then you will want to test the converter box itself. If you are receiving power to the box and nothing out of the box, then it is possible that you have a defective box.
Steve B.
5/23/2023
Hi. Turns out the video for the 2013 x3 is correct, for my 2017. Brake and tail lights on separate wires.
I would have given you 5 stars if you offered a first responders discount.
I received the product as expected after talking to someone from customer service. And then I received another of the same product today. Not sure what to do with this.
Thanks Chad
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Condition: Like New
Notes: May have damaged packaging or minor cosmetic blemishes.
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Victoria H.
12/5/2024
Hi Randal, if you're trailer wiring harness hasn't been installed, I'd be happy to help you get it returned as well as get the right harness on its way to you.