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Curt 7-way connector to 4-way or 5-way flat connector is designed for use on vehicles with Trailer Lamp-Out sensors when towing a trailer equipped with LED lights.
Features:
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello neighbors. It's Brad here at etrailer. And today we're taking a look at the cut seven to four and five pole adapter. So as the name implies you are able to adapt a factory seven way to a four and five pole. And that's really nice because a lot of vehicles will have the factory seven way on there but maybe not the four pole. So if you look came to hook up to a trailer and realize that they have a four or five pole, you might be out of luck or have to run additional wire to permanently mount it.
Well, that's where this comes into play. So that's gonna allow you to be able to have your seven way, your four pole, as well as your five pole just with plugging into the factory seven lane. Now, sometimes your towing vehicle will not recognize the LED lamps on your trailer. And that's where this is great too as plugging that in is gonna allow this to send that signal to your vehicle making sure that your lights are actually working with your signals. So like our neighbor here they have a trailer with a four pole but they got a new vehicle that has a seven way.
So instead of having to run all new wiring for it you can simply plug this into the factory seven way. You can take your four pole and plug it in or if you have the same vehicle but you're towing a different trailer. This gives you that same ability. So having this is going to allow you to hook up electrically to those trailers. So now let's go ahead and test it.
So first I'm gonna start with my running lights. Next I'm gonna do my left turn signal, my right turn signal. And then finally my brakes. Now this neighbor also toes, a boat trailer. So having the five pole is gonna be really nice for the surge lockout as well as reverse light.
Now, for some of your foreign vehicles or high end vehicles that have LED taillights sometimes they don't have enough power to power the trailer lights. Well, this is gonna help with that. Allowing that to give it enough juice to be able to still retain your lights on the trailer. Something that's really nice about this is the size and that if you normally tow a seven pole you can simply swap this in whenever you're picking up a different trailer and need to hook up or really you can use this to hook up to any trailer. You have that ability and you can keep this in your glove compartment until you need it. And that was a look at the cur seven, two, four and five way adapter..
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
WE have a VW Touareg. We needed this adapter to hook up our trailer that had LED lights. The German cars have different wiring I guess so this adapter worked great to get the lights to work.
Fixed the problem I was having with my GMC Sierra 2500 seven pin not providing power for my external LED license plate connected to a bike rack. Amazing oversight that an auto manufacturer would make such a functional change to the external power plugs without any testing.
This is an essential item for towing my LED equipped trailer with my 2023 Volvo. Without it my car does not recognize the trailer being connected and does not go into towing mode.
Exactly as described which was exactly what I needed. Works perfect on my 2025 Hyundai Santa Fe OEM 7 pin hitch wiring harness and my 4 pin motorcycle trailer with LED lights. Quality part. Would recommend purchasing.
I use this adapter to silence the rear obstruction warning when my older hitch mount Kuat Serpa bike rack is attached to a 2025 Porsche Macan 4S EV trailer hitch. Seems very well made and durable.
Brooke M.
6/19/2025
That's awesome! What kind of biking are you into?
2024 mercedes sprinter error when connecting led trailer lights. This fixed it immediately. Truly plug and play.
Works like a dream! Great product and fast shipping. I'm in Canada and received this much faster than I expected. And the shipping here was quite reasonable.
The adaptor is quite robust and worked (once I sorted out the wiring for the trailer).
I highly recommend etrailer dot com.
You were right,the part you recommended fixed my hitch light problem Thank You
Called them. They were helpful and got my order out quickly.
I just got it today. It dose so the check marker lights error when break pedal is pressed. But long term use i don't know if it gets hot or not. But as of 10 mins trying it out it works
The new trailer plug worked perfectly. No more pop-ups on my dash anymore because I have led lights.soooo happy right now
It worked great! I thought I might have a wiring or fuse problem, as another adapter I tried prior to ordering this one didn’t work at all.
Functions perfectly. Mercedes Sprinter and other German makes have circuits that fail to recognize LED lighting that is common today. The C35FR adapter solves the issue and is plug and play. Buy with confidence from e-trailer. Great customer from the PROS.
Gwendolyn Y.
4/28/2025
Thanks for saying that, Lynn! You're just as much of a pro as we are :)
This works perfect. Stop my lights from my truck from doing weird things and sit in codes.
Easy installation
Just the product I needed to run LED trailer lights from a German car
I recently placed an order with etrailer for 2 items. They were delivered promptly and work well. etrailer’s communication after the order was received and up until the products arrived was excellent. I have placed other orders with this firm with similar results.i highly recommend etrailer for great products, at a fair price, and amazing customer service.
Great value, fast shipping, fixed the trailer issue with my Mercedes
installed low profile LED lights on a '98 vintage Kendon motorcycle trailer. They worked when hooked up to my BMW X5, but would also blink every 2 seconds, and showed "bulb out" faults in the diag display.The Curt resistor 7 to 5 plug solved the problem.
Gwendolyn Y.
6/28/2025
That's awesome to hear, James! What kind of motorcycle are you hauling on your trailer?
Gwendolyn Y.
7/2/2025
Just what I needed to get my LED light bar working on my 2025 Rivian R1S!
I have a 2025 Chevrolet 2500HD and 1998 Chevrolet 2500HD. My led trailer running lights don’t work on the 2025 but they do work on the 1998. The turn and brake work on both trucks just the running light issue. Bought this because it’s supposed to fix the issue but it didn’t do anything. I know the trailer lights work because they work with every other vehicle except the 2025. Everything works on the 2025 so it’s not the truck.
100% fixed my issues with recognizing my LED trailer lights!
Adapter fit tightly and all connectors were a tight fit. Great connection.
I had an issue when I plugged my spare tire carrier with License Plate illumination in to my 2022 LTV built on a 2022 Mercedes Sprinter that would show on my dashboard that I had an issue with my Left, Right, and Brake lights and would get the Fast Blinker when using my directional.
This is because of the low draw of current from the light which causes this signal on the Sprinter computer/ trailer module.
This adapter with built in resistor solved that issue.
Worked as expected. Tested all trailer lights worked well with this connector.
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Bill
7/13/2025
One year on and its still working, still doing the job I need it to do.