Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
Customers prefer these similar products
If you've ever been frustrated by those annoying dashboard warnings when connecting your LED-equipped trailer, this adapter is your go-to solution. Designed for vehicles with complex lamp-out sensors, such as those found in German cars like Audi, BMW, and Mercedes-Benz, this adapter ensures seamless compatibility. It plugs into your vehicle’s 7-way connector and adapts it to a 4-way or 5-way flat trailer connector, making sure those pesky error messages are a thing of the past.
Simplify your towing experience with the versatile 7-Way to 4-Way/5-Way Trailer Adapter. Whether you drive a Porsche Cayenne or a BMW X5, this adapter connects effortlessly to your trailer's LED lights. It’s specially built for vehicles with a factory tow package, solving the low power draw issues that typically trigger bulb-out sensors. Just plug it in and you're good to go — no complex wiring required.
Have you ever dealt with hyperflashing or errors when using LED lights on your trailer? This adapter comes with built-in resistors, eliminating these problems by simulating a higher load to satisfy your vehicle's electrical system. Designed especially for trailers equipped with LED lights, it ensures that all your tail, brake, and turn signals function without a hitch.
Driving a sophisticated 2024 Audi Q8 or VW Atlas? This adapter is engineered to meet the advanced electrical needs of such vehicles. It allows their smart systems to recognize LED lights on your trailer, enabling safe and efficient towing. With this adapter, compatibility with your advanced vehicle’s lighting technology comes easy.
For those who switch between newer LED-equipped trailers and older trailers with incandescent bulbs, this adapter makes life easy. It’s perfect for older vehicles, like a 2004 Sprinter, that struggle to recognize newer LED lights. Just plug it in, and enjoy full functionality of your trailer's lights, regardless of the system.
California residents: click here
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..
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.
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
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.
Bill 
7/13/2025
One year on and its still working, still doing the job I need it to do.
This along with the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector (part #30717) solved the lamp-out sensor error for our 2013 Ford Escape while towing a trailer. We are so grateful for the excellent videos that etrailer provides with so many of their products.
Brooke M.
4/2/2025
I am so happy to hear that took care of it! It's also really great knowing our videos actually help our neighbors from time to time :) Thanks, Cathleen!
I was getting different error messages with the new LED lights I installed on my trailer. Sometimes the truck would say "check trailer connection" and other times it would say "trailer light out." This adapter solved it - no more error messages. Works like a charm.
Your adapter made the LED tailgate light strip flawlessly. Thank you for being able to have a solution to this problem.
Doesn’t work with Tesla Model Y and LED lighting, while the Tesla sees the lighting it doesn’t do anything. I’m using the Hollywood LED bike rack flexible light bar on my Hollywood bike rack. The Hollywood LED works great with my wife’s Prius C, I wired the system myself for electrical connections. Unfortunately it doesn’t work with the Tesla Model Y from 2025 (not the Juniper edition).
Fixed most of the problems on my Sprint but the Blind Spot warning is still disabled.
E-trailer's customer service is second to none. Any company that deals with the public should take a look at how
E-Trailer treats their customers This is how a customer should be treated.
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?
This adapter attempts to make an analog vehicle trailer system see LED lights, but disables the entire blind spot system.
My trailer running/tail lights were not working due to the truck’s system not recognizing the LED lights. This was a simple “plug and play” solution that seems to be working great!
Quick delivery, great customer service, and follow up. The product works as advertised.
etrailer.com you never cease to amaze me at how well you do with customer information, fulfilling orders and help after product arrival. Nice people you are!
It fit tight. I expected slack and blinking lights. It worked great and forgot about it the rest of the trip. Impressed.
I like the info on the employees.Tracking is great.OH by the way the trailer adapter works.If I need more for my trailer I will use etrailer
Thanks
Used on a 2012 Mercedes-Benz Sprinter, Factory tow package with a Kuat piston pro x bike rack. Totally makes the brake, turn signals, running lights work on the rack.
Exactly what I needed I have a new 2024 VW atlas and needed the adapter to use for my trailer which had the 4 pin works great fast service
Works as should. Plug and go.
Excellent service as always!
EXACTLY what I needed. My problem was we need the lamp on the lifted license plate on our mobility ramp and that constantly causes the lamp outs on Kia 2024 Telluride to alarm. After applying the plug, no more warnings! Thank goodness! What an obnoxious feature!
C35FR solved the issue with my 2016 F150 not recognizing Hollywood Racks Light Bar.((Etrailer part HLY54RR). The light works as designed with this adapter.
This adapter is perfect for enabling LED trailer lights for use with an older vehicle that uses incandescent lights. In my case, I use a 2004 Sprinter as a tow vehicle, and without this adapter, I had no brake lights, turn signals, or flashers on a Wells Cargo trailer built in 2014. With the adapter, all trailer lights work! Other solutions exist to fix this problem, including external resisters that provide sufficient load to trigger the lights, but this adapter is the perfect simple fix.
Problem solved. 2024 GMC Sierra pickup. Truck would not recognize trailer because of LED lights on trailer. Everything works as new and suppose to . THANKS
Fixed the issue I had with my Mercedes GL550 not switching to towing mode and enabling all the LED trailer lights!
I'm so impressed with the products & services I've received from etrailer.com!
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Gwendolyn Y.
4/28/2025
Thanks for saying that, Lynn! You're just as much of a pro as we are :)