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Towing a trailer with LED lights can often trigger false bulb-out warnings on your vehicle's dashboard, leading to confusion and frustration. The Trailer Connector Adapter, equipped with a Lamp-Out Sensor Bypass, ensures that these low-power-drawing LEDs don't cause any error messages or hyperflashing. This is especially useful for European vehicles like Audi, Mercedes-Benz, Volkswagen, and Porsche, which often struggle with LED trailer lights. Just plug the adapter into your vehicle's 7-way, RV-style connector, and watch your LED-equipped trailer lights work flawlessly—no more glitches or errors in communication.
Hyperflashing, where your trailer's LED lights blink faster than they should, is a common problem when your vehicle's system can't detect the correct resistance. This adapter comes with built-in load resistors that mimic the power draw of traditional lights so your vehicle reads the trailer lights correctly. Say goodbye to annoying hyperflashing and hello to a smooth towing experience with a simple plug-and-play solution.
Many trailer adapters are brand-specific, but not this one. Whether you have a Land Rover, BMW, or Mercedes-Benz, this adapter serves across a range of European vehicles, ensuring you can tow your trailer with confidence. Its flexibility makes it ideal for tackling the challenges posed by mixed vehicular technology in a world where trailers and vehicles often "speak" different electrical languages.
If you're using a wireless brake controller like the Curt Echo, worry no more about interference or connectivity issues. This adapter works harmoniously with mobile trailer brake controllers, ensuring that your trailer's stop and turn signals are accurately detected and responded to. You can relax knowing that your important towing signals are communicated without interruption.
Towing safety is paramount, and this adapter does not compromise. It offers a rugged design, well-suited for tough terrains and long hauls. You can rely on this product to provide a secure connection throughout your journeys, mitigating risks like the separation of connections on bumpy roads.
For certain vehicles, particularly newer models packed with smart technology, hooking up trailers can cause system confusion. This adapter is adept at tricking vehicle systems into registering a valid connection, thus eliminating erroneous warnings. The integration of electrical loads that mimic a full setup helps systems recognize trailers effectively, ensuring smoother integration with modern vehicle technology.
California residents: click here
Got my light to work from my Audi to my camper. super helpful always the best.
Excellent service and the light receptical adapter worked great on my 2011 ML350. Though I should have paid attention and got one that converted to 4 flat. Added a standard adapter which I already had and had working trailer lights.
When I changed my vehicule for the Expedition 2021, I was getting the error message "trailer left turn lamp fault" when towing my RV. After searching online I found out that there wasn't really a problem with the car or the RV. The source of the problem was that I was using the Ford factory tow package with brake control and that their computer thought there was a faulty bulb when in fact it's just because of the low amperage used by the LED lights.
This problem can happen with different vendors not just FORD.
I was releived that there was an adapter to fix this but it was backorder EVERYWHERE.
etrailer kept me informed for several weeks/months until the part was finaly available. (thank you guys for that by the way)
With this adapter, my problem is no more and I can safely travel with my RV without having my left lights disabled by the car's computer (yeah it did that).
Every RV shop should have that and know about this possible issue.
Buy yours before they go BO again. :)
David 
10/30/2023
Product still working as a charm after a year. Thanks eTrailer.
Mike L.
11/14/2023
I ended up not needing it, but it plugged in and accepted my plug with no issues. My problem ended up being a pinched wire but had the same symptoms as a low volt/lamp out issue. Shipped fast as well. I’ve always had excellent service with E-Trailer.
I bought this adapter for my 2024 GMC Sierra HD Denali Ultimate and 2024 DRV Mobil Suites fifth wheel (41RKDB). This adapter worked fine on the turn signals, brake signal, and side cameras. But it caused my trailer brakes to intermittently disconnect. Towing a 19,000lb trailer with no trailer brakes was dangerous and I was very uncomfortable. Perhaps this unit was defective so I will try a replacement.
Jenny N.
7/2/2024
Hey Jim, I would like to figure this out with you. I have a few questions that I would like to ask. Does your 2024 GMC have a lamp-out sensor? We see it more with vehicles like Audi, Mercedes-Benz, Volkswagen, and Porsches. Which brake controller do you have? I recommend testing the 7 way for the brake function on the vehicle side and then also on the trailer side to make sure that there is not a short in the wiring. Also inspect the trailer wiring to the brakes to make sure there is not any broken or frayed wiring going on. I have a FAQ below that is helpful when testing the brake magnets on the trailer.
Less expensive than alternatives, easy to use and store, works perfect.
This device solved my issue. I have a 2022 Audi Q7. Whenever the Q7s headlamps would turn on, I would get error messages saying “ left trailer bulb is out” and then “right trailer bulb is out.” The trailer lights would not come on under normal night driving, however, indicators and brake lights would work. This device solved the problem. No more error messages and all lights work as intended.
The customer support team was great and went to lengths to make sure I was ordering the part I needed, it arrived timely and works exactly as described. The only reason I did not give 5 stars is that the price was higher when I went through the ordering process than it was advertised for. When I questioned it I was told that price changes are sometimes necessary within a company and once you place the order the price is what they charge at that moment. The increase was small and I needed the part so I purchased it anyway. Just be aware that the price may differ from the advertised price.
Worked perfectly with my Mercedes Motor home
Excellent customer service from the owner himself! Thank you for solving my LED trailer light problem!
Smooth transaction, product was delivered on time and worked as it should. I will do business with this company again.
I was on my way to pick up new RV when I learned I need an adaptor for the trailer lights to work with my pull vehicle. I called Joshua at etrailer and he took care of me quickly and got me the adaptor fast. Outstanding customer service. etrailer earned a new client for like.
great service! easy to find the right part, order and shipping! big fan of etrailer.com!
It solved my issue with my Mercedes not liking my trailers LED lights..
Solid, Well-Made, Does Exactly What It Should.
HyperFlashing is Not Cool!!!
I've been trying to track down a part which solves this problem for a while. I started using an LED-equipped trailer and the hyperflashing & computer warning messages are annoying! I almost settled for 20141, but glad I waited. Also, most retailers aren't receiving this part for another month or more. eTrailer shipped the same day as my order.
NOTE: This works well with Range Rover also.
Not related to the product: This was my first eTrailer order and I was VERY impressed. I spoke with two ladies regarding this part and eTrailer's customer service is TOP NOTCH. I will definitely order again in the future! THANKS!
Art M.
7/18/2013
what year range rover does this work with. I just tried it on my 2008 LR3 and I still have the problem?
This adapter saved our sanity! Our 2019 F350 kept giving us the ‘trailer disconnected’ warning constantly while pulling our fifth wheel. We researched the problem online and realized that our truck wasn’t sensing the led lights due to their low voltage. Took the truck to the dealer who assured me they could fix it however the first time we took it out and I adjusted the trailer brakes I started getting the message again . So tried finding an adapter to bypass the bulb out sensor on the truck. I found this via a google search . Plugged this in, and no issues since!! It is awesome and such a good price! I would recommend this to anyone who is towing a trailer with led lights with a Ford truck.
Bruce C.
10/11/2020
Still couldn’t pull my trailer without it , I just wished it would fit tighter. I have to wrap short bungees around it to keep it tight.
My tow vehicle is a Mercedes 2006 ML500 that had issues connecting with the improved LED lighting on my Airstream trailer. I had a choice of a $800 wiring upgrade or this; I tried this and couldn't be happier. Highly recommend to solve the problem - works well, sits in glove box, has held up to frequent use. Only comment - you have to be more firm when you insert It into the receptor - not a big deal, but a thought if you're having problems connecting. Great product, customer service - this company provides practical and reasonable solutions. I'm a committed customer.
Km2016
7/27/2017
Still working perfectly! Has held up well to multiple use, good product. Very happy.
Great so far -- bought this to connect a Mercedes ML350 suv to a Flagstaff travel trailer. As is mentioned many times in different trailering forums, some European vehicles have an issue with false sensor readings when connected to a trailer with LEDs. I had the same exact issue and this adapter seems to have fixed the problem perfectly. Time will tell as we go on our first big road trip with the travel trailer next week. But for now, looks like a winner.
John
6/14/2020
Adapt or works fine. Using it on a Mercedes ml350. However, we bought it ruse with a Curt Bluetooth brake controller which is a piece of junk so we don’t really use the adaptor any longer at this point.
Appears well made. Snug fit. Does exactly what it is supposed to do. I bought it to work with my Demco LED Light Bar for towed vehicles. My 2017 Mercedes Benz Sprinter based motorhome (Winnebago View) has a trailer lamp out sensor as do many European vehicles. This adapter tricks the Sprinter into thinking everything is OK. I plugged in the Demco LED Light Bar without this adapter and it went crazy, flashing randomly. As soon as I added in the adapter, it worked perfectly.
Got my LED trailer lights work in on my Audi! I had a small issue with the spring hinge, which broke on the first unit. E-trailer was outstanding and promptly sent me a new one with a return authorization for the old one. The new one works perfectly, and I would definitely order from E-trailer again! Excellent customer service, and they promptly addressed my minor issue with the first product.
S. S.
1/27/2015
Still working great! E-trailer just sent me an e-mail to see if I was still happy with the product. Great customer service!
Bought this to use on a 2017 Ford F350 that was having trouble with trailer turn signal fault and trailer disconnected message would also come up on the dash. Finally figured out it was the LED lights on the trailer that were causing trouble with the trailer system on the truck. This adapter works great for that , even though it doesn't list it as working with a Ford. Very good product and very good service!
Rachael H.
7/25/2017
Thanks for the Review Mike. I did reach out to my friends at Tow-Ready and confirmed that this item is not exclusively for the European vehicles, and will work with any vehicle that has a trailer lamp out detection monitoring system. The European models were leading the way with those electrical systems. Also if you happen to need a 7 to 4-way adapter the # C35FR functions the same way. It just provides a 4-way for the trailer connector.
This is just what I needed for my 2011 BMW X5d, which has LED taillights, and my new trailer also with LED lights. All trailer lights work and no warning messages on the X5. Thanks etrailer.
Jim B.
1/18/2017
Continued to work flawlessly all year - including a tow from CA to TX and back again.
I am an amateur Porsche Race Car Driver and have a trailer that I pull my race car on. I pull my race car with a Porsche Cayenne Turbo S. I could never get the lights to work properly and hated to rewire as I use an american truck sometimes. Before installing the adapter, the lights would just blink and had no brake lights or signal lights.. The adapter I bought is a great solution for European cars and/or trucks. I purchased the Trailer Connector Adapter w/ Lamp-Out Sensor Bypass - 7-Way RV to 7-Way RV - Vehicle End and it works perfectly. The blinkers works. The brake lights work. I can't believe such an inexpensive solution solved my problem. Contact e-trailer before you think of rewiring any trailer.
When my 4-pin trailer light plug was plugged into my Jeep Grand Cherokee (GC)'s 4-pin connector, the GC reported (on the dash and via a highly annoying beep every time I hit the brakes!) that the LED trailer lights were out, presumably because LED lights don't draw enough current (don't have enough resistance). When using this adaptor that plugs into the GC's 7-pin connector and adapts to my 4-pin plug, problem solved! (I had plugged into another trailer that had incandescent lights, and I didn't have a problem. So I can use this adaptor when I'm pulling a trailer with LED lights, and not use it when I'm pulling one with incandescent lights...perfect!)
I bought this to try to override the glitch in my 2019 GMC 1500 Denali that would not allow the Furrion RV camera to connect. Some on Forums claimed that this was the fix... It didn’t solve the issue. Thankfully that issue went away when I traded for a 2020 Denali HD 2500. Nothing wrong with the product, it just wasn’t the elusive silver bullet I needed.
George
3/17/2022
Haven’t had a need for the product
Condition: Like New
Notes: May have damaged packaging or minor cosmetic blemishes.
Info for this part was:
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Gwendolyn Y.
3/7/2025
Hey Eric. Your camper is adorable! I bet you have made all kinds of memories with it :)