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7-Way to 5-Way/4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs

7-Way to 5-Way/4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs

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Tow Ready 7-way connector to 5-way or 4-way flat connector is designed for use on vehicles with Trailer Lamp-Out sensors when towing a trailer equipped with LED lights. Lowest Prices for the best trailer wiring from Tow Ready. 7-Way to 5-Way/4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs part number TR20141 can be ordered online at or call 1-833-496-1390 for expert service.
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Tow Ready Trailer Wiring

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Tow Ready 7-way connector to 5-way or 4-way flat connector is designed for use on vehicles with Trailer Lamp-Out sensors when towing a trailer equipped with LED lights.


  • 7-Way RV style adapter to 5-pole and 4-pole flat trailer connectors
  • Designed for use on vehicles with Trailer Lamp-Out sensors - such as Audi, Mercedes-Benz, Porshe, and Volkswagen vehicles with the factory tow package
  • Plugs into a 7-way connector on the vehicle and 5-way or 4-way flat connector on the trailer
  • 1-Year limited warranty

20141 Tow Ready 7-Way to 5-Flat and 4-Way Trailer Adapter for VW, Audi, Porshe, and Mercedes-Benz Towing Trailers with LED Lights

Replaces V39008

Item # TR20141

California residents: click here

Video of 7-Way to 5-Way/4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Tow Ready 7-Way to 5-Way/4-Way Trailer Adapter Review

Randy: Hey, guys. It's Randy here at We often get questions from our customers about how they can get their seven pole on their vehicle to work with different types of trailers.What we're looking at here is a four and five-pole adapter, so this is going to allow you to use the standard four-pole plug that you're going to find on most utility trailers. This is going to have your ground, running lights, left turn and brake signal, and right turn and brake signal. You can also see we've got our fifth pole here. It looks a little bit different than a standard four-pole adapter.

This allows us to send a reverse light signal through this plug back to our trailer. In most applications, that's going to be used on marine trailers for the lockout circuit on surge brakes, but it can also to used to power backup lights on your trailer. So you've kind of got options there.Additionally to those things, helping it work for multiple trailers, it also has resistors that have been built in. On some vehicles, especially European vehicles that we see, when they have a factory seven-pole on them, if your trailer has LED lights, that causes a fast blink inside your car, and it causes a light out or a lamp out light to come on. With those resistors being built in, it's going to cause your vehicle to think that your trailer has incandescent lights on it.

LED lights are becoming very, very popular. They last a lot longer, and a lot of customers are switching over to them. So having this handy in the event that maybe you usually haul an incandescent trailer, but then borrow a trailer that has LEDs, that's going to stop that fast flash or that lamp out signal coming through.As far as the installation process, it's going to be just like a normal seven pole. The tab here on top is going to go right behind the tab that's on our cover. So this slides in till it stops.

The top comes down. We always want to confirm that is in behind that tab on the cover. At that point, we're ready to pull again either our four or five-pole trailer. Just like that.Now, one thing I've noticed in messing with this, is that when we pull out our trailer connector, you see how that middle part wiggles just a little bit Now, this has a lot of good customer reviews. No customers have mentioned any issues with that or anything.

But you can see it moves in just a little bit, and it comes out just a little bit. Just wanted you to be aware of it, so you didn't think yours might be messed up or something when you get it.Now as far as if it would be something that I would own, I definitely like it. I think it is a good product, especially if you have one of those vehicles where that lighting system has that lamp out monitor. I think it's going to save you a lot of headache. It's going to work on any vehicle, even if it doesn't have that situation, but it's going to help in those events that it does. I like having all five poles there, so if you ever pull somebody's marine trailer or you already have a marine trailer, you're not going to have to worry about the lockout signal. Overall, it's good quality. It feels good. There's not a cover that comes with it to cover the poles, so when not in use. Some of the adapters are going to have covers that'll go over them, keep them protected. This one does not. So this isn't something that I would leave on the back of my vehicle. This would be something I would have in there when I needed it, I would take out when I didn't.One thing to help extend the life of it, dielectric grease is critically important. Some people use it, some people don't. The people that use it really see the benefit from it. Basically, by adding grease to our terminals on both sides, we prevent moisture from getting in there, which kind of absorbs dirt. Once we've got wet dirt sitting in there, corrosion is going to be an issue.Just like most adapters out there, to help resist corrosion further, all of our connectors are going to have a nickel coating on it. That's just going to help to alleviate any of that corrosion issue, at least much better than brass does. But again, dielectric grease is a really good option.

Customer Reviews

7-Way to 5-Way/4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs - TR20141

Average Customer Rating:  4.8 out of 5 stars   (276 Customer Reviews)

Tow Ready 7-way connector to 5-way or 4-way flat connector is designed for use on vehicles with Trailer Lamp-Out sensors when towing a trailer equipped with LED lights.


I'll give this product 5 stars for obviously being of very high build quality although I won't be able to try it out until several weeks from now after an OEM hitch and wiring harness are installed on my new 2022 Porsche Cayenne. I bought this specific adapter because it is highly recommended by numerous users of a Porsche forum who have indicated that plugging it into the Porsche 7-way port disables the power open/close function of the rear lift gate. The purpose of disabling the power function of the lift gate is to prevent inadvertent power opening of the lift gate while carrying a hitch mounted bike rack or other accessory on the hitch receiver. The Cayenne, unlike many other vehicles with power lift gates, does not have a switch in the interior that disables the power function of the lift gate. A minor negative is that this adapter does not include a cover for the 4/5-way connector. That it does not have a cover makes some sense since most people will use this adaptor only when pulling a small trailer instead of using it to "fool" their vehicle into thinking that a trailer is being pulled when one is not. Since etrailer does not at this time sell a cover for a 5-way connector, I sourced one elsewhere and zip tied it to the adapter.


Does exactly what I need it to do. I now have turn signal and brake lights again on our 1UP bike rack. It fits our 2021 Mercedes Benz Sprinter chassis perfectly.


This is what I needed to get the trailer lights on the uhual working with my Mercedes GL. Worked perfectly on multiple occasions.


Before this device, my MB GL450 towed with hesitation, not at all like I was expecting. Plus I had running lights but NO

1. blinkers on back of trailer
2. no brake lights on back of trailer

and of course, that means I was a highway hazard of the worst kind.

This device plugged in gave me better towing as my GL 450 recognized there was a trailer behind it, full blinkers, full brake lights.

I am thrilled to be driving safely for myself, my family, and those around me!


Thanks for getting this to me. The trailer adapter works great. Appreciate your continuing effort to fill my order!!!


work great on dry i forgot to unplug when i took the jetski in ocean and stop working but i got two so im good and happy

Eddie - 04/08/2022


Great product and awesome communication..will keep buying from etrailer


Works exactly as advertised for our VW Touareg and trailer that now runs LED tails (which I happily bought from Ignore the wiring diagram on the packaging as it's wrong. has much better wiring diagrams and pin-outs that can be used.

A year later and it still works perfectly! Cant go wrong with this unit.
Toby - 04/29/2015


Had trouble finding the right part, then called eTrailer and problem solved immediately with this adapter.


From the start I have had issues with trailer lights on my Porsche Cayenne Turbo and whatever product I tried, it did not fix the problem. The plugs I ordered from plugged right in and fixed the problem between the LED trailer lighting and my Porsche. I hear it is a common issue on German vehicles, so I highly recommend this product to anyone. I couldn't be happier with the product itself AND the customer service from the staff all the way from the order, to confirming delivery. Thanks again!

Attached are a few pictures of the towing setup!


Discovered my Jeep had the wrong chip for new LED trailer lights, so I had a purchase the right chip to get this adapter working. After that, worked and still works like a charm. Still using it today. Thumbs up!

Adapter still working great a year later! It’s good to know of a company like etrailer, who cares about customer satisfaction. A+++
Glenn J - 09/25/2021


This product has worked perfectly. I was having problems with my trailer brakes not releasing when I put my MB GL450 in reverse. After searching the etrailer site I quickly learned that because my trailer had LED lights there was not enough resistance in the circuit to tell the care to engage the trailering function. Once I purchased this plug everything has worked flawlessly.

One year later everything still works great. Another great purchase from etrailer.
Don H - 07/25/2021


Good product at reasonable price. Does what it's supposed to do. Service was quick and information about delivery updated promptly. Will use them again when I need something.


You sent me the wrong part. I ordered a 5 way flat pin to a 4 way flat pin trap light adapter.


Called etrailer told them what I needed and said i thought a particular product would be right. They suggested another product as a better choice. I ordered what they suggested and it arrived sooner than promised. Hooked the trailer up using the adapter and everything worked great. Very satisfied. I highly recommend them.

Product works fine. No complaints
Craig I - 09/15/2015


Great product but took almost a year to recieve


Works great.


Perfect match for our Mercedes ML. Works perfectly.

I dont own trailer. We have always rented as needed. The adapter has worked perfecty.
Charles S - 11/26/2021


This resolved my issues with my 2007 BMW X5 3.0si. My trailer LED lights had just been blinking whenever the 4-pin flat plug was plugged into the round BMW adapter. The brake and turn signal lights still worked, but when nothing else was going on, or even when the lights were turned off, all the trailer lights just flashed constantly.

When I first plugged this in, the lights did the same thing. I unplugged it, reseated the 4-pin flat plug, then reseated the round adapter, and the trailer lights were still flashing. I turned on the car lights and tried the brake and signal lights. Trailer lights still flashing. I turned the headlights off, and the trailer lights went off! Brake lights and turn signals worked, and no flashing lights! Turned the headlights back on, clearance lights and tail lamps worked and no flashing! Brake lights and turn signals worked and no flashing! Cycled through everything a couple of times, and all was good - guess it just needed to get used to everything, but now it is working great!

This $15 piece saved a $4,000 investment, so I'm quite happy! It also showed up a day faster than expected, which made it even better. Pat was a very big help getting it selected and getting it here faster!

Ive had no problems with the trailer wiring adapter at all since I first started using it. Its rock-solid performance has really made me a happy camper. I just wish Id known about the problem a week before I bought the trailer! Its a great produce!
Dr D - 04/23/2015


Driving a '13 Escape, factory trailer tow package, pulling an Aluma tilt trailer w/ LED lights. When initiating signal light, it flashes rapidly w/ dash warning of trailer bulb failure + audible alarm. Also, stop/tail lights flash on/off as if hazard lights were on. I've researched several 'fixes' for a vehicle that is not programmed for pulling a trailer w/ LED lights: 1. connect in load resistors; 2. use wiring harness compatible w/ LED lights; 3. Ford has their own fix TSB-13-1-5 (which rewires the vehicle trailer tow package + adds different module. Not a good fix in my opinion).
From, I've ordered p/n: 30717 (Adaptor 4 pole to 7 pole vehicle end trailer connector), AND p/n: TR20141 (7 way to 5 and 4 way trailer adaptor for VW, Audi, Porsche towing trailers w/ LED lights). P/N: 30717 does require you to connect the white wire (ground) to a ground point (frame or metal bracket) on the tow vehicle. I did this with a flat 2 way connector I purchased at the local hardware store (just join both wires, they're going to ground anyway). In conclusion, yes, there are two connectors back there to support, I've just used small/short bungee cords to hold the connectors to the receiver hitch & the trailer tongue. I've also used dielectric grease between the different connectors. All in all, the trailer lights now work as they should, no vehicle dash warnings, no problems! Thanks etrailer for your support. Finally happy towing.

Ive towed the trailer several times with the two connectors purchased from etrailer and the lights are working perfectly.
Keith G - 09/19/2015


This solved the problem! I recently moved my license plate to a new location on the spare tire on the back door of my van. The new license plate spare tire mount included a white license plate running light as well as a new third brake light. Both were LEDs. I wanted to get things up and running quickly and figured rather than fishing around inside to find and tap into my wiring harnesses, because I have a trailer hitch I would go ahead and wire up a trailer wiring harness connector I had lying around. However, when I plugged it into my harness adapter at the hitch, nothing worked. Just faint flickering. Googled the problem with LEDs on trailers and came across this. Worked correctly out of the box!

Still working flawlessly after 1 year
Jeff - 10/30/2019


This is an amazing product. I purchased a new aluminum trailer and thought everything would be fine. LED lights, all the bells and whistles. I have a 2011 GL450 Mercedes SUV with a factory towing package Twin turbos and I thought I was set. When I picked up the trailer I found that not one light on the new trailer worked properly. I checked out the plug with a tester and the trailer light and the readings all looked good. They just would not work together. We goggled the problem and etrailers sight came up and had posts of others having similar problems. This new converter that etrailers sells is amazing. No problems now!


If you have a European SUV. Audi Porsche BMW Meecedes etc this will work like a charm. I bought a trailer with LED lights and when I connected it to my vehicle the trailer lights would not work. The would flash or not come on at all. It is because of the low current that LED lights produce. The vehicle sensors thing there is a light out and tries to locate it. This adapter bypasses the vehicle current sensor and allows the lights to function correctly. I tried shopping local but nobody had it. This was shipped fast and exactly what I needed. Thanks.

Working great. Still love it!!! Does the job
Richard H - 02/22/2016


This plug was purchased for my 2010 Porsche Cayenne S and works perfectly with my boat trailer that has LED lights. I originally had a more generic plug and the LED lights on the trailer seemed way too bright. I would also get a momentary warning about the lights system when starting the car. Now that I have this specific plug, I no longer get the warnings and the trailer lights operate at the proper intensity. Exactly what I needed for my set-up!

Your product has worked perfectly for me for the past year. I do not tow very often, but when I do, the connector provides exactly what I need to properly connect the LED lighting system and brake system on the trailer to my 2010 Porsche Cayenne S.
Mark A - 09/10/2014


I bought this product because my Tesla Model X would not recognize the LED lights on my hitch-mounted cargo carrier. I was going to make this adapter myself but am now glad that I did not.

My first thought upon unpacking the product was that it looked and felt like a quality product. The product worked as expected.

Thank you for a quality product!

It’s still working great!
Ron - 04/27/2018

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