Videos are provided As a guide only. Refer To manufacturer
installation instructions And specs For complete information.
Tow Ready 7-way connector to 5-way or 4-way flat connector is designed for use on vehicles with Trailer Lamp-Out sensors - Audi, Mercedes-Benz, and Volkswagen vehicles with the factory tow package - when towing a trailer equipped with LED lights.
Video of 7-Way to 5-Way and 4-Way Trailer Adapter for VW, Audi and Porsche Towing Trailers with LED Lights
Videos are provided As a guide only. Refer To manufacturer
installation instructions And specs For complete information.
Today we're going to review part number TR20141. This is the Tow Ready 7 way to 4 way and 5 way adapter LED lamp out bypass adapter for the Audi, Volkswagen, Mercedes, and Porsche. This adapter was designed to work with the Volkswagen, Audi, Mercedes, and Porsche vehicles and any other vehicles that otherwise not compatible when towing a trailer with LED lights. Basically on those vehicles, there's not enough draw from the LED lights on the trailer and the vehicle thinks there's a bulb out and will produce a warning lamp. This adapter actually has load resisters on the inside and that will simulate additional loads so that it does not happen and the lights will work on your trailer. This adapter will plug into your factor 7 way on your tow vehicle and allow you to plug in back here either a 4 way or a 5 way connector on a trailer. You'll notice there is 5 plugs and the 4 way, you just eliminate that end one. You always use the ground one, so when you plug in the 4 way you'll just not be using that end plug right there. That should do it for the review on part number TR20141.
The Tow Ready 7 way to 4 and 5 way adapter LED lamp out bypass adapter for the Audi, Volkswagen, Mercedes, and Porsche vehicles. .
Average Customer Rating: 4.8 out of 5 stars (98 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 - Audi, Mercedes-Benz, and Volkswagen vehicles with the factory tow package - when towing a trailer equipped with LED lights.
by: Keith G.09/19/2014
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 etrailer.com, 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. 152198
by: Dr Dave04/22/2014
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! 126557
I have a 2012 Mercedes GL550. Using the standard 7/4 adapter the trailer lights would flash, cancel the blind spot sensors and trip the bulb monitor. After researching this the problem lies all over the place and not with one model either. The blind spot mirror issue is in the owners manual but not trailering section. Using this adapter it stops the flashing trailer lights but the trailer lamp out persists on the dash. This problem is inherent to many late model German automobiles on a hit and miss basis. VW, BMW, Mercedes and Porsche. On my 2011 GL450 this problem was not present, but on my 2012 GL550 it is. Mercedes was on no help at least my servicing dealer was of no help. The selling dealer said he knew of the problem but recommended a trailer shop for further help. The trailer shop says it's the vehicle and not the trailer as they sell to these customers all the time. I've not seen too many of these buyers pulling trailers! They suggested installing resistors in the trailer wiring. I'm not inclined to doing so. The trailer works great on my other two vehicles. The Benz is what the problem is! But like everything in Benz fashion. I'll be dead and gone before they even care there's a problem! 214690
by: Mark A.09/06/2013
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! 98630
by: Juan J.06/24/2014
Product arrived promptly and is exactly as described. On my 2009 Mercedes ML550 this is REQUIRED if you want to rent any trailers with LED lights at U-Haul. Beware the dimwits at U-Haul as they have NO CLUE what they are doing. eTrailer.Com has this priced at HALF what U-Haul charges, and they don't even know Mercedes cars need them! 137343
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. 175517
This was the fix for towing a trailer with LED's from my Mercedes ML550, which the dealership knew nothing about and only said the SUV was good so problem must be in the trailer. 145652
Works exactly as advertised for our VW Touareg and trailer that now runs LED tails (which I happily bought from etrailer.com). Ignore the wiring diagram on the packaging as it's wrong. etrailer.com has much better wiring diagrams and pin-outs that can be used. 127608
by: Craig I09/15/2014
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. 151189
Great product! I got a new boat this year with LEDs on the trailer. I couldn't figure out why the trailer lights wouldn't work with my 2012 MB GL450. I even went to the MB dealer and the parts guy was unaware of the issue. This adapter also works with my other trailer with incandescent lights. 230668
by: Eric J.09/30/2013
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 www.Etrailer.com 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! 102018
You NEED this if you have a Mercedes SUV and plan to pull a trailer with LED lights. It will not work with a straight 7 to 4/5 adapter that does not have the load resistors. Mercedes (and many other makers) have made the vehicles way too smart for their own good. With a standard connector you will get all manner of alarms. Not will you get alarms for bulb failures on the trailer, but also since it uses the presence of a plug in the trailer connector to put the drive train into trailer mode, it will keep dithering between trailer and non trailer mode. This also means that you have to remove the adapter if you are not actively pulling a trailer. This is not a problem with the adapter, it is due to the software in the drive train controls. 248056
Simple solution to an annoying problems - my trailer had LED lights and the turn signals would blink ultra-fast; also, my tow vehicle - 2007 VW Touareg - would constantly tell me the trailer lights were not working properly. My trailer had a flat 4-pin connector and the vehicle had both flat-4 and round 7-pin connectors. I plugged the adapter into the vehicle and the trailer into the adapter and everything worked perfectly. The only alteration I had to make was a simple cut in my trailer's flat-4 connector so it would slide onto the adapter (the adapter is setup for either a 4-pin or 5-pin but the 4th pin on your 4-pin connector must be exposed to fit - a simple cut with a utility knife removed the end on the trailer connector). 183251
A year ago I purchased this adapter to connect a 2006 Mercedes Benz ML 350 to a small tag along trailer that I had recently upgraded by replacing the original trailer light bulbs with LED trailer lights. When I connected the new LED trailer lights to the vehicle, the lights would not illuminate properly. After checking my wiring and doing some research, I discovered that this Mercedes had problems detecting the low current associated with the LED bulbs, essentially causing the vehicle to "think" that bulbs were not illuminating properly. I purchased this adapter from etrailer and the vehicle lights and the LED trailer lights have functioned perfectly ever since. I wish all fixes were this easy! 253742
After buying a 2015 2.7L ecoboost F150 I found that the "Auto start stop" was a bit annoying.... Did a little research and found that if you have a trailer plugged into the trailer wiring it deactivates the feature. So, I bought an LED hitch light and the factory towing control of the truck would inform me that my trailer lights was out. left, right turns, stop etc.... So, after googling i found this website and they had this adapter that was made for foreign vehicles. After reading the reviews i found someone had used this on a newer model ford that had the same problem. So, i bought it and installed it and everything worked GREAT!! GREAT PRODUCT!! 241251
by: Patrick L.07/17/2014
I have a 2012 Navion RV (Sprinter chassis, Mercedes drive train). Becuse the trailer wiring feeds into a dedicated module, it is not possible to connect a trailer with LED lights. The lights on the trailer will not work because the LEDs do not demand enough power to trigger the regulator on the module. I ordered the TR 20141from e-trailer. It converts from a 5 or 6 flat to a 7 round. Built into this plug are resistors that increase the demand on the module as would incandescent lights on a trailer. The TR 20141 solved the problem. It is well made, easy to wire and is reasonably priced. Very satisfied with delivery too. No fear with e-trailer. 141757
by: Bill T07/04/2015
I recently purchased a new PWC with a trailer that has LED lights. When we connected the trailer to our ML 350 the trailer lights would not work. The dealer had no idea why. Our other boat trailer worked when connected to the Mercedes. So after many net searches and purchasing three 7 to 4 pin adapters that did not work, I happened upon the etrailer web site. Their info was excellent explaining that Mercedes, Porches, and Volkswagen cars needed a resistive load in order to work with a trailer that has LED lights. The TR20141 worked perfectly. Their customer service is excellent! 209319
by: lee a09/08/2014
Just what I needed. Thanks 150358
by: Bob S06/15/2016
Could not get tow dolly lights (LED) to work correctly from MB Sprinter Chasis RV. Regular 7 way to 4 way flat adapter did not work. No one had a clue...found this adapter on your web sight. Looked like the solution. Trailer shipped immediately, I received in 3 days, plugged it in and now everything works as it should. Wish more people knew about this problem and carried this adapter. There are increasing numbers of trailers with LED lights as well as Mercedes Sprinter Chasis RV's. 261566
by: Bo shaw04/14/2012
Wast of money, stops blinking temporarily, until your fuses blow......does not solve led problem when hooked up to range rover, bo 37238
by: Barry J02/04/2014
On my Touareg (2004 model) with a trailer with LED lights hooked up, I would get "CHECK LIGHTS" flashing on the dash and an annoying DING! from the dash every 15 seconds. That's enough to drive you mad! A Cayenne or Audi Q7 would do the same, fyi. After researching online, this seemed to be the adapter I needed to add the right resistance to prevent the warning from appearing, and it worked! No more warning, no more annoying chime. And the price was great too. Thumbs up! 115646
Shipment was fast. Received in just under a week from when I ordered! Adaptor corrected my flashing parking lamp problem and everything now works as it should. Only issue was is that I was unable to use the tracking feature on the website to see where my package was or when it would arrive...since I received it pretty quickly, that was really not that big a deal but probably something that could be improved....I would definitely do business here again!!! 114536
etrailer provided a level of service that I have not seen in a company since gas station employees used to run out, pump your gas, wash your windows and check your oil. Seriously, this company could be a case study in the harvard business school review. They could run a secondary business teaching other companies how to provide the best customer service on the planet. Well done etrailer!! Looking forward to making more purchasing with this company. 122716
etrailer provided a level of service that I have not seen in a company since gas station employees used to run out, pump your gas, wash your windows and check your oil. Seriously, this company could be a case study in the harvard business school review. They could run a secondary business teaching other companies how to provide the best customer service on the planet. Well done etrailer!! Looking forward to making more purchasing with this company. 122715
by: Peter D08/31/2015
I was extremely happy to find this company who created economical solutions for unexpected challenges. A few weeks ago I was unable to rent from UHAUL because my 2010 MB ML was unable to control the new LED trailers. I had to look for a trailer with incandescent lamps. This is a must piece that UHAIL could easily stock and provide an enhanced service to its customers. Keep up the good work and I wish you lots of success. 223119
by: Namal Raigama08/06/2015
I have 2012 Mercedes GL350 and I have to rent a UHAL trailer which has LED lights. None of the 7 way to 4 way adapters in the market worked to connect the trailer, and all were giving false indications. UHAL or Mercedes dealerships did not know what to do, and refer the problem to the other party. This adapter was the solution, and etrailer shipped the product very fast. I am so glad I get with etrailer. Thank you. 217328
by: Rob Fortney09/14/2013
I called and asked if this would work for an '06 Range Rover Sport SC. "Oh, sure." was the response. First of all it doesn't even fit through the opening in the bumper. However I was so desperate for a solution to the "flashing" problem, I partially removed the bumper cover so I could insert the plug. Sadly.......It doesn't stop the "flashing". In other words......It Don't Work!!! 99913
by: Pete P04/19/2016
If you have a Mercedes or one of the newer cars and attempt to use your trailer with LED lights you will want one of these. I hooked my ATV trailer up to my Mercedes 450 GL and the lights on the Mercedes starting to flash. I searched for the problem on the inter-net and found the adapters are a must. Fortunately etrailer was a solution. Came quickly and totally solved the problem. 245999
I am well pleased with the product. It worked as expected. The delivery was quick. The online product description listed Audi, Porsche, and VW but not Mercedes. The packaging listed Mercedes. It might help to add that to the online description. The Mercedes dealer sent me to U-Haul for the adapter. They did not have one in stock and it 29.95. I love to save money! 143511
by: Julie F08/16/2012
Finally found the adapter that fits my car. I have a Mercedes 550 ML And I went to the Mercedes dealer to buy and adapter and was told they did not make the part. So I called e trailer and they sent me the adapter they had it in stock, now I can go to the Florida Keys hauling my trailer (2 Yahama SHO) thanks to the great help from the people at e trailer. 52000
by: Jamie L.07/31/2012
Used on my 2008 BMW X5 and trailer with LED lights. Before I used this, my BMW didn't even recognize the trailer and power the lights at all. Using this device, the BMW's computer still "thought" only the running lights were burned out and had a little triangle warning on the dash, but everything worked just fine. Turn signals flashed at a regular rate. 49985
The Adapter worked, but my Audi did not like having a hitch light. With the hitch light plugged in, my Audi Q5 made several changes in it's configuration assuming it was pulling a trailer. I have put a request into Audi to allow the ability to override the changing to trailer configuration when only a hitch light is installed. 303401
by: Daniel J.08/12/2014
RE: TR20141 - Trailer Adapter The eTrailer adapter has saved the day. It allows use of LED trailer lights when towing with a Mercedes ML. Without the adapter I would be out of luck. eTrailer provided a prompt response and delivery, the product design and manufacture is of high quality, and the function flawless. 146201
by: Don B.10/12/2012
This is a fantastic product. It save me $120.00 to have a special wiring harness installed on my Mercedes M 350 to enable the LED lights of a U-Haul trailer. Just plug it into the Mercedes factory installed trailer light socket and it provides the proper resistance for the system to read and light the LED trailer lights. 57068
by: Philip B.02/05/2014
The adapter I ordered was exactly what I needed. The best part was the customer service from etrailer.com. You don't see the kind of attention placed on big orders from other suppliers as was placed on this single adapter. Very satisfied and will tell anyone looking for a great supplier this is the place. 115825
by: Richard D.06/07/2016
It works!! Searched high and low all over NE Louisiana and could not find this plug anywhere in stock. None of the trailer stores or any of the auto parts stores. Glad you guys had it; I can now hook up my ML350 to any of the rental trailers that have LED lights and I am 'made in the shade'! 258476
by: John S.05/07/2014
Works for Volvo as well. LED equipped trailers would still signal properly connected to XC90's with factory trailer wiring, but the in-dash towing indicator would not blink. This product solved the problem so the transmission can make shifting adjustments for towing. 129390
by: David S.09/10/2013
I recently upgraded my boat trailer to LED lights only to find that they would not work when attached to my 2010 Mercedes ML 350. After researching possible solutions I ordered the trailer adapter (Item: TR20141). Problem solved. Thanks for helping me find a solution. 99225
Product immediately solved the problem with fast flashing turn signals on trailer that was converted to LED lights. Didn't know where to start until I found a thread from etrailer on this exact problem on same/similar vehicles. Used on 2011 TDI Touareg 227177
by: Will O06/30/2015
The staff at etrailer were very helpful. She knew at once what the problem was and was able to select the part to correct it. Anyone having issues hooking up to trailers with LEDs should try this product before resorting to ECM reprogramming, etc. 208421
by: Jeff D.07/26/2016
The product works perfectly with our Audi Q5 and the advice provided by the etrailer team regarding this part for our need was very quick and absolutely correct. (ability to connect to a flat connector on a utility trailer) thank you 276540
by: Richard H.05/02/2016
I'm so glad the information explaining the need for an LED specific adapter plug was on your website. This plug works perfectly on my 2015 Audi Q5 when renting a trailer. If it works there, it should work anywhere. Great product! 248121
by: Resister connector for ML08/02/2015
Very happy with product. It is a shame Mercedes does not supply one with the ML! Delivery was very quick - 2 days from the time I ordered and when I did order.... a live person on the phone- BONUS! Thanks guys! 216231
by: David G.05/23/2013
Fixed the problem immediately. Don't waste your time looking for other solutions or locally for this product. Order online NOW. It fixed a problem where the trailer lights flash with a MB GL450. Thanks!! 81706
by: Ed D.07/15/2016
The unit arrived in the time frame promised and was in great condition. This helped solved the light issues that I was having while pulling a boat trailer w/LED lights with my 2010 Porsche Cayenne GTS. 272137
by: A. White06/03/2013
Great product... just plug and play... Have 2 trailers, one with incandescent light and one with LED lights. Had problems with the LED, until I ordered this adapter. Immediately solved the issue 82992
by: Scott B.06/08/2012
I use this adaptor on my 2005 BMW X3 with a factory BMW hitch kit pulling a boat trailer that is set up with LED lights. Works perfect now as turn signals no longer flash rapidly. 43410
by: Fred S.07/01/2015
Have relied on this connector for use with ML pulling boat with LED lights. Found it through etrailer.com even though neither boat dealer nor Merc. dealer knew problem. 208642
by: Ira S.03/24/2015
I had an issue where my brake lights weren't working and I had a warning light on the dash about the left trailer brake light. This adapter cured all! 2010 VW Tiguan. 180632
by: Jaymie R10/24/2016
Everything arrived on time and in great shape. I love all the tutorial, tips and other helpful videos and links. This place is great. I'll definitely be back. 312512
Ask the Experts about this Tow Ready Wiring
Do you have a question about this Wiring?
At etrailer.com we guarantee:
Highest quality wiring for the best price.
Real product know-how.
Most detailed, accurate wiring information available.
Information for this part was:
Installations, made easy.
Personalized service for life.
Trusted since 1946.
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.