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2-to-3 ConverterItem # 118158
Retail:$33.60
Our Price: $24.10
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Used when a motorhome with a 2-wire system is towing another vehicle with a 3-wire system, by way of a tow bar.
Features:
Note: You will need to install a tail light isolating diode system (38955) and 2 additional diodes (RM-792) with this tail light converter to prevent electrical feedback when flat towing a vehicle. Vehicles with separate turn signals and brake lights will need a total of 6 diodes.
Installation Details 
California residents: click here
Video of Vehicle to Vehicle Tail Light Converter
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Average Customer Rating: 4.8 out of 5 stars (90 Customer Reviews)
Used when a motorhome with a 2-wire system is towing another vehicle with a 3-wire system, by way of a tow bar.
This product was used to separate the brake light signal from the turn light signal on a Ford F-350 cab/chassis with a flatbed to facilitate using amber turn signals without them illuminating when the brakes are applied (truck only, no trailer). So far they are "functioning as designed" and I'm very happy with the product. 572713
Still working fine.
Gregory V - 10/09/2019I use Optronics oval LED lighting exclusively and I don't think this was made to work with them because of the rapid response of the LEDs. I use this so that on a 4 wire system I can have turn signals on the side of the trailer. When you first hit the brakes, there is a fast blip of light from the side marker/turn signals. With an incandescent bulb it would be too fast to light the bulb. This is something I can live with. I think this works great with no problems so far. 524581
I used this box to stop my third brake light from blinking on my 74 Ford Bronco. Worked perfectly! 471723
Great product and the price was lower than expected. 341569
I just got done installing it today it worked as described and was very easy to install I highly recommend this product 336690
I purchased this tail light converter over a year ago. This eliminated the problem of electrically connecting a European trailer to my U.S. spec Dodge Dakota truck. It was easy to install and works perfectly. I also appreciate etrailer waiting a year before asking me to review this product as most on line vendors ask for a review before the item is received. 315088
This converter worked great for what I intended it for. I was wanting to add a third brake light to back of my fifth wheel trailer. I purchased STL179RB Glolight Thinline LED also. I tried to wire this direct. It won't work, it flashes when you turn the turn signal on. A friend of mine recommended this after doing a search on the etrailer website. Etrailer support recommendation was installing two lights. Duh! that's why I wanted a third brake light, I already have two lights that function as stop/tail/turn. The installation in these pictures is not complete. I was trying to avoid drilling holes in the back of my trailer, I still may have to. I am going to enclose the wires going up the trailer to the light in some white wire loom. The light at present is secured with only white RTV, not sure that will hold. I'm still trying to avoid drilling new holes, may have to though. I hooked up all the wires on the input side, white to ground, green to right stop/turn, yellow to left stop/turn. I hooked only the red wire to red wire of the light on the output side. I hooked the ground (white wire) of light to input side of converter. Yes, it works and no it does not blink when either blinker is turned on. The additional two wires on the output side of converter are not being used nor is the additional wire of the light. Sorry for the long review, don't usually write reviews at all. Anyway, if this will help even one person it will be worth it. 428692
I like having my trailer lights showing my trun direction and then also show that I have applied the brakes. This units splits the signal and works great. Real easy to wire in. You will probably need to only run one wire to add the brake light function. 344326
This is a very useful device for those of us who flat tow auxiliary vehicles, such as a tracker behind a motorhome or whatever. Also it is easy to install. Keith 406122
converter works well. I have had no problems. I use dielectric silicone grease on all connections.
Keith K - 07/15/2018I used this to change the wiring and harness on a European trailer to work with my standard US 4-pin trailer outlet. Pretty simple and straight forward with the diagrams and write-ups that I found on this site. 489560
The parts are still on my European trailer and working well! The trailer is a German brand and started its life there in Germany being pulled by my American-spec Jeep Wrangler. The trailer’s wiring and the Jeep’s connections needed to be massaged in order to work. The parts I ordered from etrailer and the writeups for the project on your site made it all possible. Now the trailer is titled and registered in Virginia and enjoying its life on this side of the Pacific!
Aaron - 03/27/2019Holding up very well. I built an adapter for my German trailer and with the help of your department and your products was able to save myself about 300 euro. Much thanks! 472165
I was looking for a way to add a third tail light to a vintage trailer and this proved to be just the ticket. Easy to install and worked great right out of the box. Plenty of communications from etrailer staff along the way. Just wish they would provide tracking info so you could plan for expected receipt date. 97067
Unfortunately this did not work for my purpose, not that the product was at fault. I was trying to retain the amber turn signals on my vehicle when flat towing but what I found is the Motorhome already has a taillight converter in the system because it too has amber turn signals. the two converters did not get along. I had to remove it and rewire to combined signal and brake lights 583040
Installed and forgot about it. It was easy to wire up and has been working perfectly since. RV is combined turn and stop lights. VW has separate amber turn lights. 476281
First off the customer service at etrailer is by far the best that I have dealt with. If I had a question, they sent me an email response very quickly. Secondly, the shipping is extremely fast. I placed the order and it came to an APO AE address (military stationed in Germany) via USPS Priority Mail and it arrived in like 5-7 days, I was shocked when it arrived, because I was expecting at least another 3 or 4 days. So, as far as the product. Works great and was just what was needed. Project was to make an adapter that I could plug into my 2017 Jeep Grand Cherokee U.S. spec and use a German trailer. My friend did all of the wiring and made the adapter, so I do not take any credit for any of it. Just sharing this, to those trying to figure out if it can be done. Moving on, the adapter is a 7 pin/blade normal American plug that goes into the back of the JGC and the other end of the adapter is the 13 pin German (European) socket. We tried it without this product and all worked except when you hit the brakes the brake lights were faded and the blinker lights were lit up as if they were the brake lights. So, had to get this product and separate the brake/blinker light on the American side and have separate brake and turn wires on the German side. Put this product between the two in the middle of the adapter, wired it up and all works great! I used 2 zip ties around the product and a bunch of electrical tape to hold it to the adapter, at least to give it a better look. Now I only have to plug in the adapter whenever I use a German trailer and all works correct. When done towing, remove the adapter and everything is back to the American system. Did not have to cut/splice or do anything to the wires on the JGC or the trailer, all was done at the adapter. Thanks again to etrailer for providing awesome customer support and shipping! Jeff 397630
I gave up trying to find a wire to tap for a third brake light on a 2013 GMC Sierra, so I ordered a 2 to 3 wire adapter ( #118158) as recommended by you expert Michael H. He stated that only one of the inputs was needed, but both Left and Right turn were required to make mine work at all. That aside, the product was received quickly and installation was simple using the enclosed diagrams. I have never seen anything mentioned anywhere about waterproofing undervehicle connections. I do and they last for years. 108554
Does the 3rd brake light flash when using the hazard lights?
-- comment by: Sam - 05/06/2015Yes, emergency flashers will flash the third light also.
-- comment by: - 05/24/2015I mounted a juction box on the front of the trailer and connected my 4-wire trailer connection to it. From this box I ran a ground wire to all lights and to the convertor input, the green right turn/stop to the convertor input, the yellow left turn/stop to the convertor input, the brown to my tail lights, license plate light, marker lights and clearance lights. I ran the 3 wires from the convertor output to another juction box. I connected the green right turn to the right amber light, the yellow left turn to the left amber light, the red brake to the red right and left brake light and the third brake light. No diodes needed. I'm using your Bargman LED Double tail light Red and Amber and Bargman wraparound clearance/side marker red on rear amber on front. You people at etrailer are "THE BEST". I believe you are the only outfit that knows your products and can tell us how to install them! 12888
Interested in adding a third light up higher on your trailer for additional visibility? This product will separate the turn signal and brake signal on a four pin connector so you can add a running and brake light up higher to be visible. Simulates the third light that most cars and trucks have these days in the center of the back window. Positive for the semi-trucks visibility. You do not really think they can see the normal trailer lights 12" off the ground when following close behind or coming over a hill do you? Included a picture with just the running lights illuminated. Thank you etrailer for having the right products in stock! Most other dealers did not know what I was talking about and one even told me it was against the law. Called state highway patrol and they encouraged the additional third light! I also added the higher side running lights when semi's are merging behind you at night. 563855
Shipping was fast. Installation was easy. Works as designed. Couldnt ask for a better result. Now my tow car is all wired correctly. 728438
This is the second time ordering from etrailer. Both experiences have exceeded my expectations. Items were as described and arrived quickly. Customer service is great too. This is the place to go for all your trailer needs. I highly recommend. 705451
Parts stores had no idea this item was available. etrailer.com had it is stock. Now I can tow my trailer with any vehicle. 683391
I like this product, and it was easy to connect for a third (3rd) brake light on our travel trailer. 683186
Excellent customer service. Excellent product quality and etrailer cares that you are satisfied. We hope to be purchasing more products soon. Would highly recommend etrailer. 616619
I tried wiring this to a current model F-150 to attempt to separate the brake signal out at the rear from the indicators. It didn't do as it was supposed to in this situation. most likely due to the sensitive circuits in this vehicle as it would send faults up on the dash display. but also didn't seem to operate correctly either. Also made a heck of a noise when mounted in the cabin so i would suggest mounting it externally. I assume it will be suitable in older vehicles. 607880
Easy to use and install with on line videos and Q & As. I used it to install a 3rd taillight/brake light on my motorcycle trailer. 592024
It's been a year already? Product is working great. I have had no issues what so ever. Am very happy with the quality and durability of this product. 579868
I purchased this converter to use with a small trailer that I haul with a motorcycle, and sometimes with a truck. The trailer was set up to have separate turn and stop signal lights. This allowed me to use it with the four wire harness for the truck as well. Very satisfied with this purchase 573364
Product arrived fast and was as adverti sed. 561241
It works!!used it to get the third brake light working on my 2013 Silverado and it works just fine. Module is just small enough to actually mount inside the left tail light well. 557319
worked great for wiring in the 3rd brake light on my topper 549464
Great stuff , the guys and gals at etrailer are super awesome, thanks 523321
Great service on a part I wasn't aware was available. Was going to use a 7 pin adapter to power seperate lights on a little camp trailer. This will simplify my needs. Thanks.. 519348
Jameson’s answer was right on and 118158 works great to isolate the brake light from the right and left directional wires in a 7 wire plug from tow vehicle. Would be a 5 star except the 118158 I ordered from etrailer never came. After a month and despite having great conversations with George, Nikki and Dean, ordered another from manufacturer and got it in 4 days. 518069
I received the trailer wiring adapter in just a couple days. It contained very easy instructions and the wiring leads were a very generous length. It only took me a few minutes to install and it works perfectly. Thank you ! 512886
Fantastic !! Works perfectly, no problems whatsoever
Tyler - 05/25/2019Easy painless installation! I used this product to install a third brake light on my TC Teardrop camper. 492604
Worked for my application. Used to convert a American 4 prong to a Euro plug. 491409
The product looked just as advertised and was installed on my 2001 F250 just as the directions indicated. It did not work. Many attempts were made trying different wiring methods yet the product made 0 difference. It was put back in its box and thrown on a shop shelf as it was not worth the $$ to return. 470087
Worked great very happy thank u 466745
We needed a way to get our 4 wire vehicles to function with a 5 wire trailer, this item fixed that perfect ally. 453655
Worked perfect to add a second overhead rear brake light. 447477
Fast Shipping, will shop again for sure. 447420
This converter worked great! I was able to get the lights on my LX470 working in sync with my ARB bumper lights. 442319
Good quality products. They were delivied very quickly. The staff at etrailer were always helpful. 419458
So far this product works as described but it may take a little bit to get it to work correctly. The biggest problem I had was mixing incandescent and LED lights by mistake. This will only work with LED light. Hopes are high that it will be a high quality product that lasts a long time. By the way the tech support guy that helped me out was great! 406664
Fast shipping Product worked exactly as advertised. This is the module used when you put a topper on your truck and need to wire in the third brake light on the topper. Anything else and your third brake light will flash with the turn signal. This also makes the third brake light on the topper work with your hazard warning flashers. 396457
Easy to install and works as designed. Easy way to install a third brake light and make your rig more visible. I would order again! Used mine on my 5th wheel camper. 378742
Works perfectly, solved my issue of needing both European and US standard lighting harnesses for towing in Germany and the states. 376394
Very easy to install and it did exactly what was needed. 365630
Good product works well adhesive is lacking but great product recommend for any trailer 348992
This product works very well. I am using it on a snowmobile trailer. I enclosed it in a small watertight receptacle box and mounted it underneath the trailer. I did this because it was easier to mount the box and to protect the unit from salt. The unit comes with sticky back tape however, with salt and debris I felt it better to put the unit in a receptacle box. I cannot comment on the durability because I just installed it, but it is really working well and is exactly what I wanted for the "third" brake light... another etrailer addition to my trailer. 339846
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