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Vehicle to Vehicle Tail Light Converter

Vehicle to Vehicle Tail Light Converter

Item # 118158
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Tow Ready Wiring - 118158
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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. Lowest Prices for the best wiring from Tow Ready. Vehicle to Vehicle Tail Light Converter part number 118158 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Tow Ready Wiring - 118158

  • Trailer Connectors
  • Converters
  • 2-to-3 Converter
  • Tow Ready

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:

  • Used when a motorhome is towing another vehicle by way of a tow bar
    • If the towing vehicle has a 2-wire system and the vehicle being towed is on a 3-wire system (the vehicle has amber turn signals, separate from the brake signals), the vehicle to vehicle tail light converter will need to be used
  • This item cannot be installed backwards (the input going to the output side) to convert a tow vehicle down
  • Will not work with vehicles that have LED tail lights
  • Limited 1-year warranty


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.



118158 Vehicle to Vehicle Taillight Converter

Replaces 31820

Installation Details 118158 Installation instructions


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.




Video Transcript for Tow Ready Tow Bar Wiring 118158 Review


Customer Reviews

Vehicle to Vehicle Tail Light Converter - 118158

Average Customer Rating:  4.8 out of 5 stars   (93 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.

- 118158
by:

I used this box to stop my third brake light from blinking on my 74 Ford Bronco. Worked perfectly! 471723



- 118158
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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


Comments
Still working fine.
Gregory V - 10/09/2019

62769

- 118158
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Great product and the price was lower than expected. 341569



- 118158
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I just got done installing it today it worked as described and was very easy to install I highly recommend this product 336690



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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



- 118158
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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



- 118158
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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



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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


Comments
converter works well. I have had no problems. I use dielectric silicone grease on all connections.
Keith K - 07/15/2018

40945

- 118158
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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



- 118158
by:

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


Comments
Does the 3rd brake light flash when using the hazard lights?
-- comment by: Sam - 05/06/2015

11440
Comments
Yes, emergency flashers will flash the third light also.
-- comment by: - 05/24/2015

12007

- 118158
by:

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



- 118158
by:

I 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


Comments
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 - 03/27/2019

51092

- 118158
by:

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



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by:

I 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



- 118158
by:

I 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



- 118158
by:

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



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Holding 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



- 118158
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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



- 118158
by:

I installed a European 13pin receiver on a 2018 Ford Explorer and stowed the wiring adapter under the vehicle. Worked flawlessly so far with caravans and bike carriers. 759280



- 118158
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The standard hookup didn't work be cause my trailer has European lights. So I looked up on the interweb and found the information etrailer. I got the converter and hooked it up this weekend. Everything is well labeled and tied together well. Thanks 758794



- 118158
by:

Great product & great service. Guys keep up the good work. Thanks Rick 735067



- 118158
by:

Shipping was fast. Installation was easy. Works as designed. Couldnt ask for a better result. Now my tow car is all wired correctly. 728438



- 118158
by:

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



- 118158
by:

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



- 118158
by:

I like this product, and it was easy to connect for a third (3rd) brake light on our travel trailer. 683186


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Ask the Experts about this Tow Ready Wiring

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    If both your motorhome and towed vehicle have a 3-wire system (separate stop and tail lights), then a converter like the Tow Ready # 118158 should not actually be needed. The converter is only needed if your motorhome has a 2-wire system (combined stop and tail lights) and your towed vehicle has the separate, 3-wire system. I have attached a wiring diagram that shows exactly how the kit should be installed for your specific application, where both the motorhome and vehicle have a separate...
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  • Can 2-Wire to 3-Wire Tail Light Converter be Used on a Vehicle Just to Separate Signals
    You can use a 2-wire to 3-wire tail ilght converter to separte the brake and turn signals on your 2017 Jetta. I recommend using the Curt, part # C56196, because the Tow Ready, part # 118158, is not compatible with LED lights. Basically, you connect your combined right brake and turn signal wire to the green wire on the conveter's input side, and your left brake and turn signal to the yellow wire on the converter's input side. Then ground the white wire to the Jetta's frame. On...
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  • Adapter for Truck Wiring To Wire Third Brake Light of Camper Shell
    What you can do is use the converter box part # 118158 wired to either you taillight wiring or trailer wiring and you'll have a dedicated stoplight circuit on the red wire. If you ground the white wire and then run the green wire to the right turn circuit and the yellow to the left turn on the input side of the box the red wire on the output side of the box will have just the stoplight.
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  • 3 Wire to 2 Wire Converter to Combine Separate Brake Light and Turn Signal Circuits
    Vehicle to Vehicle Tail Light Converter # 118158 and the Curt version, # C56196, both take combined brake light and turn signal circuits and separate them out. You are looking for the opposite which is basically what any trailer wiring harness with a converter for a vehicle will do. If this is for a flat tow set up or an application other than towing a trailer you could use Brite-Lite converter # RM-732. If it is going on a vehicle to tow a trailer then I would need to know the year,...
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  • Tail Light Converter for 2013 Ford F-150 for Brake Light Signal for 3rd Brake Light on Truck Cap
    The wiring on your truck combines the stop and turn light signals since that is how trailers are usually set up. Trailer wiring has these two different signals combined into the same circuit, one for the left side of the trailer and one for the right. Since you want to have a stop light signal by itself to connect it to a truck cap 3rd brake light you'll need to use a tail light converter such as Tow Ready # 118158 or Curt # C56196 to separate out the stop light signal. This way the...
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  • Parts Needed to Connect European 7-Pin to U.S. 4-Way Flat
    There are a few parts you will need, and this will require you cutting off your European 7-pin. First, you'll need a U.S. 4-way, the Hopkins Endurance 4-Way Flat Trailer Connector # HM48110, along with Converter # 118158. If you take a look at the accompanying diagram, you can see exactly how to wire the converter to the 4-way and you will need to do this with Butt Connectors - 22-18 Gauge # DW05743-5 and 16-14 Gauge # DW05744-5.
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  • Parts Needed to Add 3rd Brake Light to Small Utility Trailer with 4-Pole Wiring
    To add a 3rd brake light to a trailer's existing lighting will require a signal converter to separate out the brake signal from the turn signals that are combined by trailer wiring. You need the converter # 118158 to provide a brake-only output signal to prevent the 3rd brake light from flashing like a turn signal. In your particular application you will not need diodes but you may need a load resistor # P230004C to let the high-efficiency LED brake light function correctly with other...
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  • Ways to Convert Trailer to LED Type Lighting
    You can convert your RV to separate turn signals and/or LED operation in a couple of ways, depending on how much wiring modification you care to do. Any of your existing lights can be converted to LED operation by swapping out the incandescent bulbs for LED-type replacement elements. We have LED equivalents that are drop-in replacements for many popular standard bulbs. All appear on the linked page and can be selected by bulb number, such as the popular 194 type bulb # A194B that can...
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  • Parts Needed to Connect Vehicle with 4-Pole to Trailer with 6-Way and Separate Brake Lights
    Since your vehicle's 4-pole wiring harness uses stop and turn signals that are combined on one wire, the green and yellow wires, you will use Vehicle to Vehicle Tail Light Converter # 118158 which takes in those combined signals and separates them out onto individual wires at its output side. Your Brown running light wire will simple bypass the converter and go directly to the trailer connector. Rather than use adapters to connect the tow vehicle and trailer I suggest you wire in a matching...
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  • RV Brake and Towed Vehicle Brakes Both Applied via Diodes
    I spoke with my contact at TowReady and he said the brake lights will come on normally when both the brake pedal on the RV and towed vehicle via a Brake Buddy are applied. He said if either brake is pressed the brake lights will come on. When both brake pedals are pressed at the same time the brake lights will come on. He also said 2.1 amps per side is plenty to handle your CR-V's brake light. They should illuminate normally when both the RV and towed vehicle brake pedal are applied.
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  • How to Wire a Towed Vehicle With Seperate Turn and Brake Cicuits on Towing Vehicle
    If the vehicle you are towing with has separate stop and turn signals then it will need to be wired with a Modulite converter so that it can run the lights on the vehicle you are towing that does not have separate turn signals and stop lights. If the vehicle you are towing with is already setup to tow a trailer then the Modulite converter is most likely already installed. If you are towing with the 1994 Ford Ranger mentioned above then you will need to wire it with a 4-way connector...
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  • 7-Way to 5-Way Adapter for a Honda Pilot with 7-Way and Trailer with 5 Pin Connector
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    The best way to get a US trailer to work with a separate wiring system is to go ahead and just add amber turn signals to the trailer. That way you just need the 2 turn signal lights and the proper trailer side connector to match the one on the tow vehicle. Converter # 118158 would not be needed. I have linked the lights we have that can be used as turn signals. The other way would be to combine the circuits on the tow vehicle and install a 4-Way flat connector on it to match the trailer...
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  • Can LED Lights on Boat Trailer Guide Posts be Wired as Running Lights, Turn Signal and Brake Lights
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  • Vehicle to Vehicle # 18158 Taillight Converter for Separate Turn Signals on 2003 Jeep Wrangler
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  • Flat Towing Wiring for Suzuki Samurai with Separate Tail Lights
    Although there are two different methods of wiring a towed vehicle that uses separate turn signals, we recommend using the 6 diode kit part # 154-792-118158, which includes the converter you mentioned. I will link you to several of our flat towing FAQ articles, one of which will tell you exactly how to wire your Samurai. Refer to Option # 2 on the Diode Installation Instructions for a Dinghy with Separate Tail Light Wiring FAQ page. Keep in mind that in addition to a tow bar, base...
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  • Wiring A 2009 Honda Fit To Be Towed By A Fleetwood RV And A 2007 GMC Envoy
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  • How To Wire A Towed Vehicle When Both Vehicles Have Separate Stop And Turn Signals
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    view full answer...
  • Installing Side Mount Turn Light on Trailer with Combined Brake,Turn Signals
    To wire a trailer in the way you describe you will need to use a vehicle-to-vehicle taillight converter, part # 118158. The converter will be wired inline on the trailer wiring and will break out the turn and brake circuits. I attached a drawing that shows how I would go about wiring this converter on a simple 4 wire trailer. You would need to cap off the red wire on the output side of the converter and tie that wire up out of the way, since you will not need to run it to the back of...
    view full answer...
  • Does Converter Need to be Used to Match Truck Wiring to Trailer Wiring
    That all depends on if your trailer lights have the stop light circuit combined with the turn signals or not. If the stop light and turn signals are combined then you should be good to go but if they are separate you will need to install a converter like part # 118158 to separate the stop and turn signals and match your trailer.
    view full answer...
  • Trailer Wiring Converter Recommendation for Adding Third Brake Light to Trailer
    You have to use a taillight converter like the part # 118158 wired to your trailer's wiring so that you can seperate out the stop light from the turn signals. Once you do that the red wire of the box will have just the brake signal for you power the third brake light. It will not blink with the turn signals.
    view full answer...
  • Installing a Trailer Wiring Converter on 1998 Dump Truck
    You'll need to use a circuit tester like # 40376 and test each pin on your 7-way as its function is activated. The pin in the 3:00 position should light up when the right turn signal and when the brake pedal is activated. The pin in the 9:00 position should light up with the left turn signal and brake pedal. I'm guessing when you test, you're not going to get brake signal at those two pins which means that the signal you're getting is unconverted. To fix things, you'll need to install...
    view full answer...
  • Can Tow Ready Vehicle to Vehicle Tail Light Converter 118158 Power LED Lights
    Tow Ready Vehicle to Vehicle Tail Light Converter # 118158 will not work when fed input signals from a vehicle that has LED lights (because the wiring for such high-efficiency lights will not deliver enough power) but it can connect to LED lights on the output side. This converter will separate out the stop light signal from the combined stop/turn signals in standard trailer wiring. This converter will allow you to have separate left and right turn, stop and tail light signals to feed to...
    view full answer...
  • Adapter Needed to Power Taillights of Camper that Have Separate Turn Signals and Brake Circuits
    Since your tow vehicle uses combined trailer wiring you'll need to install a signal converter on the camper so that you can get the stop/turn circuits separated out like you need. For that you'd want the part # 118158 and you'd be set. You'd want to install this on the camper's wiring since it is the factor in the equation that uses a non-standard setup.
    view full answer...
  • Is Turn and Brake Circuits Separate on OEM Wiring for a 2018 Ram 1500
    The typical wiring scheme for pickups has the turn and brake signals on the same circuit as you can see from the attached diagram. Since this should be the case on your 2018 Ram 1500 you will need a converter like the Tow Ready # 118158 if your trailer has separate turn and brake circuits. You may want to try connecting your trailer to see if everything works properly before installing the converter. Most trailers have the turn and brake circuits combined so the converter may not actually...
    view full answer...
  • How to Add a Third Brake Light to a Trailer
    To add a third brake light to a trailer is pretty simple, but does require an adapter to convert the signal. Because trailer tail light systems combine the stop lamp and turn signals for each side onto a single circuit, you will need to use a vehicle-to-vehicle tail light converter, part # 118158 to split the brake light circuit back out. The white wire on the input side of the converter would ground to the trailer frame, the green input wire would tap into the right turn circuit...
    view full answer...
  • Installing Side Trailer Lights to Blink with Corresponding Turn Signal
    If you are wanting to install side marker lights on your motorcycle trailer that blink with the turn signal, it will need to be tapped into the turn signal/brake light wire for that side. However, just doing this will also allow the side light to come on with the brake lights. You do not want to attach it to the running light circuit, as this would back feed and force the lights to come on when they should not. Trailer have combined turn signals and brake lights and the running light...
    view full answer...
  • Wiring A Trailer So That Turn Signal And Brake Signal Are Separated
    You will want to find lights that match the lights you currently have on your trailer. If you have incandescent lights I recommend either staying with incandescent or swapping out all of the lights to LEDs. LED lights draw much less power, so you may want to go that route. I have attached a helpful article that explains how the trailer wiring is run. In order to separate the brake signal from the you will need part # 118158. This will take the signal from the vehicle that has the turn...
    view full answer...
  • How to Wire Up a Trailer with Separate Taillights to a 4-Way
    You are going to need two thing, a taillight converter like part # 118158 and a trailer side 4-way like part # W787264. You will need to cut the connector off of the trailer and then wire the # 118158 to the trailer wiring like the diagram I attached to the right shows and then wire the # W787264 to the wires on the input side of the converter.
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Expert Research:
Rachael H
Expert Research:
Jeffrey L
Video Edited:
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Updated by:
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Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
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Installed by:
Cole B

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