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Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector

Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector

Item # 119178
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119178 - 0 - 5 Feet Long Tekonsha Trailer Connectors
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Adapts import and domestic vehicles with separate turn and stop lights (3-Wire System) to standard trailer tail light wiring (2-Wire System). Lowest Prices for the best trailer wiring from Tekonsha. Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector part number 119178 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (32)
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Tekonsha Trailer Wiring - 119178

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug and Lead
  • 0 - 5 Feet Long
  • Tekonsha

Adapts import and domestic vehicles with separate turn and stop lights (3-Wire System) to standard trailer tail light wiring (2-Wire System).


  • Short circuit protection safeguards itself and the tow vehicle against harmful electrical shorts and mis-wire situations
  • Circuit automatically resets once the module cools
  • Adapts a 3-wire system on the towing vehicle to work with a 2-wire system on the trailer
  • Works with most multiplex wiring systems


  • Wire pigtail measures 18" long
  • 4-Pole trailer connector is 60" long from converter box

In a three wire system, a separate wire is used to carry each of the stop, turn, and running light functions to the tail light assembly. On most trailers, the stop and turn signal functions are sent through the same wire.

Warning: Overloading circuits can cause fires. Do not exceed:

  • Maximum stop/turn light: 2.1 amps per circuit
  • Maximum tail lights: 7.5 amps

Read vehicle's owners manual and instruction sheet for additional information.

119178 Circuit Protected Taillight Converter with 4-Flat End

Replaces 119175

Installation Details 119178 Installation instructions

California residents: click here

Customer Reviews

Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector - 119178

Average Customer Rating:  4.9 out of 5 stars   (32 Customer Reviews)

Adapts import and domestic vehicles with separate turn and stop lights (3-Wire System) to standard trailer tail light wiring (2-Wire System).


I installed this a year ago on a semi for electric brakes on a trailer. It was easy to install from the directions given by you guys and has worked great. Thanks!


Easy to install and no separate power required. Some of the other taillight converters require a dedicated 12V power source, which means routing power from the battery...not this unit! The unit is easy to install, but it doesn't come with the quick splice connectors, so order those as well if you don't want to solder and heat shrink. I installed this on a 2006 WRX which required partially removing some trunk carpet and 1 piece of trim (4 carpet fasteners and 2 plastic nuts). The demo video on for the 2007 WRX correctly identifies the wire colours (I checked). I have a 3rd brake light on my trailer, so I ran an additional brake light wire to the 5 pole plug I installed in place of the flat 4 connector that comes with this kit. If you aren't worried about scuffing the bumper with the wire hanging out the trunk, the flat 4 will work fine. I drilled a hole in the back panel of the trunk and routed the wires through a grommet and down to a PK11502 Pollak 5 pole socket plug.


Looks good, I will be putting on soon, anxious to get product and use


Went though multiple adapters from different manufactures for 2000 Toyota tundra in less than a year, installed this unit and it's still working, it is a little more involved but able to locate the main body where road spray won't kill it.

Still working in Minnesota.
Jim - 10/03/2019


Bill E. was extremely helpful answering my questions and ordering a replacement part that was no longer available from Valley after a wiring converter failed.
Have not had time to install new part but expect no problems.
Received order promptly as well.

Worked great, just what I needed. Very happy with no problems.
Robert P - 02/26/2018


Got the 5 to 4 wire converter for my 2015 Goldwing aand installed it recently. Excellent product with well marked wires. Unit was well sealed from the weather and is working great! Fast shipping too!

Highly recommend

Still working perfectly!
Donald A - 05/31/2020


It took me a lot of time trying to figure out what I needed to adapt a 6 Pin round to a 4 Pin flat on a 2008 Winnebago View with always on daytime running lights. Brake lights wouldn't illuminate, turn signals worked fine, and DRLs were always on the towed vehicle as well as the View. Normal plug-in adapters won't work and there was no way without an expensive Dealer reprogramming to disable the DRLs.
This baby did the trick, once the brake controller wire was identified it was a simple matter of splicing.


This unit worked well with my 2013 Volkswagen Jetta Sportwagen TDI. The only thing I had to do to make it work better was to run two relays, one for the running lights and one for the brake lights.

Other than that issue, It's an easy to install and easy to wire type of deal.
Still functioning perfectly a whole year later!


the Tekonsha trailer light module solved the problem of no stop light power to the trailer I was working on. Amy was very helpful and pleasant to work with. I tell everyone if you need anything for trailers just call E Trailer. Joe


Great kit to add to any carI found the instruction easy to understand and I event watched the install video on the site. I am a pretty good elecrical guy so it was no problem for me, but you are going to need to know how to test probe the tailight plugs to find out what wires to connect to. I would suggest not using scotch locks to connect to the wires. Soldiering is the only way to make sure you arent damaging the wires. Good wiring option in a small package.


Thank you so much for your promptness and complete answer to my initial inquiry and providing a product that worked. The one my mechanic had installed did not work.


Product was just fine but etrailer takes service and training to the next level. Great how-to videos, schematics and diagrams make it very clear on how to install. Thanks!


The staff at had my order filled and at my doorstep in 3 days. Amazing service and one stop shopping for high quality parts. I added them to my favorites list.


This converter was exactly what I needed for my Honda trike and I received it in just 2 or 3 days very pleased


We ordered lights and an electrical hookup for a 1965 Starcraft Tent Trailer! It came correct and very quick. like four days! Easy and fast!


I installed this on a 2008 Honda Goldwing. It was an easy install and works as advertised. Great service from e-trailer.


Just what was needed. Excellent quality. Did not expect the electronics to be sealed as well.


works great


Easy install (though haven't gotten the trailer to give it a try yet). Seems to be of good quality.


Ordered and delivered in less than 24 hours with free shipping!

Thanks Etrailer.

Gary G


Excellent product, first class service as is the norm from etrailer.


The product worked exactly as described for my
2003 Dodge 2500. No complaints


Everything worked as expected. 1 year in and no issues. Great product.


Works as it is supposed to and stores out of the elements.


Good product, best price, prompt shippi ng.

Show More Reviews

Ask the Experts about this Tekonsha Trailer Wiring

  • Tow Ready Trailer Wiring Harness Recommendation for a 2004 Volkswagen Jetta
    The trailer wiring harness part # 119178 that you referenced is a confirmed fit for your 2004 Volkswagen Jetta but you would actually want the part # 119178KIT instead as it comes with a circuit tester and some quick splices to make the needed connections. If you happen to already have those parts then all you would need is the # 119178.
    view full answer...
  • Install Instructions for Upgraded Circuit Protected Tail Light Converter Hardwire Kit
    The install instructions for the Upgraded Circuit Protected Tail Light Converter Hardwire Kit part # 119178KIT or part # 119178 are attached to this page for you. The instructions are the same for both models, the former simply comes with a circuit tester and connectors.
    view full answer...
  • Wiring Harness Compatibility With 2003 Honda Civic
    The Tekonsha Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector # 119178 does not require a power wire. It captures the functions without needing direct power to the module from the battery. The module has an integrated short circuit protection to prevent overload. This harness is a confirmed fit for both the Coupe and the Hatchback model.
    view full answer...
  • Wiring Kit Recommendation for a 2012 Toyota Yaris Liftback
    I checked with Tow Ready and the Tow Ready Custom Fit Vehicle Wiring # 119178KIT that you referenced will work on your 2012 Toyota Yaris with a liftback. I attached installation instructions for this wiring kit for you to check out also.
    view full answer...
  • How To Wire a Trailer Harness on a 2000 Mitsubishi Montero
    Installation for a 2000 and a 2003 Mitsubishi Montero should be about the same. Part # 119130 will work, but part # 119178 is circuit protected and will protect your vehicle electrical system. You could also use part # 119178KIT which will have all the connectors needed to splice into wires and a circuit tester to make sure you have the right wires. If your vehicle has aftermarket LED tail lights, you must use part # 119130. Use the video for the 2003 Montero as a guide. The installation...
    view full answer...
  • What is the Correct Wiring Harness for a 2006 VW Jetta
    For your 2006 VW Jetta, you will actually need Tow Ready Wiring, # 119178KIT. This kit is for the 4 door sedan model. The kit comes with everything you will need to install it on your vehicle. Your 2006 VW Jetta has a multiplex wiring system. To wire your vehicle you will need to take the following steps: Note: You may need to test the wires using a Circuit Tester like # 3808. 1) Start by opening the trunk to locate the carpeted access covers to the tail light plugs on each side. 2) Locate...
    view full answer...
  • 4-Pole Wiring Harness for 2002 Damon DayBreak
    For a 4-pole flat wiring harness for your 2002 Damon DayBreak built on a Chevrolet Workhorse chassis, you can use Tow Ready Kit # 119178KIT. This kit includes the powered converter, a circuit tester to help you identify the wires for connection and the quick-splice fasteners. This harness will combine the separate stop and turn functions on the 4-pole output side. These combined signals will be carried on the green and yellow wires, right and left respectively.
    view full answer...
  • Taillight Converter for Motorcycle Towing Trailer with Combined 4-Pole Wiring
    Since trailer lighting is typically configured with stop and turn signals carried on the same wire, you will need to install a taillight converter on the motorcycle to combine those signals before they reach the trailer lights. You can use kit # 119178KIT which includes a circuit tester, quick-splice connectors and the converter itself with a 4-pole plug. The wiring configuration will be as follows: Cycle LEFT turn goes to yellow wire Cycle RIGHT turn goes to green wire Cycle BRAKE goes...
    view full answer...
  • Recommended Trailer Wiring Harness for 2004 Audi A6
    For your 2004 Audi A6, I recommend the Tekonsha Upgraded Circuit Protected Tail Light Converter Hardwire Kit with 4-Pole Connector (Includes Tester) # 119178KIT. This wiring harness will convert your trailer lights to function correctly with the running light wire (brown) and the brake/turn signal (green for right/yellow for left) and of course your ground wire (white). I've attached an article to assist in routing that 12V power wire.
    view full answer...
  • Parts Needed to Install 7-Way on 2008 Volvo VNL 670 for Towing Fifth Wheel Trailer
    Your fifth wheel trailer is going to have a 7-way blade style trailer wiring connector, so while the part # 119178 is the correct harness to start with you'd need to convert it to a 7-way with the adapter part # 37185. This will allow you to convert the taillight signals to a 7-way which will be easily controlled by the 2008 Volvo VNL 670.
    view full answer...
  • Trailer Wiring Recommendation for 1989 Geo Tracker
    For trailer wiring for your 1989 Geo Tracker we have universal kits like the part # 119178KIT which are a confirmed fit. This brand is the most reliable of the options available for your vehicle though.
    view full answer...
  • Where Does Red Wire of Trailer Wiring Kit # 119178KIT Wire to on Vehicle
    When installing the trailer wiring harness part # 119178KIT that you have the red wire gets ran to the stoplight circuit. If your vehicle has taillights that only come on with the brakes (and not with the blinkers), that is the circuit this should run to. Another place you can find this circuit is the third brake light of the vehicle.
    view full answer...
  • Installing the Tekonsha Kit # 119178KIT on a 2007 Audi A6
    To install the Upgraded Circuit Protected Tail Light Converter Hardwire Kit # 119178KIT correctly to your 2007 Audi A6 you will simply need to use the included circuit tester to see which light functions you need to splice into. Since vehicle manufacturers are not always consistent with their wiring and since there is no standard for color wires to use this is the best method for installation. You will want to connect the following wires from the kit to the following functions on your...
    view full answer...
    Image 1 for
  • Recommended Trailer Wiring Harness for 2008 Toyota Yaris Hatchback
    I do have a solution for you, however there is not a wiring harness currently available for your 2008 Toyota Yaris that will plug in without splicing into the vehicle wiring. I recommend the Tekonsha Upgraded Circuit Protected Tail Light Converter Hardwire Kit # 119178KIT. This kit will include everything you need to install a 4-Way connector on the vehicle that will power a trailer's signal lights. A circuit tester is even included to assist with locating the correct wires to splice...
    view full answer...
  • Trailer Wiring Harness for a 2006 Kia Sportage 4 Cylinder
    The 4 cylinder models of the 2006 Kia Sportage require a hardwire trailer wiring harness. There are a few options available, see link, but I recommend Tow Ready harness # 119178KIT. This is a non-powered converter so you will not have to make a connection to the vehicle battery. With this harness you would use the included circuit tester to verify the functions of the tail light wires on your Sportage. The harness uses the white wire for ground, red for brake lights, brown for running...
    view full answer...
  • Troubleshooting Brake Controller Installed in a 2000 Chevy Silverado that Doesn't Show a Connection
    Most likely the problem you described is a dirty trailer connector. Almost every time we see this problem it is corrosion on the trailer connector. However, since your tow vehicle is a 2000 Chevy Silverado there could be a couple connections under the hood of the vehicle that need to be made so that the controller will be fully functional. Check out the help article I attached that covers these connections.
    view full answer...
  • Recommended Trailer Wiring Harness For 2001 Toyota Corolla
    We do have a wiring harness that is designed to work with your 2001 Corolla, but it is not a plug and play harness. You will need to hardwire the harness, but it is really not very difficult. The harness is part # 119178KIT. You just need to access the vehicle wiring on the left side of the vehicle in the rear cargo area by the left tail light. The included tester can be used to find the wires you need to splice into with the included connectors. You can have someone sit in the front seat...
    view full answer...
  • Trailer Wiring Recommendation for a 4 Cylinder 2009 Kia Sportage
    The Tow Ready trailer wiring kit part # 119178KIT has been confirmed as a fit for your 2009 Kia Sportage 4 cylinder. But this is a universal fit style of harness that requires you to test the functions of the vehicle's wiring so that you can correctly attach the wires of the # 119178KIT. You will need to remove the rear taillight assembly to locate the wiring so that you can test it. I attached a link to a review video for this kit plus install instructions for you to check out.
    view full answer...
  • Trailer Wiring Harness Recommendation For 2016 Toyota Tacoma
    There is not a plug and play wiring harness available for your 2016 Tacoma. We do have wiring harnesses that would be hardwired for installation. I recommend the TowReady Wiring Harness, part # 119178KIT. This harness will work with either LED or incandescent bulbs and includes a circuit tester to make it easier to identify the wiring functions during installation. I have attached a link to an installation video of this wiring harness on a 2016 Tacoma you can check out.
    view full answer...
  • Trailer Wiring Recommendation for a 2001 Toyota Corolla
    Yes, the Tow Ready Custom Fit Vehicle Wiring # 119178KIT that you referenced is recommended for your 2001 Toyota Corolla. I wish I had specific installation instructions that would apply to your 2001 Toyota Corolla, but we have not had a chance to install this product in a Corolla like yours yet. Basically you will need to access your tail light wiring, test for function with the included circuit tester and then wire up the unit according to the installation instructions that I attached...
    view full answer...
  • How to Install Tow Ready Custom Fit Taillight Converter # 119178KIT in 2011 Hyundai Accent Hatchback
    The Tow Ready Custom Fit Taillight Converter # 119178KIT installs in your 2011 Hyundai Accent Hatchback by connecting to the wiring at the tail light assemblies. This harness works with both LED and incandescent lights and has an auto-reset feature. The kit includes the harness with 4-pole connector, a circuit tester to confirm the function carried on each vehicle wire, and quick-splice connectors. I have attached the written installation instructions as well as a sample video showing...
    view full answer...
  • Vehicle Wires are Thinner than the Wires of the Circuit Protected Taillight Converter
    It is not uncommon for the wires on your vehicle to be a little bit thinner than the wires of the Circuit Protected Taillight Converter with 4-Pole End, part # 119178. As long as you are tapping into the correct turn signals and brake and running lights, you should not have any problems. The circuit protected converter will protect your vehicles sensitive wiring and circuitry.
    view full answer...
  • Wiring a 2002 Volkswagen New Beetle
    The best way to find the correct wiring to attach the converter is to use a circuit tester to determine which wire serves which function. The best spot to access the wiring is behind the taillight assemblies. According to the information I have, the 2002 Beetle uses a separate wire for the brake and turn signals.
    view full answer...
  • Installing a Wiring Harness for Trailer Lighting on a 1996 Subaru Sidekick
    You will need to use a Circuit Protected Taillight Converter, part # 119178KIT, and hard wire it into the existing vehicle wiring. The procedure for installing the converter is pretty simple. Simply access the wiring behind the taillight assemblies, and using the included circuit tester, locate the correct circuits to tap into. You will see 5 blunt cut wires on the wiring harness. The functions of the wires on the wiring harness are listed below. Brown - Tail Lights Yellow - Left Turn...
    view full answer...

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Info for this part was:

Employee Joe V
Installed by:
Joe V
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Joshua S
Video Edited:
Joshua S
Employee Adele M
Updated by:
Adele M
Employee Wilson B
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Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Noah M
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Employee Shane T
Test Fit:
Shane T
Employee Chris R
Video by:
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