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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
Our Price: $36.23
You Save: 26%
Custom Fit Vehicle Wiring
Shipping Weight: 0.53 lbs
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Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector Converter 119178
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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). 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 119178 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (35)
  • Q & A (0)
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Tekonsha Custom Fit Vehicle Wiring - 119178

  • Universal Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Converter
  • Tekonsha
  • 1-1/2 Feet Long

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 Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (35 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).


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.

Robert P.


Worked great, just what I needed. Very happy with no problems.


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.


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

Donald P.


Still working perfectly!


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.


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.


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!


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!


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.


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!


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.


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


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


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


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

Thanks Etrailer.

Gary G


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.


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.


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


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


Good product, best price, prompt shippi ng.


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


Good product, a bugger to instVery pleased with the product. I ended up tearing my trunk apart to find all of the wires that I needed, but all's well that ends well. It will be very simple to use now.

Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle 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...
  • 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 Kit for 2003 Dodge Ram 2500 4x4
    Before you go to the effort of re-wiring your 2003 Ram 2500 tail lights you might want to check the trailer wiring, trailer plug and the vehicle trailer connector for signs of damage or wear that could be causing the issue with the trailer lights. A helpful article is linked for you to aid your troubleshooting. I did find record of your purchase of 4-pole wiring kit # 119190KIT. This heavy-duty harness connects to the Dodge taillights and delivers combined stop/turn lighting signals for...
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  • Recommended Trailer Wiring Harness for 2008 VW City Golf
    To install a 4-Way connector on your 2008 VW City Golf, I recommend the Tekonsha Hardwire Kit # 119178KIT. This harness does include the needed circuit protected tail light converter that will adapt the 3-Wire system on your vehicle to the standard trailer tail light 2-Wire system. This kit also includes a circuit tester that will aid in locating the correct wires to connect to on your City Golf. I have attached the written installation instructions that you can take a look at.
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  • 4-Way Flat Wiring Harness For a 2000 VW Beetle Turbo
    Yes, the Upgraded Circuit Protected Tail Light Converter Hardwire Kit # 119178KIT is the kit you will need for your 2000 Volkswagen Beetle Turbo. This will allow you to connect to the 4-way flat connector you already have on your trailer.
    view full answer...
  • Trailer Wiring Harness Recommendation for 1991 Acura Integra Hatchback
    The correct trailer wiring harness for your 1991 Acura Integra Hatchback, is the Upgraded Circuit Protected Tail Light Converter Hardwire Kit w/ 4-Pole Connector and Circuit Tester # 119178KIT. This harness adds a 4-way trailer connector on your Acura Integra. The harness splices into your existing wiring. The surface mount technology construction ensures superior performance. I attached installation instructions and a video to assist.
    view full answer...
  • How To Install Draw-Tite Wiring Harness # 119178KIT to 1997 Volkswagen Jetta
    I do not have a wiring color reference for your 1997 Volkswagen Jetta, but if you are using the Tow-Ready Wiring Harness, part # 119178KIT, I can tell you how to connect the harness. Vehicle specific installation instructions are not available due to the fact that this harness fits many vehicles. But there are general instructions which I will outline below. I am also including a link to the installation instructions of the wiring harness. There are 5 wires that will need to be wired to...
    view full answer...
  • Tips for Installing Trailer Wiring Harness 119178 On a 2000 Toyota Corolla
    Since trailer wiring harness # 119178KIT is a universal fit type of item it does not have vehicle specific instructions. So the instructions are basically the same for all vehicles. You will use the included tester to test the tail light wiring on the vehicle then make the necessary connections. White is ground and connects to a bare metal surface. Red is brake lights only, yellow is left turn signal only, and brown is running lights only. These are all on the driver's side. The green...
    view full answer...
  • Recommended Solution to Add Trailer Wiring to Ambulance with 3 Wire Lighting
    I have a solution for you, but there is not a T-One style connector for this, so you'll need to hard wire the trailering wiring in. With that said you can use the Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector # 119178 which will convert a 3 wire system on the tow vehicle to a 2 wire for towing a trailer. We've even got a video of this being installed on a Ford chassis ambulance that you can use as a guide for installation that I've linked to this answer.
    view full answer...
  • Turn Signal and Tail Light Circuits Work But Brake Light Circuit Not Working on RV Trailer Connector
    The 6-Way square plug on the RV most likely indicates that it uses separate circuits for the brake lights and turn signals. You will need a converter to combine the brake and turn signal circuits and then wire the output wires from the converter to the 4-Way flat. You could just use # 119178. On it the white wire is ground, red is input for brake lights only (probably that red or black wire you did not connect), green is right turn signal, yellow is left turn signal, and brown is running...
    view full answer...
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  • Wiring Harness Recommendation for 1990 Geo Tracker
    I have a trailer wiring harness that will work on your 1990 Geo Tracker, but we cannot guarantee the Tow Ready T-One Wiring Harness, # 118372, will fit your vehicle. This harness was designed to fit the 1996-1997 Geo Tracker. The wiring harness we recommend is the Tow Ready Universal Wiring Harness, # 119178KIT. To install this harness, you will have to gain access to your vehicles tail light wires and splice-in by function. Your tail light wires will not match the wires on the Tow Ready...
    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.
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  • How To Tow A Trailer With A 4-Way Using A Motorcycle With Separate Wiring
    Your 2008 Harley Davidson Heritage Softail Classic Anniversary uses a 5 flat because motorcycles have turn signals on different circuits/bulbs than the brake lights. Since your trailer has combined turn signals and brake lights on the same circuit, I recommend The Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector # 119178, which will combine the separate circuits on the bike to the output side of the connector.. This wiring harness adapts to your Harley...
    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...
  • 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 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...
  • Trailer Flasher Lights Do Not Work When Running Lights Are On
    It does sound like a classic ground issue you are having on the trailer since the flashers do not work when the running lights are on but work when they are off. The running lights have a bigger draw on the wiring and if the ground is not sufficient the other lights will not operate properly. I recommend to make sure all of the grounds on your vehicle trailer connector and your trailer are properly grounded to a clean bare metal surface. Running a ground jumper wire from each light to...
    view full answer...
  • Solution for Trailer Wiring Circuits Not Active on 2004 Dodge Ram
    On a 2004 Dodge Ram the trailer wiring circuits are protected by the TIPM of the vehicle which can only be reset by a Dodge dealer. Problem is that it can only be reset so many times and after that requires an expensive replacement. That's why we recommend bypassing it with a hardwired trailer wiring harness like part # 119178KIT. Which you can then wire to the 7-way of the truck.
    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...
  • 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...
  • What Gauge Wires is the # 119178 Tow Ready Circuit Protected Converter Constructed With
    The wire gauges on the Tow Ready Circuit Protected Converter, item # 119178, are 16 gauge.
    view full answer...

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