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Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit

Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit

Item # 119190KIT
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Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit Vehicle End Connector 119190KIT
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The best technical support and full trailer wiring installation instructions. Lowest price X3 trailer wiring guarantee and expert service. BMW X3, 2008 trailer wiring by Tekonsha are available from For expert service call 1-833-496-1390 to order your Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit part number 119190KIT, or order online at
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Tekonsha Trailer Wiring - 119190KIT

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug and Lead
  • Tekonsha

This ModuLite harness offers peace of mind by including circuit protection to safeguard itself and the tow vehicle from harmful electrical shorts and mis-wire situations. The upgrade also includes the ability to work with PWM on vehicles.


  • Short circuit protection safeguards itself and the tow vehicle against harmful electrical shorts and mis-wire situations
    • Automatically self-resets
  • Virtually eliminates draw on the vehicle's tail light circuit
  • Tail light circuit has been upgraded to work with vehicles using Pulse Width Modulation (PWM), allowing converter to fully turn on, giving trailer lights full brightness during activation
  • Powers the trailer's stop, turn, tail and running lights directly from the tow vehicle's battery
  • Unit prevents feedback from trailer to vehicle system
  • May be used on 2- and 3-wire systems
    • When used on 2-wire systems, brake wire on harness must be grounded
    • Adapts a 3-wire system on the towing vehicle to work with a 2-wire system on the trailer
  • Will work on vehicles and trailers with either LED, incandescent, or standard bulb tail lights
  • Works with most multiplex wiring systems
  • Install kit (118151) is included to help run wire to vehicle battery

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

  • Maximum stop/turn light: 4.2 amps per circuit
  • Maximum tail lights: 7.5 amps

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

119190KIT Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit

Installation Details 119190KIT Installation instructions

Customer Reviews

Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit - 119190KIT

Average Customer Rating:  4.7 out of 5 stars   (392 Customer Reviews)

This ModuLite harness offers peace of mind by including circuit protection to safeguard itself and the tow vehicle from harmful electrical shorts and mis-wire situations. The upgrade also includes the ability to work with PWM on vehicles.


There is no where at attach the wire harness it just dangles

The protective cover on the trailer connector can be attached to the safety loop as shown in the thumbnail photos above. This will keep the connector secure until its needed.
-- Etrailer Expert Mike L - 09/15/2022


Everything you need to perform the wiring installation like a pro. I also purchased the circuit tester which I highly recommend. Brophy Circuit Tester for 4-Pole Flat Trailer Connector item #F4CT


The product works great. The worst thing about it was that there were no instructions with it at all. I had to email etrailer and they in turn emailed me the instructions. Other that that no problems. Fast shipping and product is as advertised.

I used this product on my Victory Vision so that I could pull my trailer. Below is a picture of where I placed it. It worked out best in my opinion to velcro it to the back of the saddle bag. It actually mounted right under the wiring harness of the bike that I had to tie into.

Still works great. No problems at all.
Damon C - 12/18/2014


This is a great wiring harness. It took me a bit of time to sort out the correct wiring on my 2013 Tesla Model S, though, as the instructional video on ETrailer's site was specific to a different model year that had different wiring in the taillight harnesses.


thanks for being so helpful in switching us into this heavy duty wiring harness. The service was better than all face to face places in this type of business. My installer swapped out the modules and everything worked perfectly. I can't say enough about both customer service and the tech support that we received. There should really be a sixth star (for above and beyond)!

Works great... thanks.
Doug L - 01/16/2018


Great product: installed on my 2013 Mini Cooper Hardtop quite easily. I had called Trailercraft to install & was told there wasn't a hitch made for my Mini, & if there was one they would charge $1,000 to install it. DYI video was easy to follow.


A module such as this is absolutely essential when trying to add a trailer lighting circuit to a modern CANbus equipped vehicle. The module itself works beautifully but I deviated from the eTrailer install video for my '13 Jetta Wagon.

First, I used the 'poke-n-wrap' method with solder to attach the module's signaling wires to the vehicle wiring harness. I have a personal aversion to Scotchlok or vamp connections because they often fail with time and vibration. This method keeps the harness relatively compact and clean looking, especially if you resecure everything with cloth wiring harness tape.

Second, no self drilling screws. I attached the module to the chassis with proper self adhesive tape like 3M VHB. The white ground wire is easily attached to the existing grounding lug on the left rear wheel well, so no self drilling screw there either. Don't poke holes in your chassis with self drilling screws if you can avoid it.

I avoided drilling a hole in the spare tire well by running the power wire through the existing body plug in the area aft of the right rear wheel well. It's easy to remove the plug, drill a hole in it, and thread the wire through. Add a dab of black RTV to make sure it's watertight.

When powering the module, the suggested method is to split the 1/4" ring terminal and stuff it under the nut that holds the positive battery terminal in place. Instead, I obtained an M6x1.25 nut and secured the fuse holder to a unused, unfused stud on the terminal block inside the underhood fuse block. When it's time to change the car's battery, the split ring will inevitably get deformed and may cause problems. This way, the positive terminal clamp only has to do one thing: hold onto the positive terminal.

To bring the wiring harness outside the wagon I went a little off the deep end with a little sheet metal work and Molex MX150 connectors to make the passthrough watertight. I added etrailer 18140 and 18144 to mount the 4-way connector to the hitch so I wouldn't have to fish the wire out of the left-side trunk compartment and shut the tailgate on it every time I wanted to tow.


Install on 2018 Mercedes Benz CLA250 w/LED tail lights:

There were no guides I could find so I'm posting this for other etrailer customers.
These are my installation notes and the kit operates correctly. There are other ways to do this, I'm sure.

It isn't necessary to remove the tail lights, there is a removable piece in the trunk carpet. I removed that and the plastic trim panel in the middle.

The tail lights have 10-pin connectors. On the left there are 8 wires on the right there are 7. My thought is maybe this has something to do with the european style parking lights. After probing I found this:

Left Side:
Turn/Brake - Yellow with White stripe
Running/headlights - Black with Orange stripe
There is constant power to the Green with White stripe

Right Side:
Turn/Brake - Light Blue with Red
There is constant power to the Green with White stripe

I had to splice additional wire to mount the module where I wanted it. The final connections were:
Module Brown to Left Black/Orange
Module Yellow to Left Yellow/White
Module Green to Right Light Blue/Red
Module White to Ground
Module Black to Battery
Module Red Terminated (unused)

The positive electrical connection I made was under the hood, off the fuse box. Terminated to one of the lugs, covered with wire loom, and run into one of the cars wire bunches.

The 4-wire hitch output is terminated with a CURT tester (If you put one there, you'll always know where it is when you need to troubleshoot something)

This vehicle is completely covered on the bottom and running the wire can be very time consuming if you want it to look tidy.


I am pleased with my experience with ordering and installing this wiring kit. Prompt delivery, good updates on shipment progress, quality product, great instructions. Where the individual vehicle owner is either familiar with basic electrical installations or willing to learn, I feel the installation is not difficult.


Thank you E-trailer for my heavy duty Modulite wiring harness with installation kit. Looking forward to using this high quality product.


This kit was great and functions exactly as intended. With the help of the online video it was easy to install, even for people without any electrical knowledge.

My only advice is:
1) watch the video and the hitch installation video at the same time. This will help you plan ahead and not re-install parts during the hitch installation, that will need to be removed for the harness installation
2) be VERY careful about selecting the right wires, by using the testing tool eTrailer provides. In the install video for my BMW X5, the technician referenced a yellow and black wire when making the initial connection. He later goes on to make a separate connection for a black and yellow wire. To the novice they look nearly identical. I confused the two wires and had to re-do this, but would not have been an issue if I had understood the distinction and used the testing tool, as recommended in the instructions
3) be careful about placing all connectors so that they face in the same direction. Does not impact function, but makes for a neater install when complete.

I could not be happier about how this project turned out, and credit etrailer with all of the success. It has a very OEM look, and etrailer made the entire project doable for me through their great suite of videos and excellent Customer service. I wish every retailer could be this good!


The kit was fine. It was missing a couple of ring connectors and test light will require some additional wire to use it. The video on your site was very helpful. One more suggestion would be to use electrical tape instead of the zip ties where the wiring must be routed next to the hatch hinge. if there is tension the zip ties might break, but the tape will flex a bit.

I will have our customer service team reach out to you.
-- Etrailer Expert Jenny N - 01/17/2022


Perfect ! First time I install a hitch and this kind of electric Harness. I was a little confuse on what to do first but well explain and it went very well.
Tips : On my Tesla model 3 2020 there was a 12v plug already coming directly from the 12v battery in front, so it was a lot easier then passing this cable my self. The cable is in the bumper, you should see it if you install the hitch :-)
I own a company and I work with computer, so nothing to do with mechanics and electronics. Just study the plan, watch videos online. Once you understand exactly how it works, it's pretty easy to install.


The link for the You Tube video was something I found. It would have been better to have a link sent with the order for the vehicle model and year specified. I was ready to send it back,, but then I found the video by doing a Google search.

The splice connectors are very finicky. One must be sure to have the small wire positioned very carefully so that the clip catches it and does not push it to the outside of the clip.


It took some time and trouble to figure out how this correlates to the installation video (for the Curt model, which has fewer wires). Once the right wires were identified, it was very simple and straightforward. The system works like a charm, and I've already towed a U-Haul trailer. Depending on the vehicle, I would recommend getting some 3/8" wire loom ($1.99 @ Home Depot) to protect the power wire from abrasion/cuts if you route it along your car's underbody. The included instructions (online & paper) are too generic to be useful, and the vehicle wiring codes (types of wire systems: 2-wire, 3-wire pulse, etc.) don't have a reference on the TowReady website. Moderate gripes, but some streamlining would've saved me unnecessary troubleshooting. All the parts you need are included, with extras just in case.

Hey Jameel, not sure if things were different back in 2012 but for folks ready your review today, I suggestion 1/4 wire loom instead. The 3/8 diameter is larger than needed and leaves more play.
-- comment by: Richard - 06/02/2014


Worked out great on my Volkswagen, installed easily and I've had no issues with it.


Would have been 5 stars if it had included a schematic of color coded vehicle wiring.


An easy all parts included kit. Video instructions make this a no brained. If it doesn’t work check your connections. User error is the only problem you will have.


I installed my unit on a 2013 Audi a4 quattro sedan. using the provided tester I determined it is a two wire system. i installed unit in driver side outside of trunk. I easily snaked the green wire through trunk to passenger side chamber. The battery is in the trunk, so it was easy to connect supplied fuse connector directly to battery. Wiring:
Unit green wire to gray/blue wire on passenger side
Unit Yellow wire to gray/white wire on drivers side
Unit Brown to Green wire on drivers side. No drilling needed
Ran trailer wire into trunk and out through cut out on trim where hitch is
Works perfectly.
Reason for not a 5: No directions and missing 1 crimp connector.

Thanks for your business and your detailed review regarding the wiring, Frank. Depending upon the factory product run, the vehicle wiring colors may change. We always recommend testing for function before connecting the wires.
-- Etrailer Expert Laura E - 03/15/2017


Fast delivery, products received in perfect condition. Fits like a glove and very helpful installation videos available. Only issue, 1 power wire connector missing in the kit, not a big deal.

I will have our customer service team reach out to you.
-- Etrailer Expert Jenny N - 02/20/2022


I ordered a hitch and a modulite controller. Upon arrival the box was mangled and only the hitch was inside, I reached out on a holiday and they were prompt to respond and send me a new one. I haven't installed it yet but as a company review worth the 5 stars. I'll try and revise review once installed and has been on for a while.


Great products, service and prices. I would deal with them again and recommend them to anyone. I only bought from them this one time, but it went well.


The kit is of great quality but the 5 stars are backed up by OUTSTANDING customer service. When you call you actually speak to a real person you can understand. EXTREMELY rare these days. They know what they are talking about and get you the parts you need very fast. They don't hold them 2 or 3 days then ship. They are are on it. One of the best companies I have ever experienced!!! Keep up the professional service!!


Everything seems to be high quality. The blue splicing connectors even come with dielectric grease in them to help keep the connections from corroding over time. The instructions are pretty good and etrailer’a videos really help with the install. My only complaint is it seemed to be missing a few small parts like the yellow butt connectors and the ring terminal was too small for my application. Besides that, it’s great


I have used before, and never disappointed. All parts received in New condition.

Show More Reviews

See what our Experts say about this Tekonsha Trailer Wiring

  • Recommendation for a Trailer Wiring Harness for a Victory Vision Motorcycle
    I would recommend using the Upgraded Modulite Circuit Protected Vehicle Wiring Harness with 4 Pole Trailer Connector, item # 119190KIT, which is the wiring harness that you mentioned. The 119190KIT includes the all of the wiring needed and a circuit tester to help determine the wires to splice into for the tail light functions. The # 119190 wiring harness is a powered harness that draws only about 5 milliamps from the vehicles tail light circuits and provides power to the towed trailer...
    view full answer...
  • Trailer Wiring Harness for 1999 Lexus RX300
    PWM stands for Pulse Width Modulation, which is a particular wiring system that some vehicles use. Instead of having a single wire for each different circuit, PWM will use the same wire for two or more circuits by using varying pulses for different functions. PWM is a fairly recent technology, your RX300 uses a more traditional wiring system. The # 119190 converter you mentioned would work well for you, but I recommend the # 119190KIT that includes the wiring kit that includes the wire...
    view full answer...
  • Can Power Wire for Trailer Wiring Harness be Connected to 12 Volt Outlet on 2013 Volkswagen Tiguan
    No. The issue is that wiring harnesses # 119190 or # 119190KIT are tested and rated for a connection to the battery only. Installing them using any other method could cause undesired operation. Also, if connected to a 12 volt outlet, you will lose that level of circuit protection between your 2013 Volkswagen Tiguan and the trailer. Routing the wire is just time-consuming but not really difficult. I have included a link to a help article with tips on routing the power wire for you.
    view full answer...
  • Installing Trailer Wiring Harness Part #119190 on a 2013 VW Tiguan
    Some vehicles combine stop and tail light functions onto 1 circuit and then also have an additional tail light function wire that is independent of the stop (such as your 2013 VW Tiguan). These vehicles will require that you attach the trailer light power module red “stop” wire to the same combined circuit on the vehicle and then attach the brown “tail light” circuit to the independent circuit on the vehicle.
    view full answer...
  • Installation Instructions for a Circuit Protected Convertor on a 2008 Mercedes R350
    The following link will take you to the installation instructions online.
    view full answer...
  • What Trailer Wiring Harness Should be Used for a 2004 BMW X3
    We offer the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit, part # 119190KIT for your 2004 BMW. The modulite features a taillight converter, and would draw the 12 volts to power your lights directly from the vehicle battery, instead of through the lighting circuits.
    view full answer...
  • Modulite Wiring Kit for a 2004 BMW X3
    You would use the Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, part # 119190KIT to wire your 2004 BMW X3 for towing.
    view full answer...
  • Installation Instructions for Wiring a 2008 Volkswagen Rabbit to Tow a Trailer
    Due to the MX (Multi-Plexed) wiring system on your 2008 Rabbit, you will need the Tow Ready Wiring Kit, # 119190KIT, to add trailer wiring to your vehicle. On the 2008 VW Rabbit, you will need to find the circuit that contains 12 volt brake and taillight functions and does not have the turn function on that wire. Attach the red stop wire from the # 119190KIT to this circuit. Ground the white wire and the brown wire from the # 119190KIT to a good ground location that is free of paint,...
    view full answer...
  • Heavy Duty Trailer Wiring Harness for a 2000 Toyota 4Runner
    We offer a Heavy Duty Modulite Wiring Harness, part # 119190KIT, that would draw the power from the vehicle battery and provide 15.9 amps of lighting capacity. You will be able to just splice the wires from this kit to the wires from the vehicle side of the existing converter.
    view full answer...
  • Diagram for Wiring the 2006 BMW X5 Trailer Wiring Harness
    Yes, the wiring diagram for wiring the 119190KIT wiring harness is in the instructions (see link). You will need to attach the wires from the converter on the harness by function only using the included circuit tester. Your 2006 BMW X5 has a 3 wire Multiplexed wiring system that requires a different wiring configuration. Your vehicle has a combined stop and tail light circuit and an additional tail light wire. You will attach the red stop light wire to the combined circuit and the brown...
    view full answer...
  • Wiring Instructions on Tow Ready Wiring Harness and Install Kit, # 119190, for 2010 VW GTI MKVI
    For the Tow Ready Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit, # 119190KIT, we do have a wiring installation instructions technical bulletin for your 2010 Volkswagen GTI. I will send you a link to this bulletin. We do not have any wiring diagrams for the 2010 Volkswagen GTI because the manufacture does change, quite often, the color connections on the wiring systems, so it is hard to maintain the correct diagrams. If you have any more questions...
    view full answer...
  • Instructions to Wire a 4-Way Trailer Connector on a 3 Wire System for a 2007 Volkswagen GTI
    The 2007 V-dub GTI has a 3 wire system and requires an upgraded, circuit protected modulite to protect the vehicles sensitive wiring. You would use Tow Ready Wiring, # 119190KIT. I have included a link to the instruction below, but there are some supplemental instructions you will need for your specific vehicle which I have included here and as a link below. Tail Light and Brake Functions: With a test light, probe the wires behind the vehicles taillight until you locate the wire that...
    view full answer...
  • Has the Tow Ready 119190KIT 4-Pole Trailer Wiring Kit had Problems with a 2004 Volvo XC90
    We have not yet heard of any problems or computer failures with this kit on a Volvo XC90. I called Tow Ready, the manufacturer, to see if they have heard of anything and he said everything has been pretty quiet with these kits and Volvo vehicles. We have a video that I have linked to below that walks through an install of this kit on a 2004 that should be pretty helpful to anyone installing this kit on a 2004 XC90.
    view full answer...
  • Is Tow Ready Modulite Hard Wire Kit 119176KIT Compatable with a 2011 BMW X5
    Yes, the # 119190KIT hardwire kit is the recommended application for your 2011 X5. This wiring kit is compatible with vehicles and trailers with LED lights, so it should work well for your application. The # 119190KIT hardwire kit is a universal fit hardwire kit, so I have linked the installation instructions below, and a video of an installation on a 20011 BMW X5 for your reference. To install the hardwire kit on your vehicle, you would use the included circuit tester to test the...
    view full answer...
  • Tips for Installing Upgraded Modulite Wiring Harness # 119190KIT on a 2010 Volkswagen Passat
    A lot of times, the biggest hurdle people run in to when wiring a 2010 Volkswagen Passat Wagon or similar vehicle with the # 119190KIT, is determining if they have a 2 or 3 wire system. Some Volkswagens use what is called a Pulse Width Modulation which requires the 119190KIT, and this can make finding the correct wires for installation difficult. After you have mounted the converter box and grounded the white wire, make sure you disconnect the negative battery terminal. Following the directions,...
    view full answer...
  • Installing Trailer Wiring Harness # 119190KIT, 2007 Volkswagen Golf MKV GTI with a 3 Wire System
    For a 2007 Volkswagen Golf GTI, I recommend using the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness with Install Kit, # 119190KIT. I have included a link to the installation details for reference. You will want to follow the installation steps for a 3 wire system. If your system has combined stop and tail light functions, what you will do is attach the red stop light wire to the corresponding stop light wire on the vehicle. The brown running light wire will need...
    view full answer...
  • Trailer Wiring Harness Installation on a 2010 Volkswagen Tiguan
    The Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, item # 119190KIT, is designed to be installed on the 2010 Volkswagen Tiguan without any assistance from the dealer, or reflashing the vehicle computer. None of the wiring harnesses we carry require dealer help with the installation. You will need to test the wiring on your Tiguan, with the included circuit tester, to determine the correct wires to attach each wire to on your vehicle, see instructions. The information...
    view full answer...
  • Routing the Power Wire for a Trailer Wiring Harness on a 2013 Honda Civic
    Routing the power wire to the vehicle battery can sometimes be the most difficult part of installing a powered wiring harness. While we have not had the chance to install a wiring harness on a 2013 Honda Civic, I may have some information that will help. Once you remove the rear threshold, or scuff plate, you may find a rubber grommet to the left of the spare tire on the inside wall that was covered by the rear threshold. To remove the rear threshold, you will want either a trim panel...
    view full answer...
  • Taillights Not Working on Trailer when Towed by a 2004 Volvo XC90
    It sounds like you might have a weak ground connection or corrosion in one of the bulbs on the taillight circuit on the trailer. Since you tested with a circuit tester and a different trailer is working properly the issue should be found on your trailer. The wiring kit, # 119190KIT, on your 2004 Volvo XC90 has a sophisticated signal converter that can detect weak grounds and corrosion that can cause bleed over on the trailer circuits and will cut off the power to that circuit. Plugging...
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  • Would the Tow Ready Wiring Harness # 119190KIT Fit a 2010 BMW X5
    The Tow Ready Custom Fit Vehicle Wiring # 119190KIT that you referenced would work well on your 2010 BMW X5 diesel. Check out the install video I attached for this product for you to check out also.
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  • Troubleshooting a Trailer with no Left Turn Signal/Brake or Running Lights
    I attached an FAQ article that has a trailer wiring diagram for you to check out. I strongly suspect that the problem is the ground on the left side taillight assembly since both functions on this side of the trailer are not working. Make sure it is grounding to a clean metal surface, some assemblies ground through the mounting hardware so you need to make sure the assembly is attached to a clean metal surface. I attached an FAQ that should help you troubleshoot further if needed.
    view full answer...
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  • Tow Ready 4-Pole Wiring Harness # 119190KIT Installation Video for 2014 Acura MDX
    The recommended wiring harness for your 2014 Acura MDX is the Tow Ready # 119190KIT. This kit includes a powered converter, connectors, fuse holder and a circuit tester, which is the best way to identify the functions carried on each of the vehicle wires. Although we do not have a video showing installation of this particular item in your particular vehicle, the overall process will be the same as that shown in the two linked videos. The process in general consists of locating and testing...
    view full answer...
  • Troubleshooting Shorted Out Powered Taillight Converter on 2007 BMW X5
    The converter is designed to provide circuit protection, to isolate any shorts from the vehicle wiring. In this instance, it served its purpose perfectly by blowing its internal circuit breaker before anything on the vehicle could be damaged. The circuit breaker shuts down before the short can reach the vehicle wiring, which explains why no fuses were blown. Before replacing the converter, I'd suggest you carefully examine the trailer wiring, looking for the short that caused the converter...
    view full answer...
  • Trailer Wiring Harness for a 2014 Volkswagen GTI 2.0 Turbo Gas
    For your 2014 Volkswagen GTI you can use trailer wiring harness # 119190KIT. This is a hardwire kit. A T-connector style is not available for your GTI.
    view full answer...

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