Upgraded Modulite Vehicle Wiring Harness Kit w/ 4-Pole Trailer Connector and Installation Kit

Everything needed for a clean install is provided. The only problem I had was the quick splice wire connectors. The 2015 Subaru WRX had very small diameter wiring for the tail and brake light wires and the wire connectors would not make contact. I spliced the wires manually and everything worked fine. 135872

It feels heavy duty and is working exactly as it should. Easy wiring in my 2005 Passat TDI. The most difficult part was bring the 12ga wire from the battery to the rear of the vehicle. The effort was worth it; I have a professional looking install that works perfectly. 78902

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The product works perfectly. A year later it still looks and works like a factory installed item.

Eric P - 05/03/2014

I just installed by my own on BMW 135i 2010 despite the fact few dealers and u-haul refused to help me. It is a way easier installation(45mins) as compared to other car brands, because the battery is at the back of the car. The only thing you would need from the kit is one more butt connector. I had a problem to find a place for ground - but it is solvable. I used crocodile connector and tape to connect to one of the screws of the back light. One more easy thing for dummies. To test the right wire you will need to connect one end of the tester to the ground of the car, switch on the light to test and connect the tester(which is also in the kit). For tail light you will need to switch on the car engine. If you do not want to test these here are the colors you use in your car Left side of the car in multibulb assembly wires: MODULITE ----------------------------------------------135i LEFT TURN -------------------------------------- Blue wire with green stripe BRAKES ----------------------------------------- Purple with Yellow stripe Left side of the car on Tail light bulb harness: TAIL LIGHTS ------------------------------------ Purple wire with Light Blue stripe Right side of the car in multibulb assembly: RIGHT TURN ------------------------------------- Blue wire with Brown stripe ^^^I took this description from open source of one of the BMW forums. For me it worked out well. As for the Modulite colors they are in the pdf Instructions of this Modulite. I do not know why I did not get this in a printout with modulite, but I got this info here http://www.etrailer.com/instructions.aspx?pn=119147KIT 148050

I recommend the Tow-Ready 119147KIT instead of the Curt Model for a 2013 Prius. I had to return the Curt Kit because the running lights/tail light stayed on all the time even with the vehicle off. Sometimes there wasn’t a tail/running light on if you reset the converter by removing and re-installing the fuse. This Tow-Ready model works like it should. You'll need 12 gauge wire to run from the battery, (right side hatch area,) to this unit which will need to be mounted on the driver’s side, rear hatch. At the very top of the left rear tail light are covered wires going into a plug. The Blue is the Stop light and the Brown is the tail/running light. (Be careful since these wires are thin solid copper wires.) Left turn signal is the green/yellow stripe wire and on the right side rear lamp the right turn signal is also the green/yellow stripe wire. You will need to remove the left rear panel to get to the blue and brown wires. Remove the bottom tray cover, the bottom tray as well as the left rear plastic tray and the plastic bottom hatch trim over the latch assembly. Remove the Phillips screw on the left rear panel as well as the chrome tie down clamp. This sounds harder than it really is. Good luck! 134002

Very very confusing and incomplete directions, NO way to understand the difference between the red "2 wire or 3 wire setup" Very very annoying, parts missing in, i.e. 12 gage wire, fuze for battery connection. I would NOT recommend anyone with a BMW 135i buy this product, I am very dissatisfied with this confusing and incomplete kit 85543

Hardwire kits like this take a little bit of extra work and require a basic understanding of some electrical basics. If anyone ever has questions, give us a call at 1-800-298-8924 and our techs can help out quite a bit with the project and get you up to speed on the background info you will need to complete the task. We also have some great videos on the subject.

-- Patrick B - 08/29/2013

Circuit Testing for Vehicle Wiring - Video

Testing for a Correct Ground Connection Demonstration - Video

Recently purchased this to go with a Hidden Hitch for a 2005 Honda Element. Everything was delivered on-time and in perfect condition. While the hitch went on smoothly, I had originally viewed the video for installing a kit on an Element but the kit in the video is not the same. The extra step for installing the power tap off the battery took some extra time. Not having a lift or a good way to really get a good look under the car to route the power line. I also added some conduit for the power line to protect it. The only thing that really didn't fit properly were the supplied ring terminals, I had to pick up a different size for the battery terminal. I also had to get some wire for the right turn signal since the right turn signal wire was not long enough to reach the right turn signal for the connection. 250377

The electrical kit took me about 3 hours to install, I liked that it included a test light with a sharp probe for finding the correct wires. I also like that it isolates the trailer power away from the car lights. This is not your auto part store $20 converter plug. This unit, takes the signals from the car's lights but draws the power from the battery so it does not overload the car's lights. This prevents things like the speed of the turn signal changing that can happen with cheap converters. I did not used the include wire clamps, rather I soldered the wires for better connection that will last for the life of the car. 323166

Got it wired up everything works great! Thank You 133872

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by: John M05/09/2019

worked like a charm, no issues 639936

Great company and service. 592437

Quick delivery. Reviews had been read prior to order and consistent with reviews, lack of provided instructions . Weather currently prevents installation so critique can only extend to positive assessment of components received. Color coding obvious and similar to previous hookups I have done. Reviews said etrailer tech helped which I may require for one variation from previous trailer wiring experiences as I add this to my Volvo C30. 590388

This particular wiring harness isnt a vehicle specific item, so the instructions will be pretty basic. To see the manufacturer-provided instructions, click the link Ive provided.

-- Mike L - 12/13/2018

Instructions for 119147KIT

by: Carlton12/11/2018

Product work as described. One of the wire connectors was problematic and I had to solder it instead. Also I purchased a mounting bracket from the trailer rental place for the 4 prong connect on the car end. This was to secure it to the car and it worked fine for awhile but now is loose and the connector keeps falling out of the bracket where it is to snap in. It's now wired tie to the mounting bracket. That connector should have a better design in the way it secures to any mounting bracket. Otherwise, I saved a lot of money installing your kit rather then having the rental place do the electrical work for my new hitch. 589921

Arrived as promised! 588011

Good product. I followed the etrailer video to install it in a Mercedes 2000 C280. I had to use the brown wire to connect it to the tail light. 584665

This kit is good, and very complete. It would benefit from some model specific instructions, like the trailer hitches come with. The average person with no automotive background CANNOT install this on a late model car. you need to know how to remove trim panels and components - which is easy with a little instruction! 572880

This particular wiring harness isnt a vehicle specific item, it fits many different vehicles so therefore itd be very difficult to provide vehicle specific instructions for the hundreds of vehicles that it can be used on. There are some installation videos linked above showing the harness being installed on a different vehicle. The actual step-by-step process shown in the videos would be different than the procedure for your particular vehicle, but the method used for testing that determines which taillight circuit controls which function would still be very helpful.

-- Mike L - 10/09/2018

by: Amy10/09/2018

everything is working as it should be. Great customer service. 572877

Everything went well, I am pleased with the results. 567727

by: Andrew09/05/2018

put it on truck , and just used it , average use twice a week 561961

by: Lloyd08/28/2018

2017 Mazda CX-9

Somewhat difficult to install. Had to call support line for help, they did solve my issues. Works great after it was installed. 558970

Would be nice to not have to cutn splice the wires when u need to wire thru holes. Also would be nice to have instructions on how to wire up. There were none with the order 541894

Too complicated and instructions not clear. I recommend a factory harness instead of the application. 541337

Because this wiring harness isnt a vehicle-specific item, the install instructions are indeed vague, as this product fits numerous vehicles. The basic procedure would involve using the included circuit tester to verify which wires in the vehicles tail light wiring harness control which lighting function. Once each function right turn, left turn, brake, and running lamps is identified, the corresponding wires on the trailer harness are spliced in. Yellow wire taps into the left turn circuit, green into the right turn, red into the brake lamp and brown into the running lamp circuit. The instructions cannot be any more specific as different vehicles use different wire colors to carry the different functions. Ive linked to an install video showing a similar harness being installed on a 2012 MB GLK Class. The wire colors on this vehicle might be different than whats found on yours, but the procedure for identifying which circuit carries which function would be the same.

-- Mike L - 07/14/2018

Trailer Wiring Harness Installation - 2012 Mercedes-Benz GLK-Class - Video

Installation instructions were well written. I missed on the T-One plug and play release for the Jeep Wrangler JLU by a week and recommend that over the universal kit due to the T-One being plug and play for the tail light connectors. Either way, great products. Thanks!! 502378

by: Jeff04/23/2018

2006 Toyota Sequoia

Installed on a 2006 Toyota Sequoia. After one year using the kit with a boat trailer in salt water, no problems noted. 499647

Did use it. Didn’t realize my truck was already wired for a trailer since a didn’t have a hitch receiver. But every was there as described in package. 487335

Product arrived exactly as ordered. Great delivery time. Will order from these guys again. 485110

It was easy to buy and easy to install thanks 480546

I have a 2004 Dodge 2500 Diesel, The TIPM (Power module) trailer light circuit which is a common failure. I replaced the non replaceable relays (according to factory) and still had issues. I installed the trailer light module and connected it to the vehicle lights, thus eliminating the trailer circuit all together. Now the trailer has a circuit breaker in case of overload, and automatically resets. Solved the problem without spending $750 for a new TIPM. I should have done this in the first place and it would have saved me a lot of time and trouble. etrailer folks are always knowledgeable and helpful. I received the unit ahead of promised time and it installed quite easily. 479335

I like the fact my mechanic installed the harness so that it stores out of the way in my trunk next to my spare tire. It is a clean looking installation. 471991

Everything arrived fast & install was straight forward. The only thing that would have been nice is a wiring diagram for the electrical. The website had it so I was able to get it done but including it in the order would have been nice. 461817

by: Jerry12/07/2017

Excellent custom product with perfect i nstructions. 457893

Worked well 455364

The Lighting kit was relatively easy to install following the instructions and works flawlessly. When I received it some pieces were missing but the customer service was excellent in getting the missing pieces sent out right away. I am very happy with my purchase. 447817

by: S.Bird09/05/2017

2017 Kia Sportage

Harness worked perfectly and was easy to install for someone who is comfortable doing minor auto electrical. 429032

Its still working great!

S.Bird - 09/06/2018

by: Michael08/17/2017

1997 Volvo 960 Series

Worked great with my Volvo 960 no problems easy install Thanks Michael 421423

by: 1silica08/13/2017

2013 Chevrolet Volt

Excellent installation video. 419703

Easy to install. Took about an hour and half. Main issue was the 4 bolts holding the bumper on my vehicle. 2009 Audi Q7. 421692

by: Dave S.07/05/2017

2014 Lexus RX 350

My RX350 Lexus did not have a towing package, and I used this kit for getting all the trailer lights to work. It took me a little more time to make the electrical connections as I needed to probe individual wires to ensure I was connected to the correct wires. Once completed, everything worked fine and still does. Glad I did it. 401802

Still works.......

Dave S - 07/06/2018

by: William R.06/23/2017

2016 Mazda CX-9

I works well / as intended - but it's complex and cost me a bundle to have it installed. 398055

The product is good. I had to print off the instructions but that is not a big deal. It was readily available at the product info. Connected everything and it works as stated. Looked up vehicle wiring from manufacturer website. 387937

by: Dave E01/26/2017

2007 Volvo XC70

119147KIT Still working perfect on my 2007 XC70 super easy install with great instructions! Etrailer is the best! Unbelievable value and quality compared to OEM Volvo. THEY WANTED $300 bucks to accomplish the exact same task! Thanks etrailer! 335665

Still working Great after 1 Year

Dave E - 01/27/2018

by: Savanna09/26/2016

Volvo

we're very happy with our Etrailer power setup on our Volvo.. 299998

Easy to install, it just takes time. Connecting all the wires in the back of my 1999 Dodge Ram 1500 was quick and easy. Running the wire to the battery and hooking it up took the most time but still easy enough to do myself. Since I also got ETBC7, I ran both wires together up to the battery. The wires on my vehicle had the same color coding as the harness so I didn't have to probe any of them to see which was the left turn signal, the right turn signal, or the running lights. 284245

by: Good wiring for BMW X108/13/2016

2014 BMW X1

I installed this wiring kit on my 2014 BMW X1 to use with my small boat trailer. The installation was easy and I had no trouble making it work. I do recommend that you use the included tester to determine which wires are which, and don't rely on advice from the Internet as to the wiring color scheme. Anyone who is comfortable drilling a hole and working with simple wiring should have no trouble installing this themselves. 283413

Could use more information on installation. This would allow faster install times. 271293

The product was just as pictured. the real help came in the form of the youtube install instructions. I set up my iPAD and started the install. This made it soso easy. Thanks Etrailer. 260135

Firstly, great customer service. Product came very quickly with the expedited processing at check out. Item was well packed exactly as described on the site. Installation was a breeze and my rig is ready for the road! Thanks etrailer! 258422

Order came as stated, Installed and works great. 257917

The video on your website showing every step of the install was SUPER helpful. I didn't even need to use the circuit tester because the guy in the video described the wiring so accurately. One need for improvement: The green wire that goes over to the passenger side tail light needs to be about a foot longer to fit correctly in a 2013 Chevy Volt. Other than that, perfect! 252311

good looking, looks like all the pieces needed are included, will get it install this week sometime. 243766

Just completed the installation of the 119147KIT on a 2014 Lexus RX350 and it works great. Everything needed was included in the kit and the installation process was fairly easy. As always when I purchase items from e-trailer things fit and the right amount of supplies are included as well as installation instructions. i have always had excellent service from e-trailer and have great confidence in doing business with e-trailer. I know that i will get a great product with support, if needed, and always a follow up e- mail to see if everything was OK. Great place to shop. 236326

This was installed on a Lexus that does not have the factory tow package. It work just fine and has had no negative effect on the vehicle. Note, I tow a very small utility trailer on short trips and wanted the lights on the trailer to work properly.

Hans H - 01/28/2017