1. Wiring
  2. Tekonsha
  3. Trailer Connectors
  4. Vehicle End Connector
  5. 4 Flat
  6. Plug and Lead
ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit

ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit

Item # 119250KIT
lowest price pledge
Retail:$224.43
Our Price: $157.66
You Save: $66.77
Wiring
This item qualifies for Free Shipping
Shipping Weight: 1.97 lbs
Quantity: 
In Stock
Tekonsha Wiring - 119250KIT
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

2018 Tesla Model 3 wiring from Tekonsha. Product reviews from other Model 3 owners. Expert wiring advice with thousands of helpful questions and answers. Guaranteed lowest price and fastest shipping.
  • All Info
  • Reviews (32359)
  • Q & A (819)
  • Photos
  • Why etrailer?

Tekonsha Wiring - 119250KIT

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

Install a 4-way trailer connector on your vehicle without cutting or splicing into your wiring. Zero-contact interface sensors identify the current flowing through each wire by simply clamping onto it. Circuit-protected module is made using SMT.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole, and 7-pole adapters (sold separately)
  • Bypasses factory wiring and involves no cutting, splicing, or plugging into vehicle's wiring
    • Sensors clamp onto the wires of your factory tail light wiring harness to detect current
    • No feedback, no interference with, and no power draw from your vehicle's wiring system
    • Easily removable and transferrable between different vehicles
    • Circuit tester included to ensure proper setup
  • Includes circuit-protected module that connects directly to car battery for power
    • Power wire, fuse holder, and 15-amp fuse included for installation
  • Works with 2-wire, 3-wire, PWM, and multiplex wiring systems
  • Constructed using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimal heat
    • Ensures superior operation in rough road conditions
  • Comes with dust cap for 4-way flat connector


Specs:

  • Application: vehicles with 12V electrical systems
  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


This revolutionary wiring method makes it fast, easy, and safe to add a 4-way connector to your vehicle so you can power your trailer's lights. Unlike traditional tail light wiring harnesses, which either splice into your vehicle's wiring or plug into designated ports in your factory harness, this system bypasses your vehicle's wiring entirely. Just clamp the intuitive sensors onto the individual wires of your OEM tail light harness and let the ZCI system do the rest.


Zero-Contact Interface Sensors

Sensor

Each zero-contact interface (ZCI) sensor included with this harness is able to read the current that travels through the wire it is clamped onto. Upon sensing the specific modulation of that wire, a signal can be sent along the wire that connects the sensor to the included 4-way flat trailer connector. That signal is then transmitted through the connector to activate the appropriate function on your trailer lights.


Universal, Worry-Free Design

No Splicing, Cutting, or Connecting to Factory Wiring

Because the ZCI sensors can read the signals sent through your vehicle's wires just by clamping onto them, no cutting or splicing is necessary. The system completely bypasses all of your vehicle's wiring. As a result, your trailer's lights will be powered without overloading your vehicle's electrical system. And there is no chance of damaging feedback either.


When using this ZCI harness, you don't have to worry about voiding your warranty, nor do you need to be concerned about any potentially damaging errors on your part if you're not an experienced do-it-yourselfer. And if you have a vehicle that doesn't allow certain modifications - like a leased car or truck - you can install this harness and remove it later with no obvious alteration to the vehicle.


Maximum Compatibility

This wiring harness is universal. You can use it on any vehicle that operates on a 12V, negative ground system. Because installation is so simple, you can easily remove the unit and transfer it to another car or truck at any time.


In addition, the ZCI sensors are able to read the signals sent by multiplex wiring systems and systems with pulse width modulation (PWM) and low-side-switched wiring, making the harness compatible with nearly all automotive wiring systems. This unit also works with both standard incandescent tail light bulbs and LED bulbs.


Built-In Tail Light Converter

Most trailers run on a 2-wire system - wherein the brake and turn signals are carried on a single wire. Many vehicles, however, are built with separate brake and turn signals. This type of system is referred to as a 3-wire system. If your vehicle operates on a 3-wire system, it will need to be converted so that it will be compatible with the wiring system of your trailer. This is done by adding a tail light converter to your wiring setup to combine the brake and turn signal functions of your automobile so that they run on a single wire to properly activate your trailer's tail lights.


This ZCI unit has a tail light converter built in to ensure proper functioning with any vehicle that operates on a 3-wire system. If your car has a 2-wire system and therefore does not need a converter, don't worry. The method of installing the sensors will take into account the wiring configuration of your vehicle so that only the necessary sensors are used, making sure the appropriate signals are sent back to the 4-way.


Installation

This universal harness connects to your vehicle's tail light wiring harness. To connect, just follow the included instructions. There are 4 ZCI sensors included. Each sensor has a colored label on it. Depending on your application, you will need to connect all or some of these sensors to the factory wires indicated in the instructions.


To get the power necessary to operate, the harness must be connected to a 12V power source. The included installation kit provides the hot lead required to connect this module to your car battery. When all connections have been made, connect the hot lead to the black wire on the ZCI power module and run the other end of the lead up to your car battery. Connect the hot lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery. Then insert the included 15-amp fuse into the fuse holder.


Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location either within your cargo area or beneath your vehicle, near the trailer hitch. If you choose to mount the connector near your hitch, a mounting bracket (sold separately) is recommended to keep the connector secure.


It is also recommended that you use a small amount of grease on all electrical connections on the 4-pole connector to help prevent corrosion.


Surface Mount Technology

Each ZCI wiring harness is built using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability, and durability.


Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? SMT components also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.



119251 Tekonsha ZCI Zero Contact Interface Universal ModuLite and Installation Wiring Kit

48705 LED Circuit Tester - 12 Volts

Installation Details 119250KIT Installation instructions

California residents: click here



Customer Reviews

ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit - 119250KIT

Average Customer Rating:  4.8 out of 5 stars   (32339 Customer Reviews)

Install a 4-way trailer connector on your vehicle without cutting or splicing into your wiring. Zero-contact interface sensors identify the current flowing through each wire by simply clamping onto it. Circuit-protected module is made using SMT.

- 119250KIT
by:

Product installed just fine. Very easy. Installed converter box on drivers side as the video's show. I bought a draw tight hitch and installed two weeks later then the harness. I guess if I want the harness plug installed and mounted on the hitch then the harness converter box needs to be installed on the passenger side instead. I only plan on towing a trailer and using the harness very seldom so for now I will leave it coiled up in the driver side storage. No cutting of vehicle wires so sure worth the extra price.


Comments
The wiring has worked as expected installed was super easy. I do service work so I have a good understanding of wiring. Works great
Thomas H - 03/03/2021


- 119250KIT
by:

I received the trailer hitch and wiring extremely fast. I had the hook up made today and the hitch looks great. Great price and service! Thank you Greg!



- 119250KIT
by:

Awesome trailer hitch. My husband thought I was kidding when I said I had found a hitch to fit my MINI - while keeping the sleek lines of the car. Fit perfectly and so streamlined that it's barely noticeable. You CAN drive a MINI and pull a small trailer with two kayaks!


Comments
Still working perfectly.
Ann T - 09/24/2020


- 119250KIT
by:

The trailer hitch and wiring assembly have worked flawlessly. After calling several local installation outfits and receiving estimates of $2,000+ I decided to install myself. I have a little mechanical experience but this was the first hitch and wiring harness for me. This is my wife's X5 so I was a little nervous about popping rivets and pulling the rear bumper cover off, but eTrailer has excellent step by step video instructions by model year. The order included replacement rivets and detailed instructions. They could not have made this any easier. I really took my time and completed the job in about 5 hours. The final install looks professional and clean. The no-splice wiring harness is amazing - worth every penny. Tools: I was able to easily pop off the existing plastics rivets, and installed the new rivets (included from eTrailer) with pliers pretty easily - you may want to borrow a plastic rivet gun from your local hardware or auto parts store. On the X5 your have to cut a small notch out of the underside of the bumper cover. I happen to have a Dremmel which worked well. You may be able to use a razor blade. The plastic is not that thick. Pictures are attached. Thanks etrailer!



- 119250KIT
by:

Installed on 2018 Jeep Grand Cherokee Limited with no tow package. Install was kind of a P.I.T.A. But worth doing on your own to avoid the stealership. Not too much electrical knowhow required, as the black wire on Jeep tail lights are all ground. Running the power cable was the most difficult part, and required removing the interior rear quarter panel, which I managed to break a plastic clip. Would not recommend this on a Jeep, as there is no simple way to install this on the interior of the vehicle since the tail lights are wired 100% outside of the car. I’d say skip if you are looking into this for a Jeep, and wait for an OEM trailer harness to come out from mopar.



- 119250KIT
by:

This installed directly, didn't require cutting the original wiring, worked on the first test for all functions (lights, turn signals, and brakes), and is working perfectly one year later. Great purchase. I saved a ton over having the car dealership install one. I would do it again in a second!


Comments
Yes, two years later and it still is working flawlessly. I use it intermittently, several times a year. I plug in the trailer and it never fails even though the car is used every day and stored in a relatively damp garage. Apparently no corrosion. Yes. This is a great product. Follow the videos for installation.
Lawrence M - 07/19/2020


- 119250KIT
by:

The Tekonsha wiring harness was a bit difficult to install, as the clip-on connections are a somewhat bulky to fit in my Tesla Model 3's tight spaces. The good news is: they work as promised like a charm with our tiny camp trailer's lights. In truth, I have only had to use them once, but cannot imagine that any unforeseen problems would occur with them in the future.



- 119250KIT
by:

2012 VW GTI (autobahn edition) Installation (DSG) I had some small issues and hiccups along the way, so in order help out since I couldn't seem to find vehicle specific help, here is what I did. I did buy the CURT 4-way flat connector tester (Item #126) first to make my life easier when testing. It helps. Buy it. First - start by removing the cargo floor carpet and pulling down the drivers side wall carpet. I did find it necessary to take the moulding trim off the top portion of where the hatch cover locks in, along with the rear seat belt guide trim so I could run the wires to the battery cleanly. There is a few star bolts holding the trim alongside the rear seats when folded down, so just do a search if can’t find it (one cover has to be popped off) Second - Wiring. This was a little bit of a guess, as I have 3 wires, and my meter didn’t seem to be helpful since they were so small and close together. Here’s what works (drivers side): - “Stop” module clips over the black/red wire - Middle brown wire isn’t used - “Left” turn signal module clips over the green/black wire - Passenger side right turn signal clips over the green/black wire - I screwed the ground right into a side structure panel Running the battery cable was the bigger time suck. - Stated above I had the drivers side rear panel trim and carpet removed, and I continued removing the front/rear drivers floor sill trim. I ran the black wire along the current loom and tucked it under the floor carpet. - I then ran it behind the hood latch and towards the top of the metal foot rest, keeping it behind the carpet - This is where you get to the firewall. There is a piece of foam. Remove it. Now you’ll see a rubber grommet where the clutch pedal would go through if you have a standard. I took that out, drilled a small hole to run the wire through that I attached the wire to a metal hanger to fish up and to the right of the battery box. Fish it up, grab it, and pull it through. - Slide the grommet back into place (your wire would have been already through it) and snap it on. - Make your connection to the battery and follow initiation instructions.



- 119250KIT
by:

The wiring harness worked great, without having to tap into existing wiring. The only reason I didn't give it five stars is that occasionally the trailer lights don't match up with what the car is doing when I first connect it. However to correct this all I need to do is pull the fuse on the wiring harness and plug it back in, and the unit will relearn the way it's supposed to work.



- 119250KIT
by:

This was installed on my 2017 Chevy Bolt which does not have any trailer pre-wiring available. Installation was a bit challenging because of getting access to the correct tail and directional lights on the Bolt. I like that no splicing or other interference with the Bolt's wiring is involved. The installation process otherwise was straightforward. We did have to "train" the system but that's explained in the installation instructions. The lights have worked perfectly.


Comments
Excellent. One year of use and wiring has worked perfectly every time.
James H - 04/23/2020


- 119250KIT
by:

Directions not as clear as I needed to get the system installed. Routing the power cable from back to front of vehicle proved to be the most challenging. Wanted to ensure it wasn't going to be pinched or cause a short in the system. In the end, I was successful but took me longer to accomplish than I planned hence the three stars.



- 119250KIT
by:

This kit works perfectly! A reasonably straightforward installation, though not for a DYI'er who is uncomfortable ripping into the trim and lighting wiring harness of their vehicle. A reasonably accurate wiring diagram is very helpful, but not necessary because trial and error works well with Hall sensors used in this kit (i.e. no cutting and splicing wire is required). Once installed, the trailer lighting load is easily handled by the power module without feedback to the vehicle lighting control circuit, although my setup does not interface with a trailer brake controller so I cannot judge full performance. One hint - do not loose the heavy stock reference card that reminds one of the programming routine, While performing other electrical work on my car needing battery disconnection, I can never remember the programming sequence for the trailer lighting controller. Not to worry, though, the product support site has the info.



- 119250KIT
by:

Second hitch from etrailer, now for my new X5 F15. It’s perfectly fit this car, I like Curt brand better, no bumper trimming was needed for 2015 model. With great video of how to install it it takes just about 2 hours to do it properly. Thank you for having also 4 pin wiring for this car, as other option would only be buying from the dealer at a huge price.



- 119250KIT
by:

I purchased the trailer hitch and the wiring kit for the tail lights. My 2016 BMW X3 is very complex but the wiring kit matched perfectly with no problem. The hitch however requires a fair level of expertise. It took me 4hrs. I'm a 76 yr old retired mechanic. It can be done!



- 119250KIT
by:

This is the 2nd hitch I’ve bought and attached myself. Each vehicle was a Honda van 2016 and 2019. Easy to install and no prob using it. Great product.



- 119250KIT
by:

Etrailer provides options that can satisfy when others are totally deficient. My vehicle a 2013 Merc was exceptionally difficult to fit with a unique body style according to the last installer to schedule me for an appointment. It was not safe. It can only tow 3500 lbs etc ... . The local dealer wanted $3k to do a partial install. They would install the hitch, lights, and brake wiring. Of course OEM costs more than after market. So, long storyshort, I attempted contacting several installers for a better price. Major box brands, large installers, and one guy shop owner across multiple states. It was a logistical nitemare for one. Most wanted to install a bike hitch with 3500 lbs towing capacity. My vehicle was purchased with the understanding that it could tow 7500. Another shop was not able to do anything except OEM. This a $500 savings Finally I gave up trying twice to drop the vehicle off at an installer. One alledgedly ordered the wrong hitch. Another refused the hitch that I purchased. Etrailer provides the right equipment, right price, and the right level of support. Instead of hoping the other guy can over come his ignorance in the MB product lines. You can trust the expertise of etrailer.



- 119250KIT
by:

Installed easily and has worked flawlessly for over a year to light the trailer lights on a small sailboat trailer. I like the fact that you don't have to cut into any wires, especially on a Tesla Model 3 where the logic may detect different loads. Opted to skip the long run to the main 12V battery, and just place a small 12v lead acid battery in the trunk when towing. Recharge at home on a 12v battery charger we had already (for car batteries), and works very well.



- 119250KIT
by:

Installed on my 2017 Corvette Z06. Easy install and works great. Suggested by one of there tech’s to not void the warranty. No wires get cut or pierced. Thanks for a great product.



- 119250KIT
by:

All the trailer specialists in my area told me they had to splice the wires for my 2017 Mercedes Benz GLE. The dealer quoted me $4700 + tax! I went online and easily found an article on my vehicle written by a specialist at etrailer about wiring that did not require splicing for my vehicle! I called and spoke to a wonderful representative as I wanted to be sure I understood it correctly. She was awesome and I placed the order with her. The equipment has yet to be installed by my garage but I'm confident it will go smoothly.



- 119250KIT
by:

Plug and play worked great



- 119250KIT
by:

Combine this kit with a couple of YouTube videos (Thank you U-haul), the installation isn't difficult. Do purchase a circuit tester with an attachment that wraps around a wire and pierces the insulation. The cheap circuit tester that comes with the kit is worthless.



- 119250KIT
by:

I followed the instructions carefully, checked everything three times; it still doesn't work (no electricity to the flat four plug). On March 1, I have an appointment to have a professional hitch place check it out.


Comments
Thank you for your review. It sounds like you may have an issue with the 15 amp in line fuse of the power wire. Ensure the fuse is fully ed into the fuse holder and that the wire is fully connected to the positive side of the battery. Also make sure to check the vehicles frame ground to make sure the ring terminal is in full contact with bare metal of the vehicle’s chassis.
-- Etrailer Expert Heather A - 03/02/2021


- 119250KIT
by:

My son installed the hitch and the wiring. Hitch was installed and wiring took about 3 hrs. He’s a auto technician and he was amazed seeing a wiring without slicing. Great product.



- 119250KIT
by:

The hitch installation was fairly straightforward. My 2019 SR+ required no drilling and only some eyeballing to get installed properly. Cutting the underbelly was the only irreversible modification I made to the car. This hitch does not have the removable reciever, which seems a bit stronger to me. Just add a Tekonsha no cut wiring kit and a 6 inch drop ball mount and the car tows great.



- 119250KIT
by:

I selected this kit to install in my 2008 BMW X5 because I didn't have to splice into my vehicle's wiring and risk damaging something and it was extremely easy to install. It turned out to be even easier than I originally anticipated. Total install time was about 45 minutes start to finish. And even better, if I ever need to remove the kit from the vehicle, there won't be any trace that anything was ever installed. Difficulty level to install on a scale of 1 to 10 with 10 the most difficult is about a 2. Works perfectly as described. Highly recommend over any other trailer wiring kit available.


Comments
I’ve been using this wiring harness now about a year to run several small trailers with no problems. I always check all trailer lighting afyer hooking up and no issues.
DougR - 07/13/2019


38
3905
Show More Reviews

Ask the Experts about this Tekonsha Wiring

  • Recommended Wiring Harness and Hitch For 2019 Chevy Bolt
    For a wiring harness on the 2019 Chevy Bolt I recommend the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit part # 119250KIT which is a clamp on style wiring harness. There is not a custom plug and play option available for the Chevy Bolt but the wiring harness clamps to the vehicle wiring instead of splicing in so this is your best option. If you need a hitch, I recommend Draw-Tite Sportframe Trailer Hitch Receiver part # 24956 which...
    view full answer...
    Image 1 for
  • Recommended Trailer Wiring Harness for 2011 BMW X3 28I
    For your 2011 BMW X3, the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT is a great choice if you don't want to splice into your vehicle wires, but it is more expensive due to the zero contact interface sensors. If it were me, I'd use the Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit # 119190KIT confirmed to fit your vehicle and use the quick splice connectors on the factory wires....
    view full answer...
  • Troubleshooting Trailer Wiring 2011 Mercedes GL350 Converted to LED No Brake Lights
    Since we aren't totally sure if the issue you have is due to your vehicle not wanting to work with LED lights or if it's due to the trailer wiring having a problem let's first determine which issue is at fault. Using a 12 volt jumper wire from a source like a vehicle battery's positive post try jumping the voltage to each of the stop/turn circuits to see if you can get the brighter illumination to come on. If so then the problem is that your Mercedes doesn't like the LED Lights and you'd...
    view full answer...
  • Trailer Hitch Receiver for 2013 Mercedes-Benz E350 Sedan
    There is a trailer hitch receiver that I confirmed with the manufacturer fits your 2013 Mercedes-Benz E350 sedan, the Curt Trailer Hitch Receiver # C11001. If you plan on doing some towing, the only 4-way that fits your Mercedes is the ZCI Circuit Protected Vehicle Wiring Harness # 119250KIT. You will also need Curt Class II Drawbar # C45521, Pin and Clip # F-4, and either 1-7/8" Hitch Ball # A-80 or 2" Hitch Ball # A-82.
    view full answer...
  • How To Power Trailer Lights From a 2015 Mercedes-Benz GL-550 Without Tow Package
    In order to power the trailer lights on a 2015 Mercedes-Benz GL-550 without tow package you will first need to start with a basic four way trailer wiring harness. The ZCI Circuit Protected Vehicle Wiring Harness part # 119250KIT is what I recommend since it is the only option for this vehicle that does not require splicing. However, if you are okay with splicing and looking to save some money then the Curt Powered Tail Light Converter part # C59236 will still work. The above will then...
    view full answer...
  • Trailer Wiring Kit Recommendation for 2013 Mercedes GLK350
    The best trailer wiring harness for your 2013 Mercedes GLK350 is the ZCI kit part # 119250KIT which does not require any splicing to install and is a very reliable and well-made kit. This kit comes with everything you'd need to install in your vehicle.
    view full answer...
  • Trailer Wiring Recommendation for 2019 Volkswagen Golf Sportwagen
    I have a great trailer wiring solution for your 2019 Volkswagen Golf Sportwagen, but the Hopkins kit part # 46255 that you referenced is not a confirmed fit. Instead the Tekonsha ZCI kit part # 119250KIT would be what I recommend. This is a similar universal style wiring kit but instead of forcing you to cut into the wiring of your vehicle you just attach sensors to the wires which makes for a much easier and less invasive install.
    view full answer...
  • How To Add a 7-Way To a 2017 Audi Q7
    If your 2017 Audi Q7 did not come with the factory tow package which if I had to guess would be the case since you are looking for a trailer connector then there are no custom fit trailer wiring harness adapters available. That said, I do still have a splice free option in the ZCI Circuit Protected Vehicle Wiring Harness part # 119250KIT which uses clamp-on sensors. The ZCI Harness only has a 4-way output but you can adapt this to a 5-way with the part # 20036 or to a 7-way with the part...
    view full answer...
  • Is There a Wiring Harness That Fits 2012 BMW X5?
    There is a wiring harness available for your 2012 BMW X5 that will allow you to tow your popup camper. The ZCI Circuit Protected Vehicle Wiring Harness # 119250KIT will install in your SUV via clamps and a module that connects to your car battery to get power. This will not require you to go to your dealer for any type of programming and is a straightforward install. I recommend using mounting bracket # 18144 to keep the 4-way in place as you tow. I also recommend checking out Ball Mount...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2016 Audi Q5
    We have a trailer wiring harness for your 2016 Audi Q5 that does not require hardwiring to install. For that you'd want the ZCI kit part # 119250KIT. This kit uses sensors that attach to the wires instead of quick-splices so you have a very non-invasive wiring kit install. I attached an install video for this kit on a 2018 Audi Q5 which will be very similar to your 2016 Q5.
    view full answer...
  • How to Install the ZCI Wiring Harness on a 2019 Volkswagen Golf Alltrack with Multiplex Wiring
    In regards to installing the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector part # 119250KIT on your 2019 Volkswagen Golf Alltrack, you may need to attach the wire connector with the brown sticker to the rear license plate illumination circuit and the wire connector with the red sticker to the center high stop light if the stop position and tail lights pins inside the trailer connector on the above harness do not work after installing the wire connector with...
    view full answer...
    Image 1 for
  • Trailer Hitch Receiver Fit For 2021 Lexus RX 450h
    We do have a trailer hitch receiver that is a fit for your 2021 Lexus RX 450h. I was able to confirm with Draw-Tite that they do have a hitch which fits your '21 RX 450h, which is the following: - Draw-Tite Max-Frame Trailer Hitch Receiver # 75540 I have added a link below to the installation instructions for you to check out as well if you'd like. And if you plan on doing some towing and need a wiring harness for your 2021 Lexus RX 450h, we have that as well with the ZCI Circuit...
    view full answer...
  • Difference Between Tekonsha 119251 and 119250 ZCI Wiring Harness for Mini Cooper
    The 119251 part that you referenced is actually the same as the Tekonsha ZCI Circuit Protected Wiring Harness # 119250KIT, which is indeed a fit for your 2010 Mini Cooper. We simply use a different part number on our end for organizational purposes, but both numbers refer to the same exact kit from Tekonsha (the 119251 is the number Tekonsha uses). This is a great kit for your Mini Cooper as it uses zero-contact interface sensors to identify the current coming through the factory wires...
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2010 BMW X5
    For trailer wiring on a vehicle that requires a universal type harness the ZCI part # 119250KIT would be the best kit available since there would be no hardwiring required. The sensors are pretty big, but you should have no problem getting them around the wires of your 2010 BMW X5. I attached an install video that shows a hardware kit being used to install on a similar X5 as yours that shows you how to find the wires and which to use. In the video around the 1:07 mark you can see...
    view full answer...
  • Recommended Wiring Harness for 2015 Mercedes-Benz GL450 with Existing 7-Way Connector
    The Tekonsha ZCI Circuit Protected Vehicle Wiring Harness # 119250KIT referenced in your question is confirmed to fit your 2015 Mercedes-Benz GL450. This will install a 4-Way connector at the rear of your vehicle without cutting or splicing into the wiring, as the zero-contact interface sensors will identify the current on each wire simply by clamping onto it. Then on the back of the 7-Way connector that is currently mounted to the hitch, check to see if there is also a 4-Way on it,...
    view full answer...
  • How Does ZCI Trailer Wiring Kit #119250KIT Install on a 2015 Volkswagen Golf Sportwagen
    I checked with my contact at Tekonsha and he said to use the BTT code to install the ZCI part # 119250KIT that you have. This means to to run the yellow to the vehicle brake/tail/left turn, green to the brake/tail/right turn and then the brown and red wires would not be used. It sounds like you have tried using the B configuration and that is why you are having problems. I attached a diagram that shows the different ways you can use this box to wire up to a vehicle. To answer...
    view full answer...
    Image 1 for Image 2 for
  • Adding a 7-Way Trailer Connector on a 2013 BMW X5 to Power Trailer Brakes
    The easiest way to add a 7-way trailer connector to your 2013 BMW X5 is to start with a 4-way and then convert it to a 7-way. You can either hardwire in a kit, like part # 119190KIT, or use the ZCI kit, part # 119250KIT, instead. The ZCI sensors that clamp to your X5's wiring to detect the current flowing through the wires instead of being spliced in. This way you don't have to cut into the BMW's wiring. I've linked videos of both wiring harness being installed on X5's similar to...
    view full answer...
  • Recommended Trailer Wiring Harness for a 2018 Mercedes Benz GLS 450
    The trailer wiring harness I recommend for a 2018 Mercedes-Benz GLS 450 is the ZCI Circuit Protected Vehicle Wiring Harness part # 119250KIT which is the only option that does not require splicing. If you don't mind splicing and want to save some funds you can use the Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit part # 119190KIT.
    view full answer...
  • Best Trailer Wiring Kit for my 2008 BMW X3
    For your 2008 BMW X3 I recommend using the ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit part # 119250KIT. This is our most recommended kit for vehicles that don't have custom fits. When installing there is no cutting or splicing of your factory wiring harness which I really like. You'll simple follow the instructions and match each connector to the appropriate wire then run the power wire to your battery. To determine which...
    view full answer...
  • Will a 2012 Mercedes-Benz ML350 Need to be Recalibrated After Installing Trailer Light Wiring
    You will want to install the Tekonsha ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector # 119250KIT for wiring on your 2012 Mercedes-Benz ML350. This product draws power from the 12V lead that is run to the battery and then sends a signal to the trailer connector once it detects that your light functions are being utilized. It does not require anything to be recalibrated on any vehicle that it is installed on. I confirmed this with my contact at Tekonsha....
    view full answer...
  • Trailer Wiring for 2017 MINI Cooper S Clubman
    For a trailer wiring harness confirmed to fit your 2017 Mini Clubman S that does not require any splicing you'd want the part # 119250KIT which is a confirmed fit and will work well. It's not a custom fit that matches the connectors of your vehicle, but since it uses sensors instead of splices it will install without any hardwiring. For a ball mount you then would want the part # C45521 and then for a ball part # 19256.
    view full answer...
  • Troubleshooting Curt Trailer Wiring of 2017 Honda Ridgeline Not Functioning After Install
    Did you use a circuit tester like part # PTW2993 to test all of the 4-way pins of the wiring harness part # C56365? I'd start there maybe but also make sure you installed all of the fuses and relays of this kit too.
    view full answer...
  • Trailer Wiring Harness that Fits 2020 Lincoln Corsair
    For your 2020 Lincoln Corsair we have the Tekonsha trailer wiring harness # 119250KIT that you referenced as a confirmed fit which is a really great option as it's easy to install and very reliable but the other option you mentioned does not fit and is not the way to go.
    view full answer...
  • Troubleshooting Tekonsha ZCI Item # 119250KIT Installation On 2016 Porsche Cayenne
    I contacted the tech support of the manufacturer for some ideas and your are on the right track. Your 2016 Porsche Cayenne has dedicated wires for each function and also has wires that are multi-function. To get everything to work correctly with the Tekonsha ZCI Vehicle Wiring Harness, Item # 119250KIT, you will need to find dedicated wires for each function (tail, brake, turn, etc.). Unfortunately, there are no "shortcuts" and you will have to continue the "trial and error" testing...
    view full answer...
  • Recommended 4-Pole & 7-Way Trailer Wiring Harness for 2009 BMW 335d
    The easiest 4-pole wiring harness installation will come from the no-splicing-required ZCI Circuit Protected Vehicle Wiring Harness # 119250KIT. This 4-pole harness installs simply by clamping around the Bimmer's taillight wires; you do not have to cut or splice anything in the vehicle. This harness does cost more than the hard-wired type like Tow Ready # 119179KIT, shown in the linked video, but the installation is non-permanent and the harness can easily be transferred to another vehicle...
    view full answer...
    Image 1 for
  • 2015 Volkswagen Golf Sportwagen TDI SE Trailer Wiring Recommendation
    For your 2015 Volkswagen Golf Sportwagen the only trailer wiring kit we offer that has been confirmed as a fit is the part # 119250KIT. This will require that you run a wire up to the batter of the vehicle as well. I attached an install video that shows how it would install in a similar vehicle.
    view full answer...
  • Which Way do the Sensors for the ZCI Wiring Kit go on my 2014 Audi Q5
    Great news this is easy to determine! When installing the ZCI Circuit Protected Vehicle Wiring Harness part # 119250KIT the arrows should be pointed to the light. So in this case the arrows should be pointing upwards on the harness because that is where the light signals are traveling up to the lights. I have included the video you mentioned for easy reference.
    view full answer...
  • Instructions for Tekonsha ZCI Wiring Kit Explained for a 2012 BMW 135i
    I can help explain the instructions better for the ZCI Circuit Protected Vehicle Wiring Harness # 119250KIT, but I don't have the details about the wiring on your 2012 BMW 135i so you will need to do some testing with a circuit tester # PTW2992 on your end. The first thing you need to do is determine what kind of lighting system you have by using the circuit tester to see what happens to the different wires when you use the brake pedal, turn signals, and use your headlights. You can...
    view full answer...
    Image 1 for Image 2 for




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Joe V
Test Fit:
Joe V
Employee Randy B
Test Fit:
Randy B
Employee Andrew S
Test Fit:
Andrew S
Employee Brent H
Test Fit:
Brent H
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee Jackie C
Expert Research:
Jackie C
Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Victoria B
Expert Research:
Victoria B
Employee Zack K
Video by:
Zack K
Employee Andrew K
Video by:
Andrew K
Employee Kathleen M
Video by:
Kathleen M
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y
Employee Michael B
Video by:
Michael B
Employee Lindsey S
Edited by:
Lindsey S
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Sarah W
Updated by:
Sarah W
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
Updated by:
Isabelle B
Employee Amanda M
Written by:
Amanda M

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.