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  1. Custom Fit Vehicle Wiring
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  4. 2014
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FITS 2014 Toyota RAV4
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118578
Our Price: $77.11
You Save: 36%
Custom Fit Vehicle Wiring
Confirmed to Fit
2014 Toyota RAV4

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Tekonsha Powered Converter Custom Fit Vehicle Wiring - 118578
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Call at 1-800-940-8924 for expert service. We are your Toyota custom fit vehicle wiring experts, and offer a great price. carries a complete line of Tekonsha products for your Toyota RAV4 2014. T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part 118578 from Tekonsha can be ordered online at Complete custom fit vehicle wiring installation instructions and technical support.
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2014 Toyota RAV4 - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your Toyota RAV4 with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


  • 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)
  • Connects quickly and easily
    • Locate connection points in trunk
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located inside your trunk, behind the tail lights on both the driver's side and passenger's side. You will need to remove some interior trim or carpeting to access the harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.

Once installation is complete, the 4-way flat connector will be stowed in an out-of-the-way location within your trunk.

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

ModuLite Powered Tail Light Converter

A ModuLite power module is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.

118578 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118578 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118578

Average Customer Rating:  4.8 out of 5 stars   (556 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

2018 ToyotaRAV4

Outstanding! Worked perfectly. However, the video didn't describe the 2018 RAV4 Hybrid install. Connecting the tail-lights was the same, but the module/battery install was different. I read several of the Q&A's about hybrids, but couldn't find any of the references to the supporting videos. I mounted the white neutral wire to the battery frame ground rather than using the "zip" screw. I didn't have to use any of the black power wire extension. The fuse wire was long enough to easily reach the battery positive terminal. Also, I used heat-shrink tubing rather than electrical tape to cover the splices. Thanks for providing a quality product.

Great! No problems at all!
William K - 05/24/2022

2018 ToyotaRAV4

the item #118578 wiring harness was as advertised.Installed easily and the installion video was a real help. Good product.

2015 ToyotaRAV4

Working great. My old Curt T-Connector had a short which had the lights slightly on when connected to the car. Went from 10amp to 15amp fuse hope it last for a long time.


Excellent quality. Straight-forward installation. The etrailer video was very helpful.


I’ve used this for over a year so far without any issues. Installation was easy, plug-n-play.

2017 ToyotaRAV4

I think that the product overall is good. But, I don't think putting this Assy. together is for novices. The video was helpful but, I improved on the safety and more professional installation. One thing I have a problem with is running the hot wire over the sub frame of the car. This is how the video shows the installation. The first time you go to your tire dealer for tires he probably will place his lift support guess where? On top of the hot wire you ran over the sub frame. Guess what happens then - Electrical short! I drilled an additional hole (in the sub frame) and then ran the wire through a piece of rubber hose for protection. Also, an electrical plug mount is welded on the hitch. Why not use it rather than slamming your trunk on the plug wire? Such an armature set up.

It is working out fine. I only use my Rav 4 for pulling small light trailer. I think that my pictures show a quality professional job. I was a machinist for many years and can make custom parts that I needed.
John D - 07/24/2019


I purchased this hitch for my 2018 RAV4. It was easy to install (you will need a second person to help hold it up while bolting it up). It fits well and does not get in the way of anything. I would highly recommend this hitch. I use it mainly to pull a small utility trailer. All in all, a very worthwhile purchase!


Bought these products for a 2018 Rav4 Limited. Everything was perfect with he exception of the holes did not line up exactly to mount the hitch to the frame. Had to put the bracket in a vice and tweak it very slightly. When I say slightly, I'm talking just a fraction. Just couldn't get the bolts to catch the threads the way it was. The hardest part was getting all the side panels off for the brake light controler. All said and done, it was about an hour job for 2 people. This includes time to watch the installation video a couple times and stop to drink some beer. Very easy install and highly recommend.


Well made hitch, delivered on time and direction for installation was very good.

Great hitch, quality product, installed without problem. Looks like new after a year of use.
Bill - 11/15/2022

2013 ToyotaRAV4

Installation on 2013 Toyota Rav4 went exactly as instructions and videos showed. Great product for a fair price.


Went in smooth. Haven't used it yet, but electrically everything checked out when I installed it.


All the conections fit perfectly. Hardest part is prying looose the car interior molding. Hint, get some nylon prying tools online or from [an automotive] type store.
I went with the under the car battery conection.Jacking up the car, and fastening the power wire seemed eaiser than doing all the molding inside the car. Wiring has worked fine since I installed. This is my third car done with etrailer & have had no problems with any.

Year later, no problems at all.
Keith - 04/28/2022


Went together very easily. The directions were clear, the videos e-trailer produced helped a ton, the supplied wire length and zip ties were perfect. Took about 3 hours to do the install - about 2 hours to remove/reinstall the trim, 1 to run/wire it all up. Only advice on a rav4 is dont try to run the new power line inside the CAB - the firewall has no extra grommets. Much easier to pop out behind the rear drivers wheel grommet and plenty of clear pathways to zip tie to that wont get caught up in the driveline or exhaust.

My order was late but e-trailer notified me right away of the outstanding order from the supplier and communicated the entire time of the status! Super impressed by the customer service.


Easy to install however it did take sometime for complete installation. Watched the video that etrailer provided, Take your time on opening the cars inside interior panels for the brake light wire connections.

2018 ToyotaRAV4

Wow!Fast delivery that is for sure.I opened up the box and was pleasantly surprised at how nice everything looks.Seems like a nice and heavy duty hitch.It will be a bit till I can install it.Stay tuned for the install part of the review

After a year with the hitch I couldn’t be happier.It still looks nice after a winter of salt on the roads.When I installed the hitch I was surprised at how easy it was to put in.The wiring was easy as well.Just took some time to do everything right.But it makes for a clean install .
Dean - 05/07/2022

2015 ToyotaRAV4

The 76134 receiver is well made. All weld beads are continuous and consistent and the material is sized right for adequate strength and minimum weight. Mounting bolt hole pattern is right on. Paint is good and consistent with no dings or scratches. Installation was straight forward. It was necessary to procure a M12 X 1.25 tap to run through the mounting weld nuts in the frame in order to get the bolts to thread in; not a fault of the receiver but the effects of four years of over the road use of the 2015 RAV4. Also the small amount of extra money for this hidden crossbar version of a receiver was worth it when looking at the final installation.
The 118578 T-One harness kit installation was also straight forward and it works as it should. Installation was made a little less difficult with the use of the ALL648544 trim pad remover that was purchased with this order.


Outstanding hitch, wiring harness & attachments. Online help (when given the trailer manufacturer and year) chose correct size and offset for ball to perfectly align trailer and car. You can see the lawn tractor sitting absolutely level on the trailer with the snow flying. It shows why I was in such a rush to acquire the hitch. From online chat with sales agent to her selection of right fit for the particular trailer and car to the ease of installation and the perfect ride behind my RAV4...RATING: A+! Couldn't be happier. Expedited 2 day shipping arrived exactly as promised. So impressed!!! Thank you etrailer for outstanding service. Very happy customer!


Easy install, excellent instructions, seems to be high quality. Appreciate the fuse that was included in the kit. After kit install,hooked it to a neighbor's trailer to check function. Left turn good, right turn nothing. The trailer's right turn circuit was shorted and blew the fuse instead of melting wires! Damn trailer lights! New fuse all good!

Chevrolet Spark

Great wiring harness. Everything needed was included and installation was easy (as long as you know something about wiring!) as the instructions were clearly written. On this particular order, I ordered three hitches and three wiring harnesses for my Spark, Rav and CX-5. All three were excellent fit and quality.
etrailer is the BEST and has never let me down with shoddy or less than excellent products. Everything I have ordered from them is top quality and fits without adjustment or compromise!

2017 ToyotaRAV4

I mounted my new the Draw-tite 2 inch Hitch Receiver on my 2017 RAV4 in about an hour, then spent a couple of hours doing the wiring - dropped back to the video for the 2014 RAV4 to see recommendations for running the power wire up front - the 2016 video involves the RAV4 Hybrid and the battery is mounted aft. My base model's battery is under the hood. The video did not make it clear why you might want to run the wire on the passenger side of the vehicle, but once underneath it was plain enough why. Also I was able to do the entire job on my garage floor without jacking anything up, though the clearance was tight a couple of times (I'm 5'11" and 170 pounds).

I would recommend getting the trailer light tester as it removes the worry that things are wired up right. I did not feel confident in the butt connectors so I tested everything before I buttoned up the plastic trim in the back (which was the hardest part of the job, in fact). Also I had a bag of white zip ties and used those so the trailer wire routing is plain underneath. Labeled the fuse holder on the battery with a permanent marker, both as 'trailer' and '15 amp' for future reference.

It went well! The wiring kit was complete, except for the screw I added to anchor the electrical adapter box. I will be following the method of pulling the wire over the hatch gasket (watch out you don’t get it in the latch!) to plug into the trailer harness. I used this method several times with my old Honda with ‘nary a problem’.

Quality product, fast delivery and, even though the box suffered some abuse in transit (the harness was packed in its own plastic box, then in an inner box beside my hitch which managed to punch a couple of holes through the outside – third! – heavy cardboard box), the contents were complete and in fine shape. I could tell you folks have (1) done this before and (2) care!
Thank you!


If you live in an area that uses salt on the roads, run the power line inside the car under the driver's side plastic threshold panels inside a conduit. Push the wire through the rubber boot for the hood release with a metal BBQ skewer.


My products:
118578 wiring harness for
2014 RAV4
C13149 trailer hitch for 2014 RAV4

The hitch was a breeze to install. I didn't even need to drop the exhaust. I used a bottle jack to support one side just high enough so I could get one bolt started, moved to the other side and inserted the 2 bolts and the rest is history.

The wiring harness is another story due to the requirement to disassemble the rear interior trim panels. I assumed the first connector I found was it. It did not match the connector on the harness. I called for help and spoke with Cathy T. and she got me on the right track. The connectors are located about chest high, the ones I mistakenly chose are mounted near the floor. All went well other than getting my forearms a bit bloodied by the sharp edges of the plastic trim panels. saved me approximately $615.00, the dealer wanted $835.00 to install a hitch and wiring harness.


The product and support that etrailer provided was far and above what I had expected. The video on the website that helped me choose the best hitch for my car was informative and vital in picking the right one. Then the product was a great price and of great quality and delivered promptly. And most importantly, the installation video that helped me install my new hitch was very detailed and was absolutely the best part of the whole experience. Everything together made it a five star experience all the way through. Especially since I saved over $500 by doing it myself. I since have referred your company several times to family and friends who were equally impressed with their experiences. Please tell everyone involved Great Job and Thank You! I plan on buying another one soon for my son’s new Toyota Rav 4.

2018 ToyotaRAV4

The hitch and wiring harness are of good quality and installed with no issues.


Bon produit. Conforme à ce que je m’attendais. Pas eu le temps de l’installer encore pour voir si ça fonctionne bien.

Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

  • Installing Power Wire for Tekonsha T-One Harness # 118578 on 2018 Toyota RAV4 Hybrid
    I spoke with my contact at Tekonsha regarding the T-One Vehicle Wiring Harness # 118578 (which is confirmed to fit your Hybrid model RAV4). He said that you will definitely want to connect the power wire to the positive post of the battery at the back of your vehicle. There aren't any specific or alternative instructions with regards to this process but you just want to route the wire back, making sure to avoid any hot areas or spots where the wire might get pinched. You will need to remove...
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  • What Size Fuse Goes in Fuse Holder of Trailer Wiring Kit for 2016 Toyota RAV4
    The fuse that installs in the yellow fuse holder of the Tekonsha trailer wiring kit part # 118578 that you referenced for your 2016 Toyota RAV4 is 15 amp. I attached an install video for this kit on a similar RAV4 as yours for you to check out as well.
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  • Vehicle Wiring Harness With 4-Pole Flat For RAV4 Hybrid
    I reached out to my contact at Tekonsha and they confirmed that the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118578 will fit the 2018 Toyota RAV4 Hybrid. The complete install video on the 2018 Toyota RAV4 is attached to this page.
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  • Wiring Harness 118578 Installation in 2016 Toyota RAV4
    In most modern trailer and vehicle wiring the ground wire color used is typically white. This is indeed true for installing the Tekonsha 4-pole wiring harness # 118578 in your RAV4. Often this white ground wire will have a ring terminal which can help us sort out its function. The black 12V power wire does indeed connect to the battery + terminal through the included fuse holder. For reference, I linked the written instructions and a video showing this wiring kit installed in a 2018 RAV4...
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  • 4-Way Trailer Wiring Harness Recommendation for 2017 Toyota RAV4
    Since your trailer does not have brakes and only weighs 1,000 lbs the type of trailer wiring kit you'd need would be a 4-way harness. Basically the 4-way is for just providing the taillight circuits to the trailer. For that the best option is the Tekonsha kit part # 118578 which is a confirmed custom-fit. I attached an install video for more info as well. The Tekonsha brand of trailer wiring is the most reliable option we have so it's the one we recommend the highest.
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  • Recommended Trailer Wiring Harness For 2017 Toyota RAV4
    For your 2017 Toyota RAV4, I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118578. This custom-fit T-One connector plugs into your Toyota RAV4's wiring harness, which is located inside your trunk, behind the tail lights on both the driver's side and passenger's side. You will need to remove some interior trim or carpeting to access the harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to...
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  • Why Is Separate 12V Battery Power Connection Required for Wiring Harness 118578
    Thank you for your purchase of Tekonsha 4-pole wiring harness # 118578 for your 2016 Toyota RAV4. You ask a reasonable question about the installation of this item. It is not recommended to use a vehicle's auxiliary 12V power outlet to power a trailer wiring harness like Tekonsha # 118578. The reason is that doing so takes away the main advantage of using a powered converter, which is to isolate and protect the vehicle's wiring from any potential damage from a short or other fault on the...
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  • Recommended Trailer Wiring Harness for 2018 Toyota RAV4
    For your 2018 Toyota RAV4 I recommend the Tekonsha T-One Vehicle Wiring Harness # 118578. This custom harness will plug right into factory ports behind the trim panels in the cargo area of your RAV4 to provide you with a 4-Way connector to power a trailer's basic signal lights. I recommend this particular harness because it features a higher maximum amperage for its circuits than the alternatives. We also get far fewer troubleshooting questions regarding Tekonsha harnesses than we do with...
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  • Best Trailer Wiring Harness for 2018 Toyota RAV4
    The wiring harness I recommend for your 2018 Toyota RAV4 is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118578 because it is easy to install on your RAV4; you will only need to plug it into connection points in your rear cargo area and run a hot lead to your battery. Additionally, you can have faith in how dependable this harness is because its manufacturer, Tekonsha, has a very strong reputation for creating quality wiring products. As such, this harness also...
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  • Trailer Wiring Recommendation for 2018 Toyota RAV4 Hybrid
    Yes, we do have trailer wiring that fits your 2018 Toyota RAV4 hybrid. For that I recommend the Tekonsha kit part # 118578 because it installs without requiring any hardwiring and because it has the most reliable converter box of all of the kits we offer. I attached an install video for this for you to check out as well.
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  • Trailer Wiring Harness Recommendation for 2017 Toyota RAV4 Plus Install Video
    For a trailer wiring harness confirmed as a fit for your 2017 Toyota RAV4 we have the Tekonsha kit part # 118578 which is a confirmed fit. I attached an install video down below that shows this kit installed on a similar 2017 RAV4 as your as well.
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  • Recommended Trailer Wiring Harness for 2017 Toyota RAV4
    It sounds like you might be looking for a trailer wiring harness for your 2017 Toyota RAV4. For this, I recommend the Tekonsha T-One Vehicle Wiring Harness # 118578. This harness is custom-fit for your RAV4 and will connect directly to the built-in ports behind the trim panels in the cargo area of your vehicle. Once installed, this will give you a 4-Way connector at the rear of the RAV4 to connect with and power your trailer's signal lights. I have attached the written installation details...
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  • Routing Power Wire for Trailer Wiring Harness on a 2014 Toyota Avalon
    Trailer wiring harness # 118578 fits the Toyota Avalon and the RAV4 which is why you see a video for the RAV4. We haven't had the chance to install it on the Avalon. The portion of the video showing the actual routing of the power wire is not specific to that vehicle. You can definitely use it as a guide on your Avalon. I have also included a link to the right that includes tips on routing the power wire. Manufacturers of the wiring harnesses do not address how to get the power wire...
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  • Does the Power Wire of the Tow Ready 4-Way Harness # 118578 Have to Run to Vehicle Battery
    If you were to run the power wire of the Tow Ready Custom Fit Vehicle Wiring # 118578 to anywhere but the positive post of your vehicle battery you would void the warranty of the harness and could potentially damage the wiring of your RAV4 in the event of a short on the trailer wiring. The purpose of the battery wire being run to the battery is so that it bypasses the delicate vehicle wiring and eliminates the potential threat of the trailer wiring damaging the vehicle's wiring. It draws...
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  • Does Battery Need to be Disconnected to Install Tow Ready Trailer Wiring on a 2015 Toyota RAV4
    Step 11 of the trailer wiring harness part # 118578 that you referenced indicates that you have to disconnect the negative post of your vehicle's battery temporarily. You would lose some radio presets doing this but nothing permanent would get damaged. On the other hand, if you were to leave the battery connected there is a chance you COULD damage the electric system or get shocked yourself. I attached an install video for you to check out as well.
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  • Where to Connect Power Wire of Tow Ready 118578 Trailer Wiring Harness on 2016 Toyota RAV4 Hybrid
    The terminal you have the power wire connected to looks like it's a fused terminal. I'd recommend connecting to the bolt that's closest to the positive battery post as shown in the photo I've edited for you. This will provide you with a direct connection to the battery. Tow Ready confirms that the # 118578 is compatible with your 2016 Toyota RAV4 Hybrid.
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    Image 1 for
  • 2016 RAV4 Hybrid Trailer Wiring Harness Fit
    Tow Ready has confirmed for us that their trailer wiring harness # 118578 will fit and would work well. I attached a picture that points out which terminal to use on the battery for running the power wier of the harness. I attached an install video for you to check out as well.
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    Image 1 for
  • Trailer Wiring Harness for a 2016 Toyota RAV4 with LED Tail Lights
    All you will need is the proper wiring harness for your 2016 Toyota RAV4 and it will work just fine with the vehicle's LED tail lights. Trailer wiring harness # 118578 is a great option. I have included a link to a video showing an example installation for you.
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  • Does Power Wire of Trailer Wiring for 2018 Toyota RAV4 Drain Battery When Not in Use
    Since the wire to the battery does not draw any amperage when the vehicle is off and a trailer is not connected it would not drain it. It's the same principle as the wiring of your vehicle that already runs to the battery. When those circuits aren't active it does not drain it at all.
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  • Can Power Wire of 2018 Toyota RAV4 Hybrid be Ran to Rear Battery
    Yes, when you install the Tekonsha trailer wiring kit part # 118578 on your 2018 Toyota RAV4 Hybrid you can run the power wire to the battery in the rear of the vehicle which would be easier than running to the front of the vehicle.
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  • Will the T-One Vehicle Wiring Harness 118578 Fit a 2018 Toyota RAV4 Hybrid
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118578 is a fit and an excellent option for Hybrid models of the 2018 Toyota RAV4. In regards to installation, this will actually be a bit easier since you don't have to run the power wire up to the engine as this is usually in the rear cargo bay instead.
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  • Fuse Blows on T-One Wiring Harness When Hooked Up to a Trailer
    This sounds like you may have a pinched wire. Look at the green, yellow, and brown wires that are ran through your vehicle and check for any areas where the wires are pinched and touching the metal of your vehicle. If they are, this will cause the wire to be grounded out, which in turn will cause them to short. Replace the fuses and test each function without the trailer hooked up. Use your right blinker to see if it's the green wire. Use your left blinker to see if it's the yellow wire....
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  • How Does Power Wire of Tekonsha Trailer Wiring Kit for 2014 Toyota Avalon Get Ran
    We had the chance to install the Tekonsha T-One kit part # 118578 on a 2014 Toyota Avalon and shot an install video that I attached to this page that covers the entire process. At the 10 minute mark roughly the video covers running the power wire to the battery that is in the vehicle trunk.
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  • Where Does T-One Wiring Harness Mount on 2017 Toyota RAV4
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118578 is designed to mount inside your 2017 Toyota RAV4's hatch, it will not mount to the outside. There is one grommet under the carpet where the spare tire is that allows you to connect the power wire to the module, but there is nothing that allows you to mount the 4-way anywhere outside your RAV4. If you have yet to install it, I have added a link below to a video install on a 2017 RAV4 for you of the T-One Vehicle...
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Condition: Like New

Notes: May have damaged packaging or minor cosmetic blemishes.

Our Price: $76.95
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