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  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118610
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Custom Fit Vehicle Wiring

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118610 - 4 Flat Tekonsha Custom Fit Vehicle Wiring
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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 - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system. Call 800-298-1624 to order Tekonsha custom fit vehicle wiring part number 118610 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (48)
  • Q & A (13)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118610

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

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 - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.


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)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points in rear cargo area
    • Plug in connector
  • 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


Specs:

  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 5.6 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located in your rear cargo area. You will need to remove some interior paneling to access this harness. Once you've plugged in the connector, insert the provided fuse into the in-line fuse holder.


It is recommended that you use a small amount of grease on all electrical connections - the plug 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.



118610 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118610 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118610

Average Customer Rating:  4.8 out of 5 stars   (48 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 - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.

- 118610
by:
2014 Toyota Prius v

Highly recommend. Rarely do I write reviews but both the trailer hitch & trailer light wiring harness installed perfectly. I wanted to take the time to let people know that this was a sincere review. I am not a mechanic nor an electrician but the instructions and YouTube videos made both installations a breeze. Plus I saved about $300 from the local "Rent haul" for installation. Thanks!



- 118610
by:
2013 Toyota Prius v

Purchase and customer service was exceptional. Even though I bought a SUV to tow and I am returning the product, the service and etrailer keeping me updated was exceptional. Would recommend etrailer to anyone and would not hesitate to order from etrailer again.



- 118610
by:
Toyota Prius

Service was outstanding, everything fit exact, and delivery on time. Most outstanding were the videos on how to install, spot on. Hitch took thirty minutes, wire harness forty-five This was on a Prius V. This will be used to pull a small boat , boat and trailer 600lb. Thanks for your outstanding help.



- 118610
by:
2013 Toyota Prius v

This is the 3rd hitch I have purchased from etrailer. All have been top notch and the installs all went very well. The wiring works great with my trailer. I'm very satisfied and intend to use etrailer again in the future.



- 118610
by:

Got this a year ago for my 2015 Prius V. and I nstalled it myself quite easily. I use it for a bike rack since the Prius is not designed to tow. Although I also towed an empty Ubox with it a short distance with no hills (this would have been bad for the car, not the hitch). Works great.



- 118610
by:
2017 Toyota Prius v

Works very well. Use care when removing plastic car panels. Video was very helpful. Suggest instructions be modified to have negative battery terminal removed earlier in process to avoid chance of a short.



- 118610
by:
2016 Toyota Prius v

Very easy and intuitive to install this trailer wiring harness. I had already watched the video, and am a retired industrial construction electrician. That might have made it easier, except about half of my install time was making sure I had the harness routed exactly as I thought best to keep it out of the way. My career may have made me a pick picky about that. As I continue to buy things from etrailer, they continue to please me with service and quality of product.


Comments
I use the wiring harness about once a week to tow my boat trailer, and it is still quite easy to stow away when not needed.
Vincent J - 05/13/2019



- 118610
by:

One of the simplest installs. Partially remove some plastic covers and install the T's in line. Replace the covers. Because the Prius has the battery in the back did not even need the included spool of heavy black wire that would normally be used for connections to batteries that are in the front of many vehicles. The only thing that I will changed is, that the yellow wire with the inline fuse was a little longer so that the fuse could be located in the spare tire well instead of the battery area to allow for easier access to the fuse. Other then that very happy with the wiring harness adapter and etrailer.



- 118610
by:

Easy installation with clear instructions in etrailer video.



- 118610
by:

Wiring harness arrived quickly. Between instructions that came with the harness and the online video linked from the etrailer description of the harness, I was able to successfully install the wiring harness in my car.



- 118610
by:
2012 Toyota Prius v

So this kit was great. No splicing factory harnesses and had it ready to go in what seemed like minutes. The thing is I bought this over a year ago and I can tell you how smooth it went now. I have kayak trailer that I pull with this, and wasn't too hip if I had to pull it at night without plugging in the lights. The cord tucks neatly into spare tire storage, so when not in use, it is nonexistent, but plugging it into the trailer is immediate. I just lay the cord flat in the seal and shut the tailgate. The picture looks complicated, but this is a very easy install. I think you will enjoy it without needed a soldering iron.



- 118610
by:

fit perfect. works great. videos are spot on. Thankyou expensive but worth it.



- 118610
by:
2013 Toyota Prius V

Thank you hitch & wiring was easy to install it tool about 1 hour.



- 118610
by:
2016 Toyota Prius v

The wiring harness was almost hassle free. The written instructions are clear, but the pictures are horrible. Small, dark, and impossible to correlate to the written directions. The “mechanical” parts of the harness are first rate. The HUGE let-down of the wiring harness directions is that there is ZERO mention of what to do with the pigtail that hooks up to the trailer. Nothing. Zip. Zero. Naaaadaaaaa! That would have been a seriously good bit of info to include, don’tcha think?


Comments
The 4-pin harness/connector is stored in the trunk/cargo area of the vehicle until needed. When you need to plug in a trailer, simply run the harness out the rear of the vehicle and gently close the rear hatch/trunk lid on the wire. The rear hatch of your vehicle has weatherstipping thats thick enough that the wire for the trailer connector wont be damaged as long as you avoid the latch area. The manufacturer specifically designed the harness in this manner so the connector would be deployed from the interior of the vehicle when needed. This way, the connector is protected from damage when its not being used.
-- Etrailer Expert Mike L - 06/06/2018


- 118610
by:
2010 Toyota Prius

I received the hitch for my Prius V about 5 days after ordering it and it was a simple matter to unbolt the brackets from the car for the towing eye and the back muffler hanger. then bolt the hitch in place using the longer bolts provided with the hitch. Installing the trailer light adapter was simple also once I figured out how to remove the interior body panels to be able to run the wires. Simply install the light adaptor between the existing plugs and the tail light connections. Note that when you disconnect the battery to make the final connections, your satellite radio connection will be lost and if you have set up blue tooth for your phone it will need to be re-connected. All the trip meter and mileage meters will reset to zero except the odometer for the total vehicle mileage. The satellite radio connection will reload after about 10 minutes when the battery is reconnected and the car is running. Overall I would say this is a very good choice it you want to use a bicycle rack or have a "small" utility trailer you want to be able to use for short runs. The car is not designed to tow trailers for any long distance but using it for short light runs should not hurt the car.



- 118610
by:
Toyota Prius

Hitch arrived with one end poking out of the box thanks to rough handling from UPS. It was well packaged and luckily the wiring harness I had ordered was stretch wrapped to the hitch so it didn't fall out of the open box. Only took about 20 minutes to install the hitch myself and another 20 minutes to install the custom wiring harness for the Prius V. Terrific instructions and on-line videos to support the process. Keep in mind I had an air compressor, air tools, and mechanical and wiring experience from working in a diesel shop in my youth. Terrific products and support, if you do need any help-just call and the etrailer staff is very knowledgeable and helpful. This is the second time I've bought a hitch from etrailer.



- 118610
by:

So easy! My 15 year old installed it himself in no time!



- 118610
by:
Toyota Prius

Wiring harness installed as reviewed, no wire cutting, no guessing, plugged in-line with the rear lights and attached to the rear battery of my Prius. Easy Breezy.


Comments
the harness continues to perform admirably, thank you for checking back
Larry D - 06/17/2016



- 118610
by:
2015 Toyota Prius

This hitch is very good. installation is a breeze. The only reason I'm not giving 5 stars is that I think it hangs down a little farther than it needs too. On a Prius v, there is 1-3/8 inch clearance between the hitch and the bottom of the bumper. In my opinion, it should tuck up closer. Other than that, it is perfect.



- 118610
by:
2012 Toyota Prius V

I installed the hitch by myself. It took about 45 minutes as I had a bit of trouble trying to thread the bolts near the muffler. I took a bucket that head the hitch up for me to then get the bolts in. You video was great. It took about an hour to install the wire harness #118610, just because I did not want to hurry the install, and damage any of the interior. Again, I followed each step along with your video. All worked well and the install looks nice and clean.



- 118610
by:

The installation took less than 20 minutes. Since I am familiar with removing the plastics...that does help. The kit appears to be well made with quality products. I like the fact it comes with a fuse and hope it will protect the electronics if there is a wiring short in a trailer. Always great service from etrailer and super pleased with my new hitch and wiring kit.



- 118610
by:
2013 Toyota Prius V

The trailer hitch installation went easily and the light electrical connections were simple. They have been just what what was needed for plenty recreational fun.



- 118610
by:
2014 Toyota Prius V

Wiring was very easy to install. Instructions were much more complicated than the actual installation. Once I read it all over and then actually looked at the vehicle, it was very easy to install. I did not need to remove the trim panels and just fished the wires under them to the tail lights and hooked everything up. Very easy!



- 118610
by:

With the battery in the back of the car and the online video this couldn't have been easier to install. No issues after about a year.



- 118610
by:
Toyota Prius

Everything looks good except the bar that goes into the hitch. It works fine in the down position but we discussed that it would be too low on my Prius. It has to be installed in the up position. Only it does not clear the car bumper in the up position. I am now awaiting my new longer bar that will clear the bumper. I am leaving on a trip in a week and need to pick up my new trailer in another city before I can pack the trailer for the trip. Also I am awaiting the prepaid address label so I can return the bar that does not fit.


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Trailer Running Lights Do Not Operate with TowReady 4-Pole Wiring Harness # 118610 in 2014 Prius V
    Thank you for your purchase last year of a TowReady wiring harness # 118610 for your 2014 Toyota Prius V. Also thanks for the troubleshooting details you included. Since the trailer lights work fine with another vehicle and your running light fuse on the Prius is okay it does sound like the harness, or the vehicle wiring leading to it, are the issue. The easiest way to check your harness is to test the brown running light wire on the input side (the wire that runs with the yellow) and...
    view full answer...
  • Converting 4-Way Flat on Toyota Prius to European Style 7-Way Connector
    I do have a solution for you, however we do not currently have an adapter available that will convert a 4-Way flat on your vehicle to a European 7-Way connector. In order to convert the 4-Way to a European style 7-Way, you will just need to do a little hardwiring. You will start with installing the Tekonsha T-One Vehicle Wiring Harness # 118610 referenced in your question, which is confirmed to fit your 2014 Toyota Prius V. This is custom-fit for your vehicle and will connect to the...
    view full answer...
    Image 1 for
  • Towing Capacity of a 2012 Toyota Prius V
    According to the owner's manual for your 2012 Toyota Prius V, "Toyota does not recommend towing a trailer with your vehicle. Toyota also does not recommend the installation of a tow hitch or the use of a tow hitch carrier for a wheelchair, scooter, bicycle, etc. Your vehicle is not designed for trailer towing or for the use of tow hitch mounted carriers." If you choose to do so anyway you will need a trailer hitch, wiring harness, and ball mount/hitch ball. For this, I recommend using...
    view full answer...
  • Hitch, Wiring & Related Items for 2012 Toyota Prius V
    We do have the items required to equip your 2012 Toyota Prius v to tow a trailer. These include a Class I hitch receiver, a ball mount, hitch ball and a wiring harness to operate the lights on the teardrop. The linked articles may be helpful. For a hitch I suggest the Draw-Tite # 24847 which offers no-drill installation as shown in the linked video. With it you can use ball mount # 3593 and either 1-7/8-inch ball # 19256 or 2-inch ball # 19258. Check the coupler on the trailer for the...
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  • Will Hitch and Wiring Harness from 2013 Prius V Fit on 2016 Prius V
    The same Class I trailer hitches that fit the 2013 Toyota Prius V also fit the 2016 model year. Those hitches are shown on the linked page, Curt # C11276 and Draw-Tite # 24847. You will need to replace your installation hardware since this is intended only for a single use. Hitch mounting hardware cannot be re-used to install the hitch on a new vehicle. We offer replacement hardware kit # RHK. Just click on the link for RHK and enter your hitch part number and manufacturer in the fields...
    view full answer...
  • 2016 Toyota Prius Four Touring Trailer Hitch Recommendation
    For your 2016 Toyota Prius Four Touring the Draw Tite hitch part # 24967 is the best option as it has mostly hidden appearance and the best ground clearance. The hitch would have capacity for a lightweight trailer and the install is very basic. I attached an install video for more info. Then for trailer wiring you'd want the part # 118610 which installs easily and is very reliable. Then for a ball mount you'd want the part # 3593 and for a hitch ball # 19256.
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  • Towing Recommendations with a Toyota Prius
    When I researched the weight of your Vespa LX50 it exceeds the Class 1 hitch tongue weight that would be compatible with a cargo carrier. An alternative would be to tow your Vespa behind your vehicle using a utility trailer. Although Toyota doesn't recommend towing with your vehicle, if you choose to do it anyway here is an option I can offer you since the recommended towing weight on the hitch is higher. I would recommend the Draw-Tite brand hitch # 24847 and drawbar # 3593. We...
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  • Hitch, Wiring and Hitch Bike Rack for 2014 Toyota Prius V
    We can help you with a light-duty 1-1/4-inch Class I hitch for your 2014 Toyota Prius V. I do recommend the Draw-Tite # 24847 since it has a lower price and the same capacity as the Curt option. An installation video is linked for you. For a 4-pole trailer wiring harness you can use Tow Ready kit # 118610; an installation video is linked for this item too. Before towing anything check your owner's manual for the car's rated towing capacity. In this hitch you can use a 2-bike Class I...
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  • Trailer Hitch and Wiring Recommendations for a 2017 Toyota Prius V
    The most popular trailer hitch for your 2017 Toyota Prius V is Draw-Tite hitch # 24847. This is a Class I trailer hitch with a 1-1/4 inch receiver rated for 200 pounds tongue weight and 2,000 pounds gross trailer weight. If your Prius is rated for towing then the capacity should be in the owner's manual. If lower than the hitch capacity go by the lower rating. The recommended ball mount for this hitch is # 3593. If your trailer takes a 1-7/8 inch ball use # 19256. If it takes a 2 inch...
    view full answer...
  • Trailer Hitch and Wiring Recommendation for 2017 Toyota Prius V
    For a trailer hitch for your 2017 Toyota Prius V the best choice is the Draw Tite part # 24847 as it is custom fit for your vehicle and has a great price. For trailer wiring you would want the part # 118610. For a ball mount you would want the part # 3593 which is designed for the hitch and then for a 2 inch hitch ball you would want the part # 19258.
    view full answer...
  • Trailer Hitch and Wiring for a 2014 Toyota Prius V
    I have to tell you first that Toyota states not to install a trailer hitch on the 2014 Toyota Prius V. It is stated in the owner's manual. If you choose to install a hitch and tow with the vehicle then trailer hitch # 24847 fits your Prius. The correct ball mount to use is # 3593. For a 1-7/8 inch ball use # 19257 and for a 2 inch use # 19258. And for trailer wiring use # 118610. I have included links to videos showing example installations of the hitch and wiring for you.
    view full answer...
  • Connecting Ignition Switched Power From 2015 Toyota Prius v to Enclosed Trailer
    You will need to use a circuit tester like # PTW2979 to find a wire in your 2015 Toyota Prius v that is hot only when you use your key (ignition switched power). When you do that you can simply wire in the Battery Isolation Solenoid # TR118665, which should be wired like in the accompanying diagram with 10 gauge wire # 10-1-1. I have added a link to a video review of the solenoid for you to check out.
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  • Recommendation for Transporting 2 Electric Bikes with a 2013 Prius V
    For your 2013 Prius V your only option is going to be to install a hitch and then tow a trailer to transport your electric bikes that you accurately described as, "heavy." For a hitch you could definitely go with the Curt Hitch part # C11276 that you referenced. For a trailer I would recommend the Yakima Rack and Roll Trailer part # Y08106. And then for bike racks to install on to the trailer I would recommend the Yakima FrontLoader Wheel Mount Bike Rack part # Y02103. For wiring...
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