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

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

Item # 118405
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Retail:$93.80
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118405 - Powered Converter - Tekonsha
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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. Powered ModuLite reduces strain on wiring system. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118405 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.
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118405

  • 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. 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
    • Locate connection points in rear cargo area
    • 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


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 inside your trunk or cargo space, 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 this 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 within your trunk or rear cargo area.


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.



118405 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118405 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 - 118405

Average Customer Rating:  4.7 out of 5 stars   (187 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.

by:
2017 Mazda 3

I have a 2017 Mazda 3. I ordered the product because I was hesitant about splicing into my car’s wires. This wiring harness made things a lot easier. I watched a YouTube video to get a quick idea of how to do it. The only thing I did different was I ran the wire which connects to the battery through the inside of my car. The wire runs from the trunk, easily squeezed between the rear seat, tucked into the floor panels by the doors, goes up near the driver side, through a small pre-existing gap in the body and to the battery. No drilling though the firewall, no need to go beneath the car. See photos for reference.


Comments
Still works great. Got exactly what I paid for. Extremely satisfied!
Christopher - 11/28/2021


by:

Trailer hitch / draw bar = Excellent design and installation.
Wiring harness received, not yet installed. Comment to follow. rw




by:

It worked, but I had to add more wiring to my install as I did not order the right harness to begin with. My fault of course, not the fault of the harness. I was told this was the harness I needed. The information was not correct.




by:

Hitch installed easily on my 2014 Toyota Corolla.
Wiring had poor instructions in the box but the video posted on etrailer’s site answered my questions.
No issues and everything worked.
Thanks.




by:
Toyota Corolla

The hardest part of the install was not having a lift. I barely fit under the Corolla making difficult to run the wire. Other than that super easy! Will probably want a few extra zip ties. Good quaint, easy install, and it's holding up well




by:

The wiring harness was exactly as described and installed easily. Quality product.




by:
Mazda Protege5

My second hitch purchased from etrailer for a Mazda hatchback (first '02 Protege5, now '15 Mazda3). Both good experiences.

Very easy hitch install, the inclusion of the fish wires for the frame hanger bolts is a stroke of genius. Don't be afraid of the exhaust isolators, just spray some soapy water and support muffler with a jack or strap. If you can change a flat tire then you can work a wrench well enough to do this in an hour.

'14-15 Mazda3 has a couple of things making wiring easy to integrate. There's a grommet in the left rear quarter floor that's perfectly placed. Just trim some electrical tape to allow an opening, clip the new connector near the lighting adapter & reconnect inside after fishing from outside. I ran power neatly along driver's side rocker & out through the firewall. It's both easier and less vulnerable, just fish one more wire through the mass that exits above the driver's left foot. (Just DO NOT use anything sharp, you don't want to nick any wires and short something out). Finally the battery on my car already had several open connections to use right at the positive terminal, each protected by a fusible link no less! (See photo.) All I needed to add was an M6 stainless nut to connect the new wire.

Only a couple of minor downsides:

Aesthetically this is one of the uglier installs, mostly because the 3's huge muffler is right against the rear valence, leaving no room to tuck anything out of sight. My Protege5's hitch was entirely hidden except for the receiver. Here, unless you're willing to butcher your bumper cover (assuming there's a hitch made to fit that way) you're stuck with what you see in my picture. I saw the round-tube alternative on another similar car and it looked a little better, but that one requires support straps for a rack with any carrying capacity.

Design-wise I ran into one surprisingly annoying thing the first time I went to insert my drawbar. The hole in the receiver for the hitch pin is set really close to the hitch frame, and there's a gusset plate on top, which leaves basically no room for the clip that secures the pin. My existing clip didn't fit at all until I ground the ends a little. The clip that came with the new hitch sort of fit, but only jammed up against the hitch so hard that it scratched right through the protective powder coat. Weird in a product from such an experienced manufacturer, but easy to rectify.




by:

E-trailer is as simple as it gets and their support team is extremely helpful. I purchased a trailer hitch and wiring harness about a year ago, and it was super simple to install I have no complaints and would definitely purchase another!




by:
2014 Mazda 3

Couldn’t be happier, shipped quickly and installed without a hitch no pun intended.!




by:

The wiring harness worked just fine. It is a very doable task to just plug and play the wires into the back of the tail light assembly and pull the wires out of the truck every time you need to haul something with with lights.

However to do a professional style install...aka...removing interior, running wires underneath the carpet, lubing the wires up, forcing them through the grommet in the rear quarter panel and then running the power cable up to the battery (which means having to take off the plastic shields and the clips holding them.)
I would still recommend, but you will learn a lot about how well your car has been assembled.




by:
2017 Toyota Camry

All equipment was delivered on time. Hitch, wiring harness, receiver and ball. Watched video's on installation of harness and hitch. Went down to my garage and installed both with the help of my girlfriend. Very satisfied with the products and the installation. etrailer supplied the goods and the knowledge. I am very happy that I went this route.




by:

A great experience. Quality product. Looks good on the vehicle.Could recommend it to anyone.




by:

Easy to do. Took about an hour plus as I didn’t have it jacked up and I was squeezing underneath to string the wire up to the battery. Other than that easy to do and understand.




by:
Mazda

This wiring kit was purchased for installation on a 2017 Mazda 3 sedan.

As received, the installation instructions made no reference to any Mazda 3. There was reference to a Mazda 6 with incomplete instructions and pictures. The company web site offered no further clarification.

I am an automotive engineer with an electrical background and the installation was far from obvious. Wire color codes did not match the car harness. The power wire to be routed to the battery was black. Vehicle power is usually red. The fuse holder and its wiring to be atttached to battery plus was yellow. The power wire leading into the control module was red. So, we have a yellow wire connected to a black wire, connected to a red wire. What a mish-mash!

I finally called the manufacturer and spoke with a customer service representative. He was not able to help immediately but took time to find the right information and called back.

Once the install information was received, the installation went reasonably well with the most difficult part being the routing of the power wire forward to the battery. To protect the wire and install it securely, I removed the plastic undertrays and routed the wire alongside some fuel or hydraulic lines. As mentioned by other users, more ty-wraps would have been useful. I used some from my existing supply.

After install, I tested the function with the boat trailer and it appears to work as designed.




by:

Easy peasy. The longest part was running the wire to the battery.




by:
2015 Mazda 3

The kit is good quality. As others have stated, the instructions are useless. I was installing in a 2015 Mazda 3. The video that etrailer has for my vehicle was good, but he did the full install on the exterior of the vehicle (including the box). This requires routing the wires up through the taillight gasket gasket, which is definitely not ideal. Not only could this allow water ingress, but it makes getting the lights to tighten down and light up the panel gaps a nightmare. I mounted mine in the trunk and found a grommet for the power wire to exit through on the drivers side. This also requires a lot less crawling around below the car. Now the entire system, besides the power wire, is inside the car. Routing the power wire is a nightmare, but it would be on any car and is certainly not the fault of this kit. Everything in the back took about 30 minutes. Routing the power wire took 2 hours without a lift.




by:
Toyota FJ Cruiser

The wiring harness was delivered to my front door within two business days. I installed the harness in my FJ and it works perfectly. You will need two tools to complete the job, they cost me $40. bucks but the net cost was still well below a dealer install. You will need long needle nose pliers, I bought 8 inchers. Also, you will need a tool to pop out the retaining fasteners on the trim; if you try to use a screwdriver you will most certainly break the fasteners. You will also need a wire stripper tool to complete the job. I am not the sharpest knife in the drawer so the job took about 2 hours to install and reassemble the trim. I would recommend this product to anyone who can read and follow directions. Thanks much to etrailer for a great value and fine product.




by:
2017 Toyota Corolla

I ordered the wiring kit and after receiving it I realized that on the box it would fit up to a 2016 Toyota Corolla. Mine was a 2017 so I decided to go ahead with the install. When I got to the installations instructions my Corolla was not listed anywhere. It only listed the Toyota FJ Cruiser, Mazda 6 Sedan, Mazda CX-7 and Toyota Camry. I have installed several wiring kits in the past so I decided to try it without the instructions. I was able to do so by using the Camry instructions but it would have been accomplished faster had the correct instructions been in the box. I also wonder how easy it would have been for a first time installer ?

I rated it with one star due to the incorrect instructions but would give it a 5 star rating for the quality of the wiring harness.




by:

Installed as advertised, fit as advertised and looks like it was custom built for the car (2015 Camry). A very good looking hitch assembly that blends in beautifully and looks like it belongs there. Installation videos are a real time and effort saver. The hitch receiver is a slightly loose for my taste but otherwise I am extremely pleased with it.




by:
2014 Toyota Camry

Great product. This is my fourth one from etrailer. A bit more difficult to install. Had to think up some way to hold it up singlehandedly, but managed it. See attached picture.
Will deal again with you in a flash.




by:

Easy install, no problems.




by:
2011 Toyota FJ Cruiser

So I’m a woman and I could install this, so it’s that easy to follow. Needless to say my husband was a bit impressed. I won’t lie the wire connectors were a bit hard to clamp and connect but otherwise everything was super easy to install and works great!


Comments
Still works fantastically, I haven’t used my trailer much during the winter, however during the fall it was still holding up quite well. I still highly recommend this product!
Katelyn - 04/05/2021


by:

Solid hitch excellent ty




by:

Incredibly easy process. If you have a few tools and 15 minutes, you can do it too. The company also makes videos to walk you through it so there should be no problem at all.




by:

Easiest install I have ever done!



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Show More Reviews

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



  • No Running Light Power After Installing Trailer Wiring on a 2009 Toyota Camry
    It looks like the brake light and running light wires on harness # 118405 plug into the same location on a 2009 Toyota Camry. Check the converter wiring going into the converter to see if power is at that point since it is already at the tail light. If it is not on the brown wire going into the converter then check the connectors for bent or broken pins. If they you find a broken pin that harness will need to be replaced. A bent pin could be very carefully bent back. Make sure that the...
    view full answer...
  • Where are the 2008 Toyota FJ Cruiser Connection Points for Trailer Wiring, # 118405
    On the 2008 FJ Cruiser, the access points are going to be behind the taillights. The drivers side is the easiest. There is a small panel in the cargo area that you will remove and the taillight assembly will be right behind it. The passenger side requires loosening the trim panels on the passenger side cargo area to gain access to the taillight assembly. If your FJ Cruiser has the optional sub-woofer, it will need to be temporarily removed to gain access to the passenger side taillight...
    view full answer...
  • How To Tell If Lights On 2015 Mazda 3 Are LED Or Incandescent
    You can find out if you have LEDs a couple of ways. The easiest is to remove the lens of the lights and if it has a bulb it is incandescent. If it has diodes then it is LED. Another way is to turn the lights on and then watch as you turn them off. If the light go off abruptly, they are probably LED. If the filament takes a moment to go out then it is probably a bulb. The third way is to contact your dealer with the VIN and they will be able to tell you what lights are on your Mazda 3.
    view full answer...
  • 2012 FJ Cruiser 4-Way Trailer Wiring Recommendation
    For 4-way trailer wiring for your 2012 Toyota FJ Cruiser you would want the part # 118405 that has been confirmed as a fit for your vehicle. The wiring harness you found could be for trailer wiring but it is not a style of connection that we sell a harness for. There might be a Toyota option that you could get through a dealer. The part # 118405 installs inline with the taillight assemblies of your vehicle to provide the 4-way signal. I attached an install video for you to check out.
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    Image 1 for
  • Where Are Vehicle Connectors For Trailer Harness Wiring On 2014 Mazda 3 Sedan
    The connection points for the T-Connector Wiring Harness, part # 118405 are located behind the driver and passenger side tail lights - inside trunk. The 4-way trailer connector will hang out of the trunk area on your Mazda when you need to use it. When it is not being used you can place it inside the truck and possibly under the carpet in the trunk. It will not affect the vehicle's lights if installed correctly.
    view full answer...
  • Trailer Wiring Harness Recommendation for 2014 Mazda 3
    The good news is that the trailer wiring harness part # 118405 fits your 2014 Mazda 3 whether it has LEDs or does not so it would work well for you either way. It also fits sedans or hatchbacks too. LED taillights are a bit different than incandescent bulbs. For me, if they are obnoxiously bright and almost hurt your eyes to look at they're LEDs...haha. The other more reliable way to tell is to look at the transition of the lights from off to on. If they lights seemingly warm up as they...
    view full answer...
  • Recommended Trailer Wiring Harness for 2006 Mazdaspeed 6 Sedan
    Yes, the Tekonsha T-One Vehicle Wiring Harness # 118405 referenced in your question is confirmed to fit both the 2006 Mazda 6 and the Mazdaspeed 6 Sedan. I confirmed this with my contact at Tekonsha. This custom-fit harness will install by connecting directly to the built-in ports behind the driver and passenger side tail lights (inside the trunk). You will then need to run the hot lead up to the vehicle's battery. I have attached the complete installation instructions that you can also...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2014 Mazda 3 Hatchback
    For your 2014 Mazda 3 Hatchback without LED taillights the Tekonsha wiring kit part # 118405 would be the correct we recommend. I attached a link to an install video that shows the harness installed on a similar Mazda vehicle as well as a link to the install instructions for you to check out as well.
    view full answer...
  • Trailer Wiring Fit Recommendation for 2017 Toyota Camry
    For trailer wiring confirmed as a fit for your 2017 Toyota Camry you would want the Tekonsha kit part # 118405. We do carry this and it will work well.
    view full answer...
  • Recommended Trailer Wiring Harness for 2018 Mazda 3 with LED Lights
    For your 2018 Mazda 3 Sedan with LED lights, I recommend the Tekonsha T-One Vehicle Wiring Harness # 118405. This custom harness is confirmed to fit your vehicle and will install by connecting directly to existing ports located behind the driver and passenger side tail lights (inside the trunk). Once these connections are made, you will just need to run the hot lead up to the Mazda's battery. This will provide you with a 4-Way connector to connect with and power a trailer's basic signal...
    view full answer...
  • Recommended Trailer Wiring Harness for 2019 Toyota Corolla Sedan
    For your 2019 Toyota Corolla I highly recommend the Tekonsha T-One Vehicle Wiring Harness # 118405. We have found over the years that Tekonsha's powered converter modules are extremely reliable and hold up much better over time than those from other manufacturers. This particular harness will plug right into existing ports behind the tail lights on your Corolla and it includes the hot lead that needs to be run up to the battery. This will provide you with a 4-Way connector to connect...
    view full answer...
  • Trailer Wiring for 2016 Mazda 3 that Fits Sedan/Hatchback with or Without LED Lights
    I have an easier solution for you, but at this time Curt does not list any of their trailer wiring kits for the 2013 Mazda 3 as a fit if the vehicle has LED taillights. Instead we have the Tekonsha kit part # 118405 which fits all versions of the 2016 model including with or without LED lights and hatchback or sedan. Plus the Tekonsha kits have a reputation as having the most reliable converter boxes so we recommend them highly. I attached an install video for more info for you to check...
    view full answer...
  • Recommended 4-Way Wiring Harness Converter For 2013 Toyota Camry and Trailer Circuit Troubleshooting
    I recommend changing to the Tekonsha T-One Vehicle Wiring Harness # 118405 on your 2013 Toyota Camry Hybrid. In my experience the Tekonsha harness has proven to be a more reputable convertor for vehicles. In speaking to one of our technicians who installs these devices on a regular basis, the most important part of the installation is securing the wiring and converter so that the wires do not pull out of the converter box. Tekonsha understands this by giving you a mounting hole in the converter...
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  • What is Needed to Install a 4 Way Flat Wiring Harness on a 2014 Toyota Camry
    What you are needing is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118405. This will provide you with a 4-way flat trailer connector at the back of your 2014 Toyota Camry to power your trailer's signal lights. This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located inside your trunk or cargo space, 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...
    view full answer...
  • Will Tekonsha 118405 Wiring Harness Fit 2015 Mazda 3 Hatchback
    According to Tekonsha, this wiring harness fits the 2014-2018 Mazda 3 Hatchback. So yes, you can use the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118405 on your 2015 Mazda 3 Hatchback. This wiring harness will plug directly into existing wiring so no cutting or splicing is required. Once installed you will have a 4-way connection to power your trailer's signal lights. I have attached an installation video for your reference.
    view full answer...
  • Trailer Hitch Recommendation for 2007 Toyota Camry LE
    The hitch I recommend is the Draw-Tite Trailer Hitch # 36416. It is a good fit for your car with a 1-1/4-inch receiver, a weight capacity of 3500 lbs and a tongue weight of 300 lbs. It comes with a complete hardware kit and requires no welding during installation. You will want to check the towing and tongue weight capacity of your vehicle prior to using any trailer hitch. If the weight capacities between the vehicle and hitch are different, always use the lower of the two. I have provided...
    view full answer...
  • Correct Wiring Harness for 2010 Mazda CX-7 Without Tow Package
    According to one of our friends at Tow Ready, although your CX-7 has the port on the passenger side, using part # 118249 would not provide all the lighting necessary for your trailer. Not all of the wiring connections were made. For your CX-7, part # 118405 would be the correct wiring harness to use. The T-1 would connect inline with the existing wiring behind each tail light assembly. A wire also needs to be ran under the vehicle to the engine compartment ultimately connecting to the...
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  • Trailer Harness Wiring Harness Recommendations for a 2011 Mazda CX-7
    The determining factor for which trailer wiring harness you need is whether or not your vehicle has the towing package. If you do not know if your vehicle has a tow package or not you would need to contact the dealer with the VIN and they could tell you. Another way to tell is to locate the connector that mates with the # 118249 harness and use a circuit tester to test each wire function. If all functions work, left and right stop and turn signals and tail light signals, then the vehicle...
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  • Trailer Hitch and Wiring for a 2008 FJ Cruiser
    The vehicle wiring harness is sold separately from the hitch. For your 2008 FJ Cruiser, you will need the Draw-Tite Class III Trailer Hitch Receiver, item # 75461, and the T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, item # 118405.
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  • Will Draw-Tite Trailer Hitch 24814 From 2012 Toyota Corolla Fit 2016 Corolla
    I was able to look up your trailer hitch order from etrailer.com for your 2012 Toyota Corolla and found that the hitch you purchased is the Draw-Tite Sportframe Class I Trailer Hitch Receiver 24814. While some of the hitches from the 2012 Corolla are fits for the 2016 model, unfortunately the 24814 trailer hitch is not confirmed to fit the 2016 Toyota Corolla. For your 2016 Corolla, I recommend the Draw-Tite Sportframe Class I Trailer Hitch Receiver # 24913. I like this hitch because,...
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  • Recommended 4-Way Flat Connector for a 2014 Toyota FJ Cruiser
    I do have a solution for you to add a 4-Way Flat wiring connector to your 2014 Toyota FJ Cruiser but unfortunately the T-One Vehicle Wiring Harness # 118245 won't fit. Instead what you will need to use is one that tees in behind the tail light housing. I recommend the T-One # 118405 because we have found the Tekonsha wiring to be the most reliable. This tees in behind your tail lights and then draws power directly from your battery so as not to overload your wiring system. Attached is...
    view full answer...
  • Towing Capacity of 2007 Toyota FJ Cruiser
    Based on my research, it looks like the total weight of your 2010 LD Casita Trailer is between 2,200 and 2,500 pounds, depending on the specific model that you have. When looking at the online owner's manual for the 2007 Toyota FJ Cruiser, it shows a maximum trailer weight of 5,000 pounds. WIth these numbers in mind, you will have no issue towing your trailer if you decide to go with the FJ Cruiser. I do recommend verifying the capacity with your dealer or with your copy of the owner's...
    view full answer...
  • Towing Capacity and Parts Needed to Tow Trailer with 2007 Toyota FJ Cruiser
    Your 2007 Toyota FJ Cruiser has a towing capacity of 5,000 pounds and the 2016 Micro Minnie 2106FBS can weigh as much as 7,000 pounds when fully loaded so I can't recommend towing this with your vehicle. You will want to look for a camper that's a bit lighter and within the FJ Cruiser's limits. When you do choose an appropriate trailer you will need to add a trailer hitch, wiring harness, and ball mount/hitch ball combo to the vehicle in order to tow it. Starting with the hitch I recommend...
    view full answer...
    Image 1 for
  • Amperage of Fuse for 118405 T-One Wiring Harness
    The fuse that comes with the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118405 uses a 10 amp fuse. It's probably a good idea to bring the fuse holder along with you to make sure you can find a match when getting a spare. I have added links to a couple install videos as well as the instructions of Trailer Connector # 118405 for you to check out. I also highly recommend using Dielectric Grease for Electrical Connectors # 11755 to help prevent any type of corrosion...
    view full answer...


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