Price: $42.86

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

Item # 118545

lowest price pledge


Our Price: $42.86

Orders above $99 qualify for Free Shipping


In Stock
zoom in icon
zoom out icon
pop out icon replay 360 icon
horizontal rotate icon

Product Images

tekonsha custom fit vehicle wiring 4 flat t-one harness with 4-pole trailer connector
tekonsha custom fit vehicle wiring trailer hitch 4 flat t-one harness with 4-pole connector
tekonsha custom fit vehicle wiring powered converter 4 flat 118545

In Use/Installed

2010 nissan versa custom fit vehicle wiring tekonsha powered converter 118545
2010 nissan versa custom fit vehicle wiring tekonsha trailer hitch 4 flat t-one harness with 4-pole connector
2010 nissan versa custom fit vehicle wiring tekonsha trailer hitch 4 flat 118545
2010 nissan versa custom fit vehicle wiring tekonsha powered converter 4 flat in use
2010 nissan versa custom fit vehicle wiring tekonsha trailer hitch in use
2010 nissan versa custom fit vehicle wiring tekonsha powered converter 4 flat 118545


  • Custom Fit
  • Trailer Hitch Wiring
  • Tekonsha
  • 4 Flat
  • Powered Converter
The best technical support and full custom fit vehicle wiring installation instructions. Lowest price Versa custom fit vehicle wiring guarantee and expert service. Nissan Versa, 2012 custom fit vehicle wiring by Tekonsha are available from For expert service call 800-298-8924 to order your T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part number 118545, or order online at

2012 Nissan Versa - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Quickly and easily install a 4-way trailer connector on your Nissan Versa 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 Nissan Versa 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 Nissan Versa'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: 2.1 amps per circuit
    • Tail lights: 5.6 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your Nissan Versa'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 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 Nissan Versa'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 Nissan Versa operate.

With a ModuLite, your trailer's lights will be powered without overloading your Nissan Versa'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.

118545 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

118545 Installation InstructionsInstallation Details 118545 Installation instructions

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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Trailer Wiring Harness Installation - 2010 Nissan Versa

Today on our 2010 Nissan Versa, well be installing the Tow Ready T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part number 118545. Now when youre going to use your four-flat wiring, youll simply pull it out, keep it away from the center latch area. When you close the hatch, itll push in on the weather stripping. When you no longer need the four-flat wiring, you simply raise the hatch and lift up the rear storage area. You can store your four-flat wiring down near the spare tire.Were going to begin here by raising the rear hatch of the vehicle. Well then need to remove the center covering section here, as well as this section right here.

Well go ahead and take this piece out as well. Next, were going to need to remove the center threshold piece here. Now before you can pull upward, there should actually be two tabs, one here and one here. Theyre just push fasteners, but theyre actually not in on this particular vehicle so we wont need to remove them. Next, were going to need to remove some interior fasteners.

There are several of them that well need to remove in or order to peel this interior piece back enough to gain access to our tail light wiring on both sides.Either a trim panel removal tool or a large flat head screwdriver will help you get the push fasteners out. Right there is what the little tabs look like. Right here is our connector. Right there is the little locking tab that youll need to push in, in order to pull the factory connector apart. If you just take a small flat head screwdriver like this and gently push in on the locking tab and twist just a little bit, itll allow it to come apart so to look something like that.

Next, were going to go ahead, were going to peel back our white wire with the ring terminal on it. Its the ground stud. That way, it gives us more options of where were going to mount it.Well then go ahead and take our brown and yellow wire with the two connectors on it. Well tie it in with our factory harness that we just disconnected. Go ahead and match it up, push them together, making sure that we hear them fully click so that we know that theyre engaged.

Do the same with the other half. Now, well go ahead and repeat the same process over here on the passenger's side, but this time, well be using the green and the red wire T connection. Lets go ahead and route our other T connector over here in the passenger's side where well make our connection.Next, were going to need to poke a hole in this grommet right here and then well go underneath the vehicle that well route our black power wire back through. That way, we only have to pull the necessary wire back into the vehicle. Were going to be trying in with this red wire here on the converter box and then that wire will ultimately run up to the positive side of the battery. Go ahead and reach in and poke a hole here in our grommet. Now that weve put a hole in grommet, well go ahead and pull our tool back out. Well then take our wire and push it in through the hole. Go ahead and take the extra wire here, feed it dont behind the bumper cover and then pull it out. Then get our grommet back into the body.Next, were going to need to strip a little bit of wire back from the black wire here. Go ahead then and add our yellow butt connector on. Go ahead and strip back a little more here on our red wire. Then go ahead and connect it in with our yellow butt connector. Go ahead and tape up our connection then. Next, were going to go ahead and take a paper towel with a little bit of alcohol on it to clean our surface where well be attaching our converter box using a two-sided tape. Next, well need to peel the back off of the two-sided tape on the back side of the converter box. Well go ahead and push our converter box down.Were then going to need to take our white wire with the ring terminal on it. Well need to ground that to a portion of the vehicles body. Now that weve got our ground screw in, we can go ahead and get our wires work back in here behind the piece of trim. Go ahead and put our interior panel back in the reverse order that we removed it. Now, well go ahead, youll notice that we have a little extra green and red wire. Well just go ahead and use a zip tie to help kind of secure it up. Trim off the excess and then we can put our center piece back in place as well. Go ahead and put the rest of our interior pieces back in as well.Now that we have our interior back together, next well go ahead and route our power wire, which is the black wire. Now, when routing the wire, you want to make sure that you stay away from areas that may move, become hot or have sharp edges because all of these could easily damage the wire. Well also be using several zip ties along the way to help secure the wire. Now, weve gone ahead and routed our wire underneath the vehicle and up into the engine compartment. Well go ahead and snip off our zip ties along the way. It comes up, it goes up and over the top of the gas tank and weve secured it to some of the lines here as it runs up to the front.Now that weve got our wire routed up near the battery, go ahead and take our fuse holder, cut it in half. Strip back some wire from both ends. Do the same thing to the end of our black wire. We can go ahead and add our yellow butt connector here to the black wire. Then go one-half of our fuse holder into the other half of the yellow butt connector. Well then add a ring terminal to the other end of our fuse holder. Well then need to go ahead and tape up our connection there. Now, before we hook our ring terminal to the positive side, you want to make sure that the fuse has already been removed and that there is no fuse in the fuse holder.We can go ahead and get a socket. Well loosen up the connection there. Now, since the nut wont come all the way off of that stud, I'm going to go ahead and cut the center out of our ring terminal so it slides over the stud. Itll look something like that. We can go ahead and add our 10 amp fuse to the fuse holder. Put the cover on it. Go ahead and use a zip tie to help secure any excess over here. Go ahead and trim off any excess. Now, were ready to test out our four-flat. Now, well go ahead and take our test light. Well connect the ground on the test light to the open prong on the four-flat. With our running is on, well touch the brown wire. Left turn, well touch the yellow wire. Right turn, well touch the green wire and brakes, well touch the green and the yellow. As you can see here, all of our functions are working properly.Thatll do it for the installation of the Tow Ready T-One Vehicle Wiring Harness, part number 118545 on our 2010 Nissan Versa. .

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118545

Average Customer Rating:  5.0 out of 5 stars   (8 Customer Reviews)

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

- 118545

by: Beck09/16/2017

Bought this with the hopes of being able to figure it out. When I did complete the project not only was it way easier than I expected, and the folks at etrailer had already made a video showing me exactly how to do all the steps and in what order. The harnesses were perfect for my car and easy to tie into the current lighting. I have recommended this company to many of my friends because they're always so surprised at how well my versa pulls a trailer. Excellent product, excellent customer service, and excellent instructions on how to compete the job! Thanks again to everyone at etrailer!! 433070

- 118545

by: Ted S.03/12/2017

I ordered a complete kit (Curt trailer hitch) from etrailer. The kit arrived earlier than the promised date. Part of the ball (nut, lock washer) for the hitch was missing. When I called, a second complete ball was sent out immediately, no charge. Katie D. took care of this. I am very pleased. 355641

- 118545

by: Gary S10/13/2014

Quality product, timely delivery. As other reviewers have noted, they don't seem to have figured out how to box up a trailer hitch so that it doesn't destroy its packaging in shipment, but it all made it. 155680

- 118545

by: jonnydabney03/13/2015

the product I ordered, works fine, and easily installed, really like the product. everything fit fine and works fine. fast delivery also. good price also. 178198

- 118545

by: Orlando02/17/2015

Works as described, super easy install. The install video extremely helpful! 175127

- 118545

by: John S04/16/2013

Everything was just like advertised, Good product. 76379

- 118545

by: Christopher10/31/2017

Product was easy to install, and worked great 447706

- 118545

by: Anthony E03/14/2013

Easy installation. Fast shipping 70754


Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring
Do you have a question about this Custom Fit Vehicle Wiring?

  • How to Determine Installation Cost to Install a Trailer Hitch on a 2009 Nissan Versa
  • If you are talking about the actual cost of the trailer hitch then that depends on the hitch. The most cost effective hitch we carry for your 2009 Nissan Versa is Draw-Tite trailer hitch # 24798. If you are going to have the hitch professionally installed then you are looking at anywhere from 1/2 hour to an hour labor charge. You would need to call around to get the going rate for labor in your area. I have included a link to the installation instructions for you to view. You can also see...
    view full answer...

  • Will Draw-Tite Trailer Hitch # 24798 Fit a 2012 Nissan Versa Hatchback
  • Yes, the Draw-Tite trailer hitch # 24798 will fit the 2012 Nissan Versa Hatchback. I have included a link to the installation details for you to view. If your daughter plans on doing some towing, the correct ball mount is # 3593 and you can use pin and clip # PC2. For a 1-7/8 inch diameter ball, use # 19256, and for a 2 inch diameter ball use # 19258. For trailer wiring use # 118545.
    view full answer...

  • Comparing and Contrasting Hidden Hitch and Curt Trailer Hitches for a 2008 Nissan Versa
  • Both the Draw-Tite, # 24798, and the Curt Hitch, # 11348, are Class I hitches rated at 200 pounds tongue weight capacity and 2,000 pounds gross trailer weight. They both have 1-1/4 inch receivers and install in the same way. The Curt hitch can be purchased with the correct ball mount, # C113483. I have included links to the installation details for each below. The Curt Hitch does require the use of a stabilization strap, # 18050, for use with any non-trailer load such as a bike rack...
    view full answer...

  • Estimated Installation Time of Curt Trailer Hitch # 11348 On a 2011 Nissan Versa
  • The estimated installation time for the Curt Trailer Hitch Receiver with Drawbar, part # 11348, is 30 minutes for a professional and 60 minutes for a Novice. Since you are an experienced mechanic, I would say it should not take you longer than 45 minutes tops to install. The Curt Hitch # 11348 Includes a Drawbar, Pin and Clip. To complete your towing setup, you may be interested in the following items: Vehicle Wiring, part # 118545 1-7/8 Inch Hitch Ball, part # 19256 2 Inch Hitch...
    view full answer...

  • Routing Trailer Wiring Harness Power Wire on a 2012 Nissan Versa Hatchback
  • There are a few different ways that you can route the power wiring for wiring harness # 118545 on your 2012 Nissan Versa hatchback. It all depends on how you want to route it. The 3 basic methods are under the vehicle exposed, under the vehicle semi-exposed, and through the interior of the vehicle. I wrote a help article, linked to the right, that covers the different methods that you can look through. The actual installation instructions, also linked to the right, do not offer detailed...
    view full answer...

  • Recommended Way to Tow an Electric Wheelchair with a 2012 Nissan Versa Hatchback or Sedan
  • Whether your customer has a Sedan or Hatchback, his maximum tongue weight is 200 pounds. Based on the wheelchair carrier weighing 90 pounds and the power wheelchair at 200 pounds Draw-Tite trailer hitch part # 24798 will not work with the 2012 Nissan Versa. The reason is the tongue weight maximum capacity is 200 pounds and Class I hitches often lack the capacity to carry an electric wheelchair. The hitch mounted accessory does not lack the capacity, it is the vehicle. In your situation...
    view full answer...

  • Trailer Wiring Harness for a 2008 Nissan Versa Hatchback
  • For your 2008 Nissan Versa Hatchback you can use Tow Ready wiring harness, # 118545. It is listed as a fit for the hatchback models. I have included a link to the installation instructions for you.
    view full answer...

  • Trailer Hitch and Hitch Ball Recommendation for 2008 Nissan Versa
  • You can tow a small trailer with a 1-7/8 inch hitch ball coupler with the trailer hitch part # 24798 that you referenced. It would be just a matter of using the correct hitch ball size with the ball mount # 3593 that is recommended for this hitch. For the ball you would need # 19256. For trailer wiring you would need the part # 118545 which is a custom fit kit for your 2008 Nissan Versa. You will need to consult the owners manual of the vehicle to determine the towing capacities....
    view full answer...

  • Compatibility of Curt Class I Hitch on 2010 Nissan Versa with Mobility Scooter Carrier
  • A Class I hitch, including the Curt # C11348 that would fit on your 2010 Nissan Versa has a relatively low tongue weight capacity of 200 lbs. The tongue weight capacity represents the maximum amount of weight that can be safely hung from the hitch. This means that your Harmar AL 160 Profile Scooter Lift plus the weight of the scooter itself could weigh no more than 200 lbs. Exceeding that weight limit could cause the hitch to bend or the hitch attachments to the vehicle to fail, which...
    view full answer...

  • Does the Draw-Tite # 24798 Come with Everything Needed to Install on a 2012 Nissan Versa
  • I checked the install instructions and there is nothing that the Draw-Tite # 24798 you referenced does not include to allow it to be installed. Everything you need to install this hitch is included. For trailer wiring you would need the part # 118545. The hitch does not come with a ball mount. For a ball you would want part # 19256 for a 1-7/8 inch ball or part # 19258 for a 2 inch ball.
    view full answer...

  • Custom Fit Vehicle Wiring Harness for 2001 Nissan Versa Sedan
  • Yes, the T-One Vehicle Wiring Harness, # 118545, will fit your 2011 Nissan Versa sedan. The T-One connector plugs directly into your vehicle's existing wiring and includes a powered module which connects directly to the vehicle's battery to avoid overloading the Versa's electrical system.
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?

  • Why

    At we guarantee:

  • Highest quality custom fit vehicle 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 custom fit vehicle 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

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

Info for this part was:

Photos by:
Theodore B
Expert Research:
Michael H
Updated by:
Laura H
Test Fit:
Shane T
Video by:
Alan C
Updated by:
Sarah W

At 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. Let us know if anything is missing or if you have any questions.

About Us
photos and videos

Original Photos & Videos

Produced to make sure you know what you are getting and you get exactly what you need.


Installations Completed

To make sure products work and fit the way they are supposed to.

etrailer call center

Phone Calls & Emails Answered

1,125,924 phone calls and 1,350,587 emails to help find the right solution.

etrailer training

Average Hours of Product Training

We get to know our products firsthand so experts can better help you.

etrailer service

Years of Quality Customer Service

Assisting our neighbors and customers, face to face at the counter.

etrailer experts

Pages of Expert Information

Created to make sure you have all the answers to your questions, from real experts.