1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 7 Blade
  6. Powered Converter
Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector

Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector

Item # 118290
lowest price pledge
Retail:$162.57
Our Price: $150.57
You Save: $12.00
Custom Fit Vehicle Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

This item qualifies for Free Shipping
Shipping Weight: 3 lbs
Quantity: 
In Stock
Tekonsha Trailer Hitch Wiring - 118290
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

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

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

Replace the damaged 7-way, RV-style trailer connector on your vehicle with this T-One harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. ModuLite reduces strain on wiring system. Call 800-298-1624 to order Tekonsha custom fit vehicle wiring part number 118290 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (34928)
  • Q & A (12)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118290

  • Custom Fit
  • Trailer Hitch Wiring
  • 7 Blade
  • Tekonsha
  • Powered Converter

Replace the damaged 7-way, RV-style trailer connector on your vehicle with this T-One harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. ModuLite reduces strain on wiring system.


Features:

  • Wiring harness replaces damaged factory 7-way, blade-style trailer connector at the back of your vehicle
    • Enables your truck to power your trailer's signal lights
    • Compatible with 4-pole, 5-pole, and 6-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Tow harness with 7-way connector plugs into connection point behind rear interior trim panel
    • ModuLite connects in rear cargo area
  • Supplies required relays and fuses to activate functions
  • Constructed of 16-gauge bonded wire
  • Mounting bracket sold separately


Specs:

  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 12 amps per circuit
  • Limited 1-year warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness. You will have to remove access panels, threshold, trunk floor panels and trays, and some interior paneling to access this harness. The connection point for the 7-way tow harness is located behind the rear bumper, on the driver's side. The Modulite plugs into the factory wiring harness within the driver's-side storage compartment in your rear cargo area. Once you've plugged in the Modulite, insert the included fuses and relays into your fuse panel as indicated in the instructions.


Once installation is complete, the 7-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 7-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.



118290 Tekonsha Replacement Harness for Factory Tow Package - 7 Pole - Modu-Lite

Installation Details 118290 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector - 118290

Average Customer Rating:  4.8 out of 5 stars   (34886 Customer Reviews)

Replace the damaged 7-way, RV-style trailer connector on your vehicle with this T-One harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. ModuLite reduces strain on wiring system.

- 118290
by:

Very easy to install, much closer to a 2 out of 10 installation difficulty. You must pull the rear facia, which has about 6 screws and 10 plastic plug in holders, unbolt the bumper (8 bolts), and bolt on the hitch in place of the bumper using the same holes. Piece of cake. It would be helpful if they would tell you that the top 2 plastic push in fasteners at the rear wheels will release if you push the tiny center button in. This is opposite of normal and can be frustrating. Less than 1 hour install. Seven pin connector looks to be a PIA, but I need the reverse light signal.



- 118290
by:
2020 Subaru Ascent

Kit was nice, but the bracket I purchased did not match the 7 pin connector so I had to drill the connector to match the holes.


Comments
Product electronics failed within 1 year. I had to splice in other trailer controller electronics.
R F - 05/06/2021

Thank you for your review. This product has a 1 year warranty. Be sure to check warranties out in the future.

-- Etrailer Expert Sierra K - 5/17/2021


- 118290
by:
2019 Subaru Ascent

Maybe don't connect the power wire and the ground in the wire wrap. I plugged in the power and immediately burned out the fuse. Maybe that is my bad but the directions could have been a little more clear about that.



- 118290
by:
2020 Subaru Ascent

Installed in my 2020 Subaru Ascent with no issues. The only thing I didn't do was run the black wire to the battery. All other lights tested okay and will be using it for the first time on the 30th of June.



- 118290
by:
2019 Subaru Ascent

Great hitch, easy to install. The 7-pin wiring harness was a bit more complex but I was able to find a way NOT to drill a new hole in my Subaru. I hope to share what I found with etrailer.com so that they can do a video of it. Shipping was fast and have been impressed with them before and will continue to do business with them in the future.



- 118290
by:
2021 Subaru Ascent



- 118258
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Product quality very high, delivery very fast, shipping container (cardboard box) was not strong enough to support handling/shipment, box bottom was ruptured with hitch assembly hanging out, box should be supported stronger, no parts missing, hitch was scratched up somebut, nothing that a little black paint didn't fix. I installed the wiring harness connections and fuse box on the external side of the vehicle to eliminate having to take apart the internal sheet metal panels and providing easy access to the fuse in the event of fuse failure, this eliminates the necessity of interior Panel removal to change a fuse. Easy installation, product has great great design features ,great customer service with prompt delivery. Just ordered the bracket (#18140) to secure the 4 prong plug to the hitch neatly and secure to eliminate the loose plug. (not shown in photos (Bracket in transit),


Comments
Great, works like a charm.
Anthony J - 09/27/2020


- 118252
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Just installed Draw Tight hitch, wire assembly along with the brackets for a nice look. Everything went smooth with installation and it has a nice clean look as the hitch is well hidden. This is going to work for our bike rack and the cargo carrier I am now going to by. Now I can also get a small utility trailer to pull and haul stuff. I strongly recommend etrailer for all your needs as they communicated with me the whole way through and readily replaced a lock unit that somehow came without the key. Customer service is top notch.


Comments
Absolutely Fine!
Scott N - 04/26/2020


- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


I purchased this for my 2013 Honda Pilot EX-L. I have not used the wiring harness yet, but the installation was extremely easy and quick. The instructions were very straightforward, and I was able to install everything within 30 minutes. Everything you need is inside the package except some bolts/nuts to mount the connector. I decided to cut out a hole and drill some holes for bolts. I opted for some black ones to match the colors. I'm extremely happy with this product and etrailer's fast and reliable service.



- 118264
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This is a perfectly tailored product for the do-it-yourselfer who with a little help adds a nice hitch to his vehicle. Getting an older vehicle's OEM installed weld nuts clean takes most of the time followed by installing the two washers and nuts in the fascia area. That part needs patience as the work area is limited. The Curt LED 4-Way Flat Connector (Vehicle End) Tester makes it very simple to verify the Tow Package - 4-Pole Flat Trailer Connector that is a snap to install to the vehicles pre-existing harness. One point to pay attention to in the instructional video is when pulling the square washer and bolt through the channel. They must slide in single file as shown. If you try to pull with the bolt through the washer it will get stuck and you will need to fish it out. So bottom line. Great product. Great support. Steve Stewart


Comments
Everything from the hitch to the wiring still works perfectly. Very pleased with the results
Stephen - 05/07/2020


- 118248
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Wish I bought etralier's tow harness earlier. Easy installation. Toyota dealership sold me the wrong one and of course waited too long to return. But use some of the parts from that harness on the one from etrailer(see pics). Would order again from etrailer. Thank you



- 118269
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Plug & play for 2020 Kia Sorento. Dinged a star because the trailer connector does not fit the extra bracket well. It does not appear to have been designed for a bracket mount. I had to force fit and secure in place with a zip tie.



- 118266
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Good product and great service from etrailer! !!!Important note: 2012 Nissan Xterra (depending on what factory it was built) has the 12v power and brake wire REVERSED on the factory installed harness. Meaning when you plug in your trailer, there will be constant power to the brakes on no power to the charge line. If this happens to you like it did to me, you need a tester and a couple butt connectors to make the switch at the 7 pin connector. Also note, these plugs use the trailer for the ground so you're tester wont read if the trailer is not plugged in and you have to hold one of the tester ends to metal on the trailer.


Comments
Thank you for your review. This is a common issue on the Nissans. I have attached a very helpful article that explains the issue and how to fix it.
-- Etrailer Expert Heather A - 05/12/2021


- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Needed a harness for my 2015 Honda Pilot LX and didn’t want to pay a king’s ransom for dealer parts and install. Ordered from etrailer and got a deal. Came with everything I needed and also had excellent, easy to understand instructions. Works perfectly.


Comments
This harness has worked like a charm. No problems at all.
Randy B - 06/01/2020


- 118252
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


FITS the new 2020 HIGHLANDER! There is a new connector with the 2020 Highlander redesign under the driver side rear bumper. This cable plugs directly into the Highlander connector. See photo. There is no need to route or run wires for the trailer wiring. You will also need a converter to provide the correct signals to this cable. I recommend using the Toyota Plug-n-play converter part number: PT725-48200. It’s around $60 online. Be aware it is installed behind a panel located next to the driver’s side second row seat. Toyota completely changed the vehicle wiring for the 2020 model year. I also recommend the CURT C99FR hitch. Fits perfectly, easy to install and hides behind the bumper.



- 118248
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Instructions provided with adapter are good. My 04 Highlander without tow package had the connector under rear, driver-side cargo tray. Lift the cargo floor, remove the tire-change-tool tray, remove the two plastic nuts on the bottom of the left-side tub, and lift it out. Also under that storage tub is an unused 6mm threaded hole in the body to be used for the ground. Put a fuse in the correct spot of engine compartment fuse block (mine was empty) and good to go. See underside of fuse block lid for tow adapter fuse placement.


Comments
Used 20 times this summer with no issues. I would buy again.
Michael A - 01/09/2021


- 118266
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


The hitch is great, but the screws for the electrical connector have rusted.


Comments
It’s still working. The screws are still rusted, though.
Tim M - 07/18/2020


- 118266
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This kit worked great. It took about an hour to install on my 2005 Xterra. The process was just like the video on etrailer.com. The only difference was that I mounted the bracket directly to my bumper instead of the hitch.


Comments
Working great. Im glad I purchased the 7-pin version for this car
Keith - 07/16/2020


- 118259
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Plug and play! This trailer power cable plugged directly into my factory Cadillac SRX wire harness. No wire cutting and splicing, absolutely the easiest installation I could imagine. Highly recommended for anyone who can use it. See photos showing the purchased product and where it plugged into the factory wiring harness.



- 118253
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Jesse at eTrailer help me with configuring my 2009 Honda Pilot to be able to pull legal loads. I had previously installed their 4 pin connector but I want to be able to use trailers with brakes to full extent. I added a Redarc brake controller in a convenient location. Easy to replace the current harness with the 7 way connector. A little more work to pull panels to locate the Redarc control head exactly where i wanted it, but no biggie. As always, great customer service and a great product. Thanks Jesse and all at eTrailer.



- 118249
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


If it were not for the Great Hitch I bought from you that I installed at a DIY garage I would be Homeless during this PANDEMIC, your Hitch saved me from all kinds of problems Your Product is Great!



- 118269
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This is my second hitch I purchased and installed. Both were great and the instructions for installing were spot on. My only complaint is that it is disappointing that the hitches do not have a nice integrated trailer light hook up. It’s a crappy bolt on or zip strip unsturdy light hook up. It doesn’t look nice after installed. And are very flimsy.



- 118269
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


I was very happy with etrailer.com The items were delivered in 3 days. The wire harness was an easy plug and play. And mounted nicely to the hitch wit items the short mounting bracket and 4-Pole mounting bracket.



- 118255
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Excellent prompt personal service. Website made it easy to select the correct components for my particular SUV. Was kept informed throughout the delivery process, I knew exactly where my package was and when it would arrive. Would certainly recommend using etrailer - a great and professional service. Fitting the wiring was a breeze, once the appropriate socket for the trailer module was located (hiding behind the rear R/H side fascia panel)



- 118252
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


I ordered and received a trailer hitch and wiring kit for my 2015 RX350 and also received a very informative video with it. It fit great and is almost invisible and no drilling was necessary. The only issue I had was I was supposed to reuse 2 of the bolts to rehang the exhaust but my bolts were tapered on the end and wouldn't fit so I had to use some generic bolts. But it's still a great product.


36
3638
Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • 7-Way, Trailer Hitch, and Brake Controller for 2019 Subaru Ascent
    For your 2019 Subaru Ascent we have the 7-way kit part # 118290 which is a confirmed fit and installs with minimal wiring since it ties into factory wiring. The Draw Tite hitch part # 76253 has a bracket to the left of the hitch opening that a 7-way can attach to. You can use a bracket like the # C67UR to attach to the 7-way of the # 118290. Then for a brake controller the Redarc Tow Pro Liberty part # RED24FR would be a really great choice as it's mostly out of main view, is proportional,...
    view full answer...
  • Troubleshooting No Power to 7 way Plug From Converter on Tekonsha 118290
    The Tekonsha # 118290 is a confirmed fit on the 2020 Subaru Ascent, and it sounds like maybe you're seeing different colors on the wires coming out of your factory harness compared to the one on the on the Tekonsha # 118290 harness. I'll start by saying that the colors aren't always a perfect indicator, so you can use a circuit tester like the # PTW2993 to test the wires going into the harness that you're plugging into to make sure that they're providing power with the appropriate functions...
    view full answer...
  • Do I Have to Connect the Black Wire on the 118290 on my 2020 Subaru Ascent
    If all of your signals are working there may be no need to connect the wire that is for the 12 Volt trailer power on the Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector part # 118290 but I can not advise you to do anything except what is found in their instructions which states to connect the wire. In some cases not only does this wire power the 12 volt connector but may also be used to power the converter taking the excess strain off of your vehicles wiring harness.
    view full answer...
  • Advice for Routing Power Wire for Tekonsha Trailer Wiring on 2020 Subaru Ascent
    Basically all of the instructions for trailer wiring like the Tekonsha # 118290 for your 2020 Subaru Ascent are kind of vague when it comes to routing the power wire to the battery which is why we came up with a helpful article on this (see attached). Although it seems like a pain, the easiest way to route the wire is by going under the vehicle. If there are any places where you can run the wire through the frame of your vehicle then do that as it will be the easiest way to avoid damage...
    view full answer...
  • Trailer Running Light Pin Active On a 2019 Subaru Ascent With Vehicle Off
    The running light pin on your trailer connector should not be active while the vehicle is off. If that is not the case then most likely the converter box has failed. For replacement, we have the Tekonsha OEM Replacement Vehicle Wiring Harness part # 118290 which can be converted to a 4 and 7-way trailer connector by adding the 7- and 4-Pole Trailer Connector Socket part # HM40975. The only other option you have is to take your vehicle in for service.
    view full answer...
    Image 1 for
  • How To Install a 7-Way Trailer Wiring Harness On a 2019 Subaru Ascent
    There are two different 7-way trailer wiring harnesses for a 2019 Subaru Ascent dependent on whether or not you have the factory tow package. If you do have the factory tow package then you should be using the Tekonsha OEM Replacement Vehicle Wiring Harness part # 118290, not the Universal Installation Kit for Trailer Brake Controller part # ETBC7. If you found a plug under the dash for the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers part # 3062-P then you have the factory...
    view full answer...
  • What Is Needed To Install The Redarc Tow-Pro Elite RED44FR In 2021 Subaru Ascent?
    The Redarc Tow-Pro Elite Trailer Brake Controller # RED44FR you were looking at will absolutely work in your 2021 Subaru Ascent, but how it is installed will depend on if your Ascent has the factory tow package or not. If your Ascent has the factory tow package you will be able to use the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers # 3062-P which will plug into the factory trailer brake controller port underneath the dash of your vehicle, and will only require you...
    view full answer...
  • Does Draw Tite Trailer Hitch for 2019 Subaru Ascent Have Capacity for Towing
    I certainly understand the concerns you mentioned for the Draw Tite hitch # 76253 which fits your 2019 Subaru Ascent but Draw Tite rigorously tested the capacity of this hitch and found it has a towing capacity of 5,000 lbs and a tongue weight capacity of 750 lbs. Draw Tite is normally very conservative with their capacity figures as well and tends to err on the side of caution always in this regard. As long as you plan to tow under the capacity of this hitch and your vehicle you will be...
    view full answer...
  • Recommend Brake Controller for 2021 Subaru Ascent Without Factory Hitch
    The Brake Controller that I would recommend is the Curt Echo Wireless Trailer Brake Controller # C51180. This brake controller will plug directly in between the 7-Way on your 2021 Subaru Ascent and the 7-Way on your 2017 Airstream RV Sport 16. The great thing is there is nothing to mount in your Subaru so you can easily move this between vehicles as you need. And there is no additional wiring for this unit under your dash that you will need to have connected. This is also a proportional...
    view full answer...
  • How To Mount 7-way Connector To Trailer Hitch Receiver On 2021 Subaru Ascent
    You will want to use the short no drill mounting bracket # 18140 to secure the 7-way connector to the Curt # C25VR on your 2021 Subaru Ascent. If you have not already ordered the 7-way connector I recommend the Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector # 118290 which is confirmed to fit your vehicle. In addition you will need another mounting bracket, # PK12711U as well. I included a few videos of the products mentioned for you to take a look at.
    view full answer...
  • Can Redarc Tow-Pro Elite RED44FR Be Installed On 2017 Subaru Outback Wagon To Tow Pop-Up Camper?
    If your pop-up trailer has electric trailer brakes then the Redarc Tow-Pro Elite Trailer Brake Controller - 1 to 3 Axles - Proportional # RED44FR you were looking at is a perfect choice for a trailer brake controller, and will work with your 2017 Subaru Outback Wagon. Since you mentioned you only have a 4-way connector currently installed, you will need to install a 7-way connector, but the # 118290 you were looking at is only confirmed to fit the 2019-2021 Subaru Ascent. Instead...
    view full answer...
  • Parts Needed To Tow Trailer With 2021 Subaru Ascent
    The Curt Trailer Hitch Receiver # C13400 you were looking at for your 2021 Subaru Ascent includes everything needed to get it installed. Now since you mentioned you are planning on towing a trailer you will need a vehicle wiring harness # 118790 if your trailer has a 4-way connector, or # 118290 if your trailer has a 7-way connector. In addition if it has a 7-way connector and trailer brakes you will also need a trailer brake controller. I recommend the Curt Echo Wireless # C51180...
    view full answer...




  • Why etrailer.com?

    At etrailer.com 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

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

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Kathleen M
Installed by:
Kathleen M
Employee Chris R
Video Edited:
Chris R
Employee Sarah W
Updated by:
Sarah W
Employee Isabelle B
Updated by:
Isabelle B
Employee Ronnie R
Written by:
Ronnie R

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