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  1. Custom Fit Vehicle Wiring
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  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 7 Round - 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
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Custom Fit Vehicle Wiring

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Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector Powered Converter 118290
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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. 1-833-496-1390 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.
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  • Reviews (12)
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Tekonsha Custom Fit Vehicle Wiring - 118290

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

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:  4.7 out of 5 stars   (12 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.

by:

It was easy to install. the only problem with the installation was for the plug mounting. There was no clear cut mounting instruction and where to put it. It worked out ok. All is working well.




by:

Not easy to made the connections at back of the receptacle but once connected it worked fine. Videos at etrailer are excellent and very helpful!!




by:

A work Intensive kit, but high quality material for a custom installation.




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.




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.




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.




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



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.




by:
2019 Subaru Ascent

Product arrived in timely fashion and with no issues.




by:
2022 Subaru Ascent




by:
2020 Subaru Ascent




by:
2021 Subaru Ascent



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



  • 20 amp or 40 amp Charger for 2021 Subaru Ascent for Use with Tekonsha Trailer Wiring 118290
    Due to the thinner gauge wiring of the # 118290 for the 12 volt accessory circuit you'd be limited to the 20 amp charger for your battery.
    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...
  • 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...
  • 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
  • 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...
  • Brake Lights and Turn Signals Not Working on Trailer With Tekonsha 7-Way Harness On 2020 Ascent
    It sounds like there may be a damaged or missing fuse on your 2020 Subaru Ascent. I recommend checking your fuse panel for any damaged or missing fuses that are identified as trailer or turn signal fuses. You can also test the wiring going into the powered module for signal with a Circuit Tester # PTW2993. This will help you to determine if the module on the Tekonsha OEM Replacement Vehicle Wiring Harness # 118290 is faulty or if you are not getting the signal from the Ascent that tells...
    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...
  • Does Draw-Tite Trailer Hitch 76253 Increase Tongue Weight Rating Of 2021 Subaru Ascent?
    Based on what information I was able to find on your 2021 Subaru Ascent you will be limited to 500lbs tongue weight if you have the air-cooled continuously variable transmission fluid cooler, and 200lbs if you do not. In either case you will be limited to the lower rating between the vehicle and the trailer hitch receiver, in this case the Draw-Tite Trailer Hitch Receiver # 76253 you were looking at. Since both ratings of the vehicle are lower than the rating of the hitch, you would be...
    view full answer...
  • 7-Way and 4-Flat Connector for a 2020 Subaru Ascent
    Yes, we do have a wiring harness that has both a 7-way and a 4-way for your 2020 Subaru Ascent. However, you will need a 4-way connector on your car before this will work though. I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118790. This harness plugs in to existing wiring to provide a 4-flat connector. The 7-Way and 4-Way all in one connector you referenced is the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and...
    view full answer...
    Image 1 for
  • How To Install The Curt Spectrum Trailer Brake Controller In A 2022 Subaru Ascent
    To install the Curt Spectrum Trailer Brake Controller # C51170 on your 2022 Subaru Ascent without factory tow package you'll need to first install a wiring harness. I recommend the Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector # 118290 as it comes with a 7-way and is a simple plug-and-play installation. Once the the wiring harness is installed you can wire the Universal Wiring Adapter for Curt Trailer Brake Controllers # C51515 that came with your # C51170...
    view full answer...
  • Trailer Connector/Wiring Harness for 2021 Subaru Ascent
    The correct wiring harness needed will depend on the type of trailer you're wanting to pull. If you're pulling something basic like a small utility trailer and only need a 4 pole trailer connector, the # 118790 would be what you need. However, if your trailer has a 7-way trailer connector, you'll need the # 118290.
    view full answer...
  • Recommended 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...
  • Parts Needed To Install Redarc Tow-Pro Elite on 2022 Subaru Ascent Without Factory Tow Package
    In order to install the Redarc Tow-Pro Elite Trailer Brake Controller # RED44FR on your 2022 Subaru Ascent you will need to start with a wiring harness. Luckily for you the Ascent has a 7-way option that does not require the installation of a 4-way first. For this, you will want the Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector # 118290. This wiring harness will plug into the connection point behind the rear interior trim panel. Once installed, you will have...
    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 as...
    view full answer...
  • 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...
  • Comparing Curt Trailer Hitch C25VR and Draw-Tite 76253 For 2021 Subaru Ascent
    You are correct that the Curt Trailer Hitch Receiver # C25VR and Draw-Tite # 76253 you were looking at for your 2021 Subaru Ascent are very similar. They both share pretty much the same design, and both have a 750lb tongue weight rating and 5,000lb trailer weight rating. With that said I recommend going with the Curt # C25VR due to it being made here in the USA, and in our experience the powder coat finish used on the Curt brand hitches holds up the best leading to a hitch that will stay...
    view full answer...
  • Tekonsha Brake Controller and Wiring Harnesses for 2021 Subaru Ascent
    I would be happy to help you set up your Subaru Ascent for a brake controller. Since you don't have the factory tow package you're going to need 2 different parts. I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118790. This T-One connector plugs directly into existing wiring behind your Subaru's rear tail lights requiring no cutting or splicing. The powered ModuLite reduces strain on wiring system by connecting directly to your vehicles battery. The...
    view full answer...
  • Recommended 7-Way Connector for a 2021 Subaru Ascent
    I would be happy to help you. For a 7-way wiring harness on your 2021 Subaru Ascent you will want the Tekonsha OEM Replacement Vehicle Wiring Harness with 7-Way Trailer Connector item # 118290. This custom-fit T-One connector plugs into your vehicle's wiring harness. The connection point for the 7-way tow harness is located behind the rear bumper, on the driver's side. You will also need the Mounting Bracket and Installation Hardware item # PK12711U to mount the 7-way onto your hitch. Unless...
    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 to...
    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...
  • Parts Needed to Install Brake Controller in 2019 Subaru Ascent with Curt 4-Way
    Since your 2019 Subaru Ascent has a Curt 4-way # C56040 installed that would indicate that you do not have the factory tow package which means you do not have brake controller wiring under your dash. So to convert to a 7-way and install a brake controller you'd need the # ETBC7 which is a 4-way to 7-way adapter that also comes with all wiring needed for brake controller installs. Then for a brake controller the Brake EVN # TK63VR is a really great option that's proportional and very reliable.
    view full answer...
  • Recommended Trailer Hitch For A 2022 Subaru Ascent
    For your 2022 Subaru Ascent I recommend the etrailer Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2" # e55ZR. This hitch is made in the US and has a rugged matte black powder coating finish that will better match any black trim on your vehicle and hide any scratches better than hitches with a gloss black powder coating. This hitch has a maximum gross trailer weight capacity of 5,000lbs and maximum tongue weight capacity of 750lbs and is rated for use with a weight...
    view full answer...
  • Recommended Trailer Hitch Receiver for 2022 Subaru Ascent Premium
    I recommend the etrailer Trailer Hitch Receiver # e55ZR for your 2022 Subaru Ascent Premium. This Class III hitch has a 2" receiver and is completely hidden when the center bumper cover is attached. It has a maximum gross trailer weight of 5,000 lbs, tongue weight of 750 lbs, and is compatible with weight distribution. It features a rugged, matte black finish for rust and corrosion protection and is made in the USA. If you plan on doing some towing and need wiring, you will also want the...
    view full answer...
    Image 1 for
  • 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 you...
    view full answer...


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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 Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Ronnie R
Written by:
Ronnie R

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