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Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector

Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector

Item # TK22115
Our Price: $205.74
Custom Fit Vehicle Wiring

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Replace the 7-way, RV-style trailer connector on your vehicle with this T-One harness. ModuLite reduces strain on wiring system. Brake controller adapter attaches to included body harness and lets you easily plug in your electric brake controller. 1-833-496-1390 to order Tekonsha custom fit vehicle wiring part number TK22115 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (13)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - TK22115

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

Replace the 7-way, RV-style trailer connector on your vehicle with this T-One harness. ModuLite reduces strain on wiring system. Brake controller adapter attaches to included body harness and lets you easily plug in your electric brake controller.


  • Towing prep kit 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)
  • T-One connects quickly and easily
    • Plug into connection points behind tail lights
    • Run body harness up to car battery
  • Included tail light converter ensures that your vehicle's wiring matches that of your trailer
  • Wiring adapter eases installation of your electric brake controller
    • Wire end connects to included body harness and vehicle battery
    • Other end plugs into the back of your electric brake controller
      • Compatible time-delayed brake controllers: Draw-Tite Activator I (5100), Draw-Tite Activator II (5500), Draw-Tite Activator III (5520) and Tekonsha PowerTrac (39523)
      • Compatible proportional brake controllers: Tekonsha Prodigy (90185), Tekonsha P2 (90885), Tekonsha P3 (90195), Tekonsha Primus IQ (TK90160) and Tekonsha Voyager (39510)


  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty

Installation of Tekonsha T-One Connector

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove some bumper fascia, interior paneling, vent covers, and the tail light assemblies to access this harness. Once you've plugged in the T-connector, run the body harness up to your car battery and connect the wires per the included instructions.

T-One Connection Location Points Behind Tail Lights

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 your vehicle runs on a multiplex wiring system, the wiring needs to be converted to be 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.

Installation of Tekonsha Brake Controller Adapter

This adapter hardwires to the body harness that is included in this kit. Just connect the black wire from the brake controller adapter to your car battery, and connect the white wire to a suitable ground. The remaining wires can then be easily spliced into the body harness with the included butt connectors.

This adapter is designed to plug directly into your electric brake controller. Because the harness does not hardwire to your controller, installation is not permanent. You can unplug and remove your brake controller at any time and securely stow it away.

22115 Tekonsha Replacement Harness with Brake Control Adapter for Factory Tow Package - 7 Pole - Modu-Lite

Installation Details TK22115 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector - TK22115

Average Customer Rating:  4.4 out of 5 stars   (13 Customer Reviews)

Replace the 7-way, RV-style trailer connector on your vehicle with this T-One harness. ModuLite reduces strain on wiring system. Brake controller adapter attaches to included body harness and lets you easily plug in your electric brake controller.

2014 Mercedes-Benz Sprinter

I used this wiring harness on my 2014 Sprinter. The instructions for this product was spot on, and i very much liked how it was plug and play, no wire splicing. The harness plugged right into the factory harness just like it came from the factory. It did take a little bit on my part fishing the wires thru the cavity wall supports and keeping it neat and organized, but overall 5 stars. Sorry, i forgot to take pics.

Thanks etrailer

Great, no issues.
Tony D - 02/11/2021

Mercedes-Benz Sprinter

Best sprinter wiring kit. Do yourself a favor and save time and hassle with this kit. Also seems much better at blocking corrosion to sensitive areas (than diy) as you don't need to splice anything outside of the vehicle.


Much less expensive than Mercedes part, which didn’t work and had no instructions. Easy but tedious installation. Still working fine though I prefer to leave the end connector inside the van except when in use to avoid corrosion.


Harness worked great and continues after a year of use



Great customer service and follow through. Product as described.





2015 Mercedes-Benz Sprinter

2015 Mercedes-Benz Sprinter

2020 Mercedes-Benz Sprinter 3500


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

  • 7-Way Trailer Wiring Kit for 2015 Mercedes-Benz Sprinter
    Yes, the Tekonsha 7-way kit part # TK22115 is exactly what you need. It is a 7-way kit designed to fit your 2015 Mercedes-Benz Sprinter that did not have the factory connector. This is what you'd need for a new install that didn't have any trailer wiring currently.
    view full answer...
  • Does Tekonsha OEM Wiring Harness Kit TK22115 Fit Extended Wheelbase Sprinter
    Tekonsha OEM Replacement Vehicle Wiring Harness Kit # TK22115 fits the 2014 Freightliner Sprinter without factory tow package, both the short and long wheelbase versions. Since Sprinters are offered in more than one wheelbase length this kit is made to work with all of them, even the 170-inch extended version. I confirmed this with my contact at Tekonsha. This kit includes the brake controller wiring adapter needed to install one of the excellent Tekonsha trailer brake controllers such...
    view full answer...
  • Connecting a Brake Controller Red Wire on a 2017 Mercedes Sprinter 2500
    Your 2017 Mercedes Sprinter 2500 may actually have brake controller port or wiring harness that you can use to install a brake controller. I have included a link to a video that may help. It is on a slightly older Sprinter but can be used as a guide. The 2006 to 2018 are part of the same generation. If the van has a third brake light (CHMSL: center high mount stop lamp) and it is the only thing on that fuse you could use it to attach to the red brake controller wire. The white ground...
    view full answer...
  • Is There a Trailer Wiring Harness for a 2017 Mercedes Sprinter 2500 That Has Both 4 and 7-Ways
    The Tekonsha OEM Replacement Vehicle Wiring Harness part # TK22115 is a great option for a 2017 Mercedes-Benz Sprinter 2500. It as you noted has a 7-way plug but there isn't a complete harness with both 4 and 7-way plugs as is. Therefore, I suggest just adding the 7- and 4-Pole Trailer Connector Socket part # HM40975 which also comes with a bracket that you'll need.
    view full answer...
  • 2020 Mercedes-Benz Sprinter 2500 Draw-Tite 7-Way Connector Mounting Bracket
    I recommend the Draw-Tite mounting bracket for 7-Way connectors item # 18138 for your 2020 Mercedes-Benz Sprinter. This bracket will install to the left of the receiver opening on your Draw-Tite hitch item # 75549 on the steel tab that is on the frame of the hitch receiver. This will allow you to attach your Tekonsha 7-Way connector item # TK22115 directly to your hitch receiver for easy access. I have attached a link that will demonstrate the ease and access this mounting bracket will...
    view full answer...
  • Recommended Plug And Play 7 Way Trailer Connector For A 2019 Mercedes-Benz Sprinter 2500
    When it comes to installing a plug and play 7 way harness on your 2019 Mercedes-Benz Sprinter 2500 The Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector # TK22115 is confirmed for your vehicle. The custom-fit harness plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. I attached a review video link below.
    view full answer...
  • Trailer Hitch for 2019 Sprinter 2500, 144"WB, and Std. Bumper
    Yes, the Draw-Tite # 75549 hitch you referenced will fit your 2019 Mercedes-Benz Sprinter 2500 with 144" wheelbase, standard rear bumper, and frame measuring 39-1/4" outside dimension. This installation will not require you to drill any holes and will not interfere with your spare. If you will be towing you need a tow ball and ball mount. Without knowing the offset between the trailer and tow vehicle I can't recommend a specific item, but, I have supplied a link to an FAQ below regarding...
    view full answer...
  • Trailer Hitch, Wiring, and Brake Controller Recommendation for 2016 Mercedes Sprinter 2500
    Yes, for your 2016 Mercedes Benz Sprinter 2500 the Draw Tite hitch part # 75549 is a fit and my recommendation for your application as it has the capacity you need and installs easily as well. I attached an install video for this for you to check out as well. To install a 7-way all you need is the # TK22115 and then the easiest solution for a brake controller is the Curt Echo Mobile part # C51180 which basically just plugs into an active 7-way and once synced to your smart phone is ready...
    view full answer...
  • Recommended Trailer Hitch Receiver and Wiring for 2021 Mercedes-Benz Sprinter 2500 With 144 Inch WB
    For your 2021 2021 Mercedes-Benz Sprinter 2500 with a 144" wheelbase and standard bumper I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # 75549. This is a custom fit Class III hitch with a 2" receiver. IT has a maximum gross trailer weight of 6,000 lbs and tongue weight of 600 lbs. It features a black powder coat finish and comes with a limited lifetime warranty. For wiring, you have two good options depending on what you need. The first is the Tekonsha T-One Vehicle Wiring...
    view full answer...
  • Towing Wiring Harness For Mercedes Sprinter 2500
    We do not recognize this connector that you have provided a picture for but we have a solution. We do not have an adapter to go between that plug and a 7-way connector. However you can create your own 7-way jack for your trailer to plug into. You will need to install a Tekonsha # TK22115 wiring harness that includes the 7-way connector for the back of your Sprinter. If you will be towing a trailer with brakes, you will additionally need the Tekonsha # 90195 brake controller. This installs...
    view full answer...
    Image 1 for
  • Best Way to go From 4-Way to 7-Way for 2017 Mercedes Sprinter 2500
    If the travel trailer with a 7-way does not have brakes the easy solution is the # 37185 which would plug right into your current 4-way and all of the lighting circuits would be active. If instead you did have trailer brakes you'd want to use the # ETBC7 which comes with brake controller wiring needed as well as the same adapter of the # 37185. The 7-way kit part # TK22115 which is custom fit for you vehicle essentially is the same setup as a 4-way like you have converted to a 7-way with...
    view full answer...
  • Does The Spare Tire Need To Be Removed to Install Curt Hitch On 2019 Mercedes-Benz Sprinter 2500
    According to Curt you will not need to remove the spare tire when you install part # C13388 as long as it is a standard spare tire size. As long as the 2019 Mercedes-Benz Sprinter 2500 is a 170 or 144 inch wheel base, standard bumper and is not a passenger van this hitch is confirmed to fit without removing the spare tire. If you need wiring, I recommend Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter part # TK22115 because it is the easiest way to install...
    view full answer...
  • Best Trailer Hitch For 2021 Mercedes-Benz Sprinter 2500 W/ 170" Wheelbase and Standard Bumper
    For your 2021 Mercedes-Benz Sprinter 2500 with the 170" Wheel Base and standard rear bumper I recommend going with the Curt Trailer Hitch # C13388 due to it being made in the USA, and giving you 1" more ground clearance than the other available trailer hitch, the Draw-Tite # 75549. Keep in mind this hitch will only fit if your van is the cargo version, and not a passenger van. If you will be towing a trailer with your Sprinter then you will also need a vehicle wiring harness # 118649...
    view full answer...
  • Which Trailer Hitch For A 2021 Mercedes-Benz Sprinter 2500 Gives The Most Ground Clearance?
    For your 2021 Mercedes-Benz Sprinter 2500 with the standard bumper, the Curt # C13388 and the Draw-Tite # 75549. While we have not had a chance to install both of these hitches yet, when we measured these hitches we found that from the center of the upper mounting hole to the bottom of the hitch on the Draw-Tite # 75549 measured 12-1/4" where the Curt # C13388 measured 11" which you can see in these diagrams, meaning the Curt hitch will sit closer to your bumper and give you better ground...
    view full answer...
    Image 1 for Image 2 for
  • Van build and Recommended Receiver Hitch for 2021 Mercedes-Benz Sprinter 2500
    If your 2021 Mercedes-Benz Sprinter 2500 has the factory step bumper, I suggest the Curt Trailer Hitch Receiver, # 13358. If you have the standard bumper, then the Curt Trailer Hitch Receiver, # C13388. Both of these are Class III hitches that are fully welded in their construction and have received an excellent powder coated finish. They are a bolt-on installation and each will fit the long or short wheel base version, type bumper that is in place is the deciding factor for over the...
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Towing Setup for a 2020 Mercedes-Benz Sprinter 2500 w/ Factory Step Bumper and a 144WB
    Yes, we do sell a hitch that is compatible with the factory step bumper on your 2020 Mercedes-Benz Sprinter 2500. It is the Draw-Tite Max-Frame Trailer Hitch Receiver item # 75601. This hitch is custom fit and designed to fit the 144WB of your Sprinter van. I have attached an installation video. This hitch also comes with a bracket to mount a 7-way vehicle connector. I recommend the Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector item...
    view full answer...
  • 2021 Midwest Automotive Designs Passage 170 Ext Ball Mount and Wiring Harness
    For your 2021 Midwest Automotive Designs Passage 170 EXT Sprinter van I recommend the Tekonsha Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector item # TK22115 if you are needing a 7-way connector. If you are only needing a 4-way connector to control lighting functions on your trailer you will want the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118649. To round out your towing setup I recommend the...
    view full answer...
  • What Adapter to Use With RedArc Tow Pro Classic on 2020 Mercedes Benz Sprinter 3500
    It sounds like you're asking about an available adapter plug to install the RedArc Tow-Pro Classic # 331-EBRHV2, and as long as it came with the factory towing package you can use the # 3063-P to install this brake controller. If your 2020 Mercedes-Benz Sprinter 3500 did not come with the factory towing package, the Tow-Pro Classic will need to be hardwired in. Additionally, the RJ45 cable only is available in the 3ft length that comes with the unit. This is a standard RJ45 network cable...
    view full answer...
  • Recommended Trailer Hitch For 2020 Mercedes-Benz Sprinter 2500 Long Wheelbase Standard Bumper
    As long as your 2020 Sprinter 2500 with the 170 inch wheelbase and standard bumper isn't a passenger van and the frame members do NOT measure 30-3/8 inches apart measured outside of frame to outside of frame, the Curt Class III hitch, part # C13388 will fit perfectly. If you have the passenger version, you'll want to use the Draw-Tite # 75549 instead. If you'll be towing with the hitch, you'll also need a trailer wiring harness like part # 118649 for a 4 pin connector or # TK22115 for...
    view full answer...
  • 2021 Mercedes-Benz Sprinter 2500 Wiring Mounting Bracket Options for Curt Trailer Hitch
    To hang a wiring connector from the Curt Trailer Hitch Receiver # C13388 on your 2021 Mercedes-Benz Sprinter 2500 you need a No-Drill Mount Bracket # C57202 and then you can use the Bracket # 18144 for the 4-Way # 118649 or the Bracket # 18138 for the 7-Way # TK22115.
    view full answer...
  • Recommended Trailer Hitch and Wiring for 2022 Mercedes-Benz Sprinter 2500 with Step Under Bumper
    The trailer hitch I recommend for a 2022 Mercedes-Benz Sprinter 2500 with factory step bumper is the etrailer Trailer Hitch Receiver part # e82TR which offers a direct bolt-on fit so there's no drilling required. This trailer hitch is rated up to 7,500 lbs which is the highest available for this vehicle. The max the vehicle can tow is 5,000 lbs so there is no need to go much further over this. In regards to the trailer wiring, I recommend the T-One Vehicle Wiring Harness part # TK52VR...
    view full answer...
    Image 1 for Image 2 for
  • 2016 Mercedes-Benz Sprinter 3500 Motorhome Wiring Needed for Brake Controller
    If your Sprinter Motorhome doesn't have the OEM connector for you to install the Redarc Tow-Pro Elite Trailer Brake Controller # RED44FR by using the Custom Wiring Adapter # 3063-P and Adapter # 331-TPH-017 then you'll likely have some loose wiring somewhere or you'll have to install the wiring. The wiring will either be under the dash or under your driver's seat and should be labeled in some manner for you to splice the correct functions together. If your 2016 Mercedes-Benz Sprinter 3500...
    view full answer...
  • Recommended Hitch and Hitch Mounted Step for 2019 Mercedes-Benz Sprinter 2500
    As long as your Sprinter doesn't have the 30-3/8 inch frame width (measured outside frame to outside frame) the Draw-Tite Class III hitch you'd looked at, part # 75549 would be a fit. For a large and very durable hitch mounted step, I'd highly recommend something like the Carr Mega Step, part # CARR190011 for silver or # CARR190011B for black. The step has a whopping 500 lb weight capacity, can can fold up when it's not needed. I'd also highly recommend a hitch lock like # e98882 to prevent...
    view full answer...
  • Brake Controller Installation on 2016 Mercedes-Benz Sprinter
    Assuming your Sprinter has the factory tow package with the 7-way at the rear bumper, in addition to the # RED24FR Redarc Tow-Pro Liberty Brake Controller, you'll also need the # 3063-P wiring harness and the # 331-TPH-017. The connector to install the controller is located under the driver's seat as shown in the provided photo. If the Sprinter doesn't have the factory 7-way, you can install one using part # TK22115, you'll also need the # 331-TPH-017 adapter mentioned above.
    view full answer...
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