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Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers

Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers

Item # 3066-P
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Accessories and Parts 3066-P - Wiring Adapter - Tekonsha
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Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your vehicle's dash. Call 800-298-1624 to order Tekonsha accessories and parts part number 3066-P or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers. Accessories and Parts reviews from real customers.
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Tekonsha Accessories and Parts - 3066-P

  • Trailer Brake Controller
  • Wiring Adapter
  • Plugs into Brake Controller
  • Tekonsha
  • Vehicle Specific

Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your vehicle's dash.


Features:

  • Wiring adapter eases installation of your electric brake controller
  • Custom connector end plugs into the built-in port beneath the dash of your vehicle
  • 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)
  • Limited 1-year warranty


Installation of Tekonsha Brake Controller Adapter

This adapter plugs into the 4-pin connector on your vehicle's built-in brake control wiring harness. The harness is located underneath the dash. Pull back the carpet behind the brake pedal to expose the connector.


To install your electric brake controller you need to connect the wiring of the controller to your vehicle. Certain manufacturers offer pre-wired options, typically known as tow packages, wherein these wires are run for you from the dash to the trailer connector on the back of your vehicle. Often, a brake controller wiring harness is included with your tow package. This harness plugs into a port beneath your dash and connects to the four wires of the brake controller. If, however, you have a brake controller with a plug in place of the four loose wires, you can use the Tekonsha adapter.


This adapter requires no hardwiring. It is designed to plug directly into your electric brake controller for the simplest installation possible. Because there are no wires to connect, installation is not permanent. You can unplug and remove your brake controller at any time and securely stow it away.



3066-P Tekonsha Brake Control Wiring Adapter with 2 Plugs

Installation Details 3066-P Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - 3066-P

Average Customer Rating:  5.0 out of 5 stars   (26 Customer Reviews)

Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your vehicle's dash.

- 3066-P
by:

Fit perfectly into our 2020 GLS 580 and into our 2020 VS30 Sprinter 2500, both with a Mercedes factory trailer hitch. Greatly simplifies the installation.



- 3066-P
by:
2018 Mercedes-Benz GLS-Class

Fit perfect in my 2018 MB GLS AMG edition. Simple plug and play with the electronic brake controller. Worked perfect after I hooked it up. Just used some zip ties to keep all wires nice and organized.


Comments
One year later Still working great. No issues. Buy this will confidence.
Clint - 07/15/2021


- 3066-P
by:

I'm going to skip the reviews for Item #3066-P Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers and for Item #331-TPH-017 Redarc Tow-Pro Wiring Adapter for Tekonsha Brake Controller Harness. They just work to get the signals from A to B. Installing this in my Merc ML-250 Bluetec was straight forward, but I thought quite a bit about the knob placement. Finally ended up mounting this next to the ashtray, opposite of the cigarette lighter. This location won't work for those with heated/cooled cupholders as this is the location used for that controller. This location works well for mounting as there is clearance below and the knob is low-profile enough that the sliding door can still cover the area. Just need to be careful with wire routing. Route towards the back of the car, then reverse course up to the front, such that the slider can retract into this space. The main body of the unit is mounted under the dashboard above the brake pedal, completely hidden from view and out of the way of feet and knees.



- 3066-P
by:
2018 Mercedes-Benz GLE

Works great as designed, easy install on 2018 MB 350 with factory tow. Cable was long enough to connect under dash by the brake pedal and snake around under center dash.



- 3066-P
by:

Very simple to install. Have not hooked to trailer yet.



- 3066-P
by:

etrailer came through again. I think they really do their homework on the products they offer as I have used them many times now. I do still suggest improving their listings (every company) as the whole internet sales thing is lacking everywhere. It should be better than shopping in person. More info and often it would help to show the product in use. imho



- 3066-P
by:

Wow! What an easy install. Plug this in. Plug in the brake controller. Done. The instructions even told me where to look for the plug on the car side for my model vehicle.



- 3066-P
by:

Worked just as advertised, couldn't be happier


Comments
Perfect, no issues
Graham - 12/18/2021


- 3066-P
by:

Fit ML 350 harness as OEM product.


Comments
Great product. Needed the factory harness to simplify the controller installation to the OEM on board connector. Works as advertise.
marcel d - 03/11/2021


- 3066-P
by:
Mercedes-Benz

To Dena, my order for Mercedes GSL Class connected perfectly to existing factory tow package pre-existing wiring. Have not tried out controller with RV yet, but are planning to on 3/29/20-camping trip. I was first told by local installer that my ONLY controller option was the Bluetooth set up. I am so glad to have you as my go to FOR rv-trailer needs. Shipment was very timely. Thanks so much, Ray K



- 3066-P
by:

Worked as described, fast delivery.



- 3066-P
by:

Excellent product. It connected directly to my 2019 GLS 450 factory harness and installed in five minutes. It’s my second time purchasing this product.



- 3066-P
by:
2013 Mercedes-Benz M-Class

After reading what I could find online, I was searching for a brake controller for my vehicle. I ran across etrailer and found their prices to be competitive. I emailed with some questions specific to my vehicle and fully expected a several day wait for my answers. Within hours I had received a response from a real person, Madison P. He was extremely knowledgeable and helpful. I purchased the unit and it was delivered 2 days later. Super service!!



- 3066-P
by:

Exact fit and function for true plug-and-play function. The quality is good and the length is more than long enough to reach from the factory connection behind the GLE350 brake pedal over to where I mounted the electric brake controller. The vehicle connection end even matches the green color to help color-code the connections. This is the only source for this that I found at the time I purchased it and so long as the brake controller has a standard connection it should work with any brand.



- 3066-P
by:

I like this brake controller. It is easy to set up and adjust. Only gripe is I can't get it exactly set so that the trailer doesn't jerk when braking at low speeds.



- 3066-P
by:

Exactly what I needed! Thanks!



- 3066-P
by:

Bought Draw-Tite Activator IV for a 2018 Mercedes GLS. Installed with Tekonsha 3066-P harness. The Tekonsha harness plugged into the Mercedes pre-wired harness easily. The Draw-Tite was easy to install and works perfectly.



- 3066-P
by:
2015 Mercedes-Benz GL-Class

Easy to install. Connected right to the OEM plug and to the plug on the brake controller. Works as advertised.



- 3066-P
by:

Easy set up. Works great. Etrailer is awesome to deal with.



- 3066-P
by:

They have just about everything related to trailers. Easy to use website. A+



- 3066-P
by:

plug-n-play, super easy



- 3066-P
by:
2014 Mercedes-Benz GL-Class

Fit just as described



- 3066-P
by:
2015 Mercedes-Benz M-Class

Good fast shipping. Very clear website.



- 3066-P
by:
2013 Mercedes-Benz GL-Class



- 3066-P
by:
2014 Mercedes-Benz GL-Class


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Show More Reviews

Ask the Experts about this Tekonsha Accessories and Parts



  • Plug and Play Brake Controller Harness for 2015 Mercedes-Benz GL-Class
    Part # 5535 works for your 2015 Mercedes-Benz GL-Class and the wiring adapter you need is part # 3066-P. There are instructions included with the products to help you locate the plug under your dash. The plug is located in your foot well on the drivers side, there might be a plastic cover covering the connectors.
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  • Does Tekonsha Prodigy P3 Brake Controller go to Sleep When Not in Use
    Thank you for your purchase from etrailer of the Tekonsha Prodigy P3 Trailer Brake Controller # 90195. In regards to its use, the controller can be left plugged in as it will go into sleep mode after 15 minutes of not being used. You can certainly unplug it if you like, but leaving it plugged in will not drain the battery so you definitely do not have to do that if you don't like.
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  • Activating Brake Controller/Trailer Connector Feed on 2016 Mercedes-Benz GLE 350D Coupe
    I'm assuming that you've already installed the Tekonsha P3 # 90195 and it's not powering up, is that correct? You'll want to first ensure that you're using the correct brake controller wiring adapter, part # 3066-P which is compatible with Tekonsha and Draw-Tite brake controllers. If you're using the correct brake controller wiring harness, the most likely reason the controller isn't powering up is a missing fuse. I've looked at the owner's manual, which states that in the fuse box under...
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  • Is There a Brake Controller Adapter Harness for a 2020 Mercedes GLE 450
    I do have an option for the 2020 Mercedes-Benz GLE 450 in the Curt Echo Mobile Trailer Brake Controller part # C51180 which is a completely plug and play option. Furthermore, the Curt Echo uses your phone so you don't have to drill into the dash to mount the controller like you would for a conventional brake controller. That said, none of the brake controller manufactures have confirmed a brake controller adapter harness for a 2020 Mercedes-Benz GLE 450 as of December 2019. I cannot confirm...
    view full answer...
  • Parts Needed to Install Prodigy P3 # 90195 in 2017 Mercedes Benz GLE
    The Prodigy P3 part # 90195 is a really great controller and would be what I would recommend highly for your 2017 Mercedes Benz GLE and all you'd need to install it is the part # 3066-P and you'd be set. No other changes would need to be made.
    view full answer...
  • Brake Controller Blows Fuse When Plugged Into 2012 Mercedes-Benz ML350
    It's difficult to say, having not seen what you have going on in person but if I had to hazard a guess, I'd say that you're using the wrong brake controller wiring harness. To install the # TK90160 Tekonsha Primus in your 2012 Mercedes ML350, you'll want to use the # 3066-P wiring harness. This would explain the fuse popping as soon as the controller is plugged in.
    view full answer...
  • Recommended Brake Controller For A 2019 Mercedes-Benz GLE
    When it comes to installing a brake controller on your 2019 Mercedes Benz GLE with a tow package, I recommend The Tekonsha Voyager Trailer Brake Controller - 1 to 4 Axles - Proportional # 39510. Since your vehicle already has the 7 pin it does have an active brake line to run to the controller, but it wont carry the signal without the controller. This controller can be mounted within a 90-degree vertical range, so you can mount it away from your knee. With your trailer only being 5,000...
    view full answer...
  • Where Is the Brake Controller Plug On a 2016 Mercedes-Benz GLE 350
    In regards to installing a brake controller on a 2016 Mercedes-Benz GLE 350, we don't have any videos of this at this time. If you have the factory 7-way then it's as easy as plug-in-play, the Tekonsha Primus IQ Trailer Brake Controller part # TK90160 with Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers part # 3066-P is a great option. The harness will be located underneath the dash. Pull back the carpet behind the brake pedal to expose the connector. There will be a 4-pin...
    view full answer...
    Image 1 for
  • Recommended Brake Controller for a 2016 Mercedes-Benz GLE-Class 350D
    We do have a few different options for you to use a brake controller with your 2016 Mercedes-Benz GLE-Class 350D. If you have a factory 7-Way wiring connector on your GLE-Class 350 then you simply need the Plug-In Adapter # 3066-P for a Tekonsha controller like the Prodigy P3 # 90195 which installs on a connector that can be found under your driver's side dash behind that carpet that is behind your brake pedal. If your vehicle doesn't have the factory 7-Way then it has no plug-n-play...
    view full answer...
  • Plug-In Adapter for Installing Tekonsha Prodigy P3 on a 2016 Mercedes-Benz GLE-350
    The answer page that you are referring to was actually completed a few years ago and at the time nobody had a plug-in option for the brake controller. I had contact different manufacturers and they all said that it had to be hardwired. Since then, as you have found, a plug-in adapter has been found so all you need to install the Prodigy P3 # 90195 on your 2016 Mercedes-Benz GLE-350 is the Plug-In Adapter # 3066-P. This is the option you can go with if you have the factory 7-Way. If you...
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    Image 1 for
  • Best Trailer Brake Controller for 2014 Mercedes-Benz M-Class
    Yes, we recommend the Tekonsha Prodigy P3 Trailer Brake Controller # 90195 for your M-Class often. If your vehicle has a 7-way trailer connector the installation will also require the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers # 3066-P. Installing the P3 consists of only mounting the main unit on the trailer, plugging in the hand-held display in the passenger compartment and pairing the two. The linked video will show you the P3 installation process in another brand...
    view full answer...
  • Parts Needed To Install Redarc Tow-Pro Elite Trailer Brake Controller On 2017 Mercedes-Benz GLE
    In order to install the Redarc Tow-Pro Elite Trailer Brake Controller part # RED44FR on a 2017 Mercedes-Benz GLE with tow package you will only need the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers part # 3066-P and Redarc Tow-Pro Wiring Adapter for Tekonsha Brake Controller Harness part # 331-TPH-017 which makes for a plug and play install. The Tow-Pro Elite is the best model available with both user and proportional braking modes.
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  • Brake Controller Pin vs 12V Power Pin for 7-Way on 2016 Mercedes-Benz GLE 350
    The 12V power that you are referring to is actually on a different circuit than what your Prodigy P3 # 90195 and the Adapter # 3066-P will be sending power on. The 12V power is constant and is the pin in the 2 o'clock position while the brake controller will only send power when the brake pedal is pressed (while you're traveling) or if you apply the brakes with the manual override. The pin for the brake controller is in the 5 o'clock position for the 7-Way connector on your 2016 Mercedes-Benz...
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    Image 1 for
  • 2017 Mercedes-Benz GLE Brake Controller Recommendation
    For your 2017 Mercedes-Benz GLE 43 I recommend using the Redarc Tow-Pro Elite Trailer Brake Contoller # RED44FR as this will give you a very clean finished product that won't take up a lot of space. From the pictures I could find of your interior I recommend installing in the blank cover to the right of the headlight switch if that is available. To complete the installation you will need the Tekonsha Plug-In Wiring Adapter # 3066-P and Redarc Tow-Pro Wiring Adapter # 331-TPH-017. These...
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  • There Power Light On the Curt Echo Has Stopped Working on a 2016 Mercedes GL350
    Congrats on your daughter winning first place and the Wild Card entrance to the National Barrel Race Championships! I definitely want to make sure you are up and running so you can continue her on her winning streak, so lets get into it. With that said, there is one thing to double check before the more intense stuff. That being, if the trailer was not plugged into Echo # C51180 after it was plugged into your vehicle, there may not have been enough load for the vehicle to recognize a trailer....
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  • Brake Controller Installation for 2016 Mercedes GL350 With Factory Tow Package
    While there isn't a video for installing a brake controller in your 2016 Mercedes GL 350, since you have the factory tow package and a 7-way you can easily install the Redarc Tow-Pro Elite Trailer Brake Controller # RED44FR or Tekonsha Prodigy P3 Trailer Brake Controller # 90195. To do so all you'd need is the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers # 3066-P. As you can see by the cut out of the linked installation instructions, this adapter will mate to the electric...
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    Image 1 for
  • What Parts Are Needed To Install a Brake Controller on a 2011 Mercedes GL-450 With Factory 7-Way?
    You will need to confirm that there is a factory brake controller connector on your 2011 Mercedes GL-450. You will need to lower the bottom dash panel that is located below your steering wheel. Behind the panel you may have a green 4 prong connector that the Tekonsha Plug-In Wiring Adapter # 3066-P will connect to. If you locate this connector the Redarc Tow-Pro Wiring Adapter # 331-TPH-017 can be used to connect the Tekonsha pigtail to the Redarc Tow-Pro Elite Trailer Brake Controller...
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  • Parts Needed to Install Brake Controller in 2020 Mercedes Benz GLS
    If your 2020 Mercedes Benz GLS has the factory 7-way you can easily install the Redarc Tow Pro Elite part # RED44FR with just the install harness part # 3066-P. If you do not have a 7-way you'd have to install a 4-way like part # 119190KIT with the 7-way adapter # ETBC7 so that you could install a wireless brake controller like the Curt Echo Mobile # C51180. To find someone to do the install best option is to find a local mechanic to you with a good reputation and let them tackle the...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Alexander C
Written by:
Alexander C

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