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2012 - 2016 Mercedes-Benz GL350
Confirmed to Fit
2012 - 2016 Mercedes-Benz GL450
Confirmed to Fit
2012 - 2015 Mercedes-Benz GL550
Confirmed to Fit
2016 - 2023 Mercedes-Benz GLE350
Confirmed to Fit
2017 - 2020 Mercedes-Benz GLE43 AMG
Confirmed to Fit
2016 - 2017 Mercedes-Benz GLE550
Confirmed to Fit
2016 - 2020, 2022 Mercedes-Benz GLE63 AMG
Confirmed to Fit
2017 - 2023 Mercedes-Benz GLS450
Confirmed to Fit
2017 - 2019 Mercedes-Benz GLS550
Confirmed to Fit
2017 - 2019, 2021 - 2023 Mercedes-Benz GLS63 AMG
Confirmed to Fit
2015 Mercedes-Benz ML250
Confirmed to Fit
2012 - 2015 Mercedes-Benz ML350
Confirmed to Fit
2015 Mercedes-Benz ML400
Confirmed to Fit









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Tekonsha trailer brake controller harnesses exist to make connecting your brake controller to your vehicle as easy as possible. These custom two-plug units are specifically designed to be used with any Tekonsha brake controller. The Plug & Play feature on the Tekonsha wiring harnesses makes them easy to install. Simply plug one end of the harness into the back of your desired Tekonsha brake controller and the other end into the port in your vehicle. No cutting, splicing, or taping required.
Each wiring harness is made up of four copper wires wrapped with a braided nylon thread to insulate the wires and protect them against nicks, punctures, and elevated temperatures. The four-pin Plug & Play connectors on each end of the harness are uniquely designed, with one end to fit each vehicle based on make and model year specifications, while the other end plugs easily into any Tekonsha brake controller.
Tekonsha trailer brake controller harnesses are custom designed, giving you plenty of wire to reach between where it is connected to the vehicle and where it connects to the brake controller without stretching or straining the wires. And because Tekonsha is the leader in wiring and electrical, you can relax knowing your connections will be safe and secure, so you can hit the road with confidence! With Tekonsha, Lifes a Journey. Stop Often.
| BRAND: | TEKONSHA |
| PART NUMBER: | 306600 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 0.245 LBS |
| WIRE COLORS: | BLACK, RED, BLUE WHITE |
| CONNECTOR GENDER: | FEMALE |
| CONNECTOR SHAPE: | SQUARE |
| CONNECTOR QUANTITY: | 2 |
| TERMINAL QUANTITY: | 4 |
| TERMINAL TYPE: | BLADE |

Tekonsha is a leading manufacturer of electronic trailer brake controllers, pioneering the category in the 1970s. The lineup spans proportional units such as the Prodigy P3 and Prodigy iD, time-delayed controllers, the wireless Prodigy RF, plus vehicle-specific wiring harnesses, adapters and trailer brake components engineered for smooth, predictable stopping at any speed.
Tekonsha Engineering Company began in 1964 building RV steps and mirrors. Within a few years it had found its real calling, and by the 1970s Tekonsha was pioneering the manufacture of electronic trailer brake controllers, the product category that still defines the brand. More than half a century later it remains the reference name in trailer braking and is part of the Horizon Global group alongside Reese, Draw-Tite, Fulton, Bulldog and Wesbar.
A brake controller is the component that tells a trailer's electric brakes how hard to work and when, and getting that right is the difference between a controlled stop and a shove from behind. Tekonsha builds both major types. Proportional controllers use an internal accelerometer to sense how quickly the tow vehicle is slowing and apply trailer braking to match, so light braking stays light and hard braking is immediate. Time-delayed controllers ramp to a preset output over a fixed interval, a simpler and more economical approach that suits occasional towing.
The current brake controller range covers most of that ground. The Prodigy iD pairs with a phone through Tekonsha's EDGE technology for setup and monitoring, the P3 offers storable settings for multiple trailers and a trilingual colour LED display, the Prodigy P2 adds a dimmable display and boost mode for heavier loads, and the Voyager keeps operation simple and dependable. The Prodigy RF mounts to the trailer itself and controls wirelessly, which suits rental fleets and drivers who swap tow vehicles.
Installation is supported by vehicle-specific brake control harnesses that plug into a factory connector rather than requiring cut-and-splice wiring, along with mounting brackets and adapters. Matched controller bundles pair a unit with the correct harness. Products are tested to meet and often exceed published industry standards.
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The Tekonsha Trailer Brake Controller Custom Harness, Vehicle & Brake Control Ends 306600 (Part #TK306600) fits 2012-2016 Mercedes-Benz GL350 models. The 2023 model year is the last year covered by this part number. For newer models, check for an updated version.
Yes, the Tekonsha Trailer Brake Controller Custom Harness, Vehicle & Brake Control Ends 306600 (Part #TK306600) is designed to fit the 2012-2016 Mercedes-Benz GL350.
The Tekonsha Trailer Brake Controller Custom Harness, Vehicle & Brake Control Ends 306600 (Part #TK306600) fits the following vehicles: 2012-2016 Mercedes-Benz GL350; 2012-2016 Mercedes-Benz GL450; 2012-2015 Mercedes-Benz GL550; 2016-2023 Mercedes-Benz GLE350; 2017-2020 Mercedes-Benz GLE43 AMG; 2016-2017 Mercedes-Benz GLE550; Mercedes-Benz GLE63 AMG; 2017-2023 Mercedes-Benz GLS450; 2017-2019 Mercedes-Benz GLS550; 2017-2023 Mercedes-Benz GLS63 AMG; 2015 Mercedes-Benz ML250; 2012-2015 Mercedes-Benz ML350; 2015 Mercedes-Benz ML400. Always verify your specific year, make, and model before ordering.
The Tekonsha Trailer Brake Controller Custom Harness, Vehicle & Brake Control Ends 306600 (Part #TK306600) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
Yes, the 3066-037 Electric Trailer Brake Control Wiring Adapter is designed for Mercedes ML, GL, GLE SUV and GLS Series vehicles. The adapter connects to the vehicle's factory electric brake control harness located underneath the dash behind the brake pedal.
The 3066-037 is an Electric Trailer Brake Control Wiring Adapter that connects a trailer brake controller to your Mercedes vehicle's factory electric brake control system. It provides the interface between the aftermarket brake controller and the vehicle's 4-pin brake control harness connector located under the dash.
A trim panel remover is the only tool specified as required for installation. This tool is needed to access the vehicle's brake control harness located underneath the dash behind the brake pedal.
Before beginning installation, ensure the vehicle is completely off with the keys removed from the ignition. Always wear safety glasses during installation. Read and follow all warnings and instructions included with the brake control unit itself, as the adapter must be installed per the brake control manufacturer's specific instructions.
The vehicle's electric brake control harness is located underneath the dash. To access it, pull back the carpet behind the brake pedal to expose the 4-pin connector that mates with the adapter.
First, plug the brake control adapter into the mating receptacle on the backside of the brake control unit itself. Then, plug the adapter into the vehicle's 4-pin electric brake control harness connector located under the dash behind the brake pedal. This two-step connection prevents incorrect mating.
The adapter provides four connections: Trailer Brake Controller Output, Fused Trailer Brake Controller Battery Feed, Ground, and Vehicle Stop Lamp Switch to Brake Controller Input. The adapter housing contains female terminals on the wire side to accept the corresponding connections.
The adapter is rated for a maximum of 6 brakes (16 amps) on up to 3 axles. Do not exceed the lower of your towing manufacturer's rating (including the rating in your vehicle owner's manual) or this 16-amp specification. Overloading the circuit can cause fires.
Route the wires and mount the brake controller carefully to avoid airbag deployment locations and any other points that may pinch or break the wire. Locate a routing path for the adapter to exit the bottom of the dash. Complete all routing and mounting per the brake control manufacturer's specific installation instructions.
After installation, perform all test procedures as instructed by the brake control manufacturer. The manual requires that you complete the installation per the electric brake control manufacturer's instructions and mount the unit as directed, then perform the test procedures they specify.
The 3066-037 is designed for Mercedes ML, GL, GLE SUV and GLS Series vehicles. It connects to the factory electric brake control harness under the dash.
You need a trim panel remover to access the brake control harness under the dash.
The manual does not specify battery disconnection. It requires only that the vehicle be off with keys removed from the ignition before beginning installation.
The adapter is rated for a maximum of 6 brakes (16 amps) on up to 3 axles. Do not exceed the lower of your towing manufacturer's rating or this specification.
First plug the adapter into the mating receptacle on the backside of the brake control unit, then plug it into the vehicle's 4-pin harness connector under the dash.
The adapter provides Trailer Brake Controller Output, Fused Trailer Brake Controller Battery Feed, Ground, and Vehicle Stop Lamp Switch to Brake Controller Input connections.
13 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2012 - 2016 | Mercedes-Benz GL350 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2012 - 2016 | Mercedes-Benz GL450 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2012 - 2015 | Mercedes-Benz GL550 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2016 - 2023 | Mercedes-Benz GLE350 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2017 - 2020 | Mercedes-Benz GLE43 AMG | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2016 - 2017 | Mercedes-Benz GLE550 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2016 - 2020, 2022 | Mercedes-Benz GLE63 AMG | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2017 - 2023 | Mercedes-Benz GLS450 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2017 - 2019 | Mercedes-Benz GLS550 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2017 - 2019, 2021 - 2023 | Mercedes-Benz GLS63 AMG | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2015 | Mercedes-Benz ML250 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2012 - 2015 | Mercedes-Benz ML350 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
| 2015 | Mercedes-Benz ML400 | Trailer Brake Control Harness Uses all existing holes. No Drilling required Install Time is 10 minutes Custom 2: plug harness designed to plug directly into your vehicle and brake control Comes in attractive packaging for retail shelf |
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