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Tekonsha
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2024 - 2025 Toyota Grand Highlander
Confirmed to Fit
2020 - 2025 Toyota Highlander
Confirmed to Fit
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Tekonsha T-One connector (also referred to as T-Connector) wiring harnesses are the fastest and easiest way to add an electrical connector to the back of your vehicle. These connectors are used to link the wiring from your vehicle to the trailer when towing. Tekonsha T-One connectors feature custom designs to fit each vehicle make and model based on manufacturer specifications. Plus, the Plug & Play connectors on the end of the wires make it easy to install. No cutting or splicing!
Tekonsha offers the largest, most complete line of T-One connectors. To install a Tekonsha T-One wiring harness, simply locate your vehicle's wiring harness connector typically behind the vehicle taillight - unplug the connection and insert the T-Connector into the vehicle's harness. It's that easy! So what are you waiting for? Hit the road with the peace of mind only Tekonsha can provide. Life's a Journey. Stop Often.
| BRAND: | TEKONSHA |
| PART NUMBER: | 118827 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 0.75 LBS |
| UNIVERSAL OR SPECIFIC FIT: | SPECIFIC |
| CIRCUIT PROTECTED: | YES |
| HARNESS TYPE: | MALE FEMALE |
| TERMINAL QUANTITY: | 4 |
| WIRE COLORS: | BROWN, GREEN, YELLOW, WHITE |
| WIRE QUANTITY: | 4 |
| WIRE GAUGE: | 16 GA. |
| POWER LEAD REQUIRED: | NO |
| ELECTRICAL SYSTEM TYPE: | 3-WIRE SYSTEM |
| HARDWARE INCLUDED: | YES |
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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2 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2024 - 2025 | Toyota Grand Highlander | Tow Harness T: Connector Assembly Uses all existing holes. No Drilling required Install Time is 30 minutes |
| 2020 - 2025 | Toyota Highlander | Tow Harness T: Connector Assembly Uses all existing holes. No Drilling required Install Time is 30 minutes |
The 2020-2023 Toyota Highlander Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118827 (Part #TK118827) fits the following vehicles: 2024-2025 Toyota Grand Highlander; 2020-2025 Toyota Highlander. Always verify your specific year, make, and model before ordering.
Yes, the 2020-2023 Toyota Highlander Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118827 (Part #TK118827) is designed to fit the 2024-2025 Toyota Grand Highlander.
The 2020-2023 Toyota Highlander Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118827 (Part #TK118827) fits 2024-2025 Toyota Grand Highlander models. The 2025 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2020-2023 Toyota Highlander Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118827 (Part #TK118827) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
The T-Connector is a T-One® T-Connector that interfaces between your vehicle's tow harness and a trailer connector. It allows you to connect a trailer to your vehicle's electrical system. The system includes a 10-pin modulite adapter that connects to your vehicle's internal tow plug, a 6-pin tow-plug adapter that connects to the external trailer harness under the vehicle, and a 4-flat end connector for the trailer itself.
The manual shows a Toyota Highlander as an example application and describes locating the 10-pin tow plug on the driver's side behind the trim panel near the rear seat belt bracket/coil. However, the manual does not explicitly confirm fitment for all Highlander model years or trim levels. Verify that your vehicle has a 10-pin tow plug in the location described (driver's side rear, behind trim panel) before purchasing.
The manual does not provide a comprehensive list of compatible vehicles. It shows a Toyota Highlander as an example and describes installation for vehicles with a 10-pin tow plug located on the driver's side behind the trim panel near the rear seat belt bracket/coil, and a 6-pin tow-plug adapter under the vehicle behind the rear bumper on the driver's side. Contact the manufacturer or check the product fitment database to confirm compatibility with your specific vehicle.
You will need a trim panel remover and a test-probe. These are listed as required tools at the beginning of the installation instructions.
The manual confirms that cable ties are provided for securing the harness. A bracket or electrical box for mounting the 4-flat end is not included and must be sourced separately. The manual does not provide a complete parts list for all included components.
The 10-pin tow plug is located on the driver's side behind the trim panel near the rear seat belt bracket/coil. To access it, open the driver's side rear door, locate the cup holder and carefully pry it away from the side trim panel, then use a trim panel puller to carefully partially pull the trim panel back to expose the area near the seat belt bracket/coil.
Locate the 10-pin tow plug on the driver's side behind the trim panel near the seat belt bracket/coil. Check that the mating surfaces of the vehicle harness connectors match the 10-pin tow plug adapter ends. Insert the 10-pin tow plug adapter and lock it into place. Be careful not to damage the locking tabs and ensure that the connectors are fully inserted with locking tabs in place.
Route the remaining harness behind the trim panel and to the opening area from the removed cup holder. Locate a flat surface in an out-of-the-way place and mount the T-One® T-Connector's black box-module to prevent damage or rattling.
The trailer harness connector is located under the vehicle, behind the rear bumper, on the driver's side of the vehicle.
Locate the tow vehicle's trailer harness connector under the vehicle behind the rear bumper on the driver's side. Remove the protective cap from the connector and store it in the glove compartment along with the installation instructions. Check that the mating surfaces of the connectors are free of dirt and clean if necessary. Insert the 6-pin tow-plug adapter and lock it into place. Ensure that the connectors are fully inserted with locking tabs in place.
Route the T-Connector harness rearward to the back of the fascia of the bumper. Secure the remainder of the T-One® Connector harness with the cable ties provided to prevent damage or rattling. Be careful to avoid any areas that would pinch, cut, or melt the wire.
Mount the 4-flat end in an accessible location with a bracket or electrical box. The bracket or electrical box is not included and must be sourced separately.
Always wear safety glasses and use all safety precautions during installation. Read and follow all warnings and instructions included with the product before beginning installation. Keep the instructions for future reference. Read, understand, and follow all warnings and instructions printed on the tow vehicle's battery. Do not exceed the lower of the towing manufacturer rating (including in your vehicle owner's manual) or the specific amperage ratings stated on the product.
Overloading circuits can cause fires. Do not exceed the stated product ratings. Do not exceed the lower of the towing manufacturer rating (including in your vehicle owner's manual) or the specific amperage ratings stated on the product. Read your vehicle's owner's manual and instruction sheet for additional information.
All connections must be complete for the T-One® Connector to function properly. Test and verify the installation with a test light or trailer once installed. For the initial test, reset the vehicle electrical system by temporarily removing the key from the ignition.
Store the protective cap in the glove compartment along with the installation instructions.
The manual shows a Toyota Highlander as an example. Your vehicle must have a 10-pin tow plug on the driver's side behind the trim panel near the rear seat belt bracket/coil, and a 6-pin tow-plug adapter under the vehicle behind the rear bumper. Verify these connectors exist before purchasing.
The manual does not mention drilling, cutting, trimming, grinding, welding, or bending. Installation involves removing a cup holder trim panel, accessing existing connectors, and routing harness with provided cable ties.
Overloading circuits can cause fires. Do not exceed the stated product ratings or the lower of the towing manufacturer rating in your vehicle owner's manual or the specific amperage ratings on the product. Always wear safety glasses during installation.
Test and verify the installation with a test light or trailer once installed. All connections must be complete. For the initial test, reset the vehicle electrical system by temporarily removing the ignition key.
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May 22, 2023
