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2019 - 2021 Hyundai Tucson
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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: | 118812 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 1.85 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: | YES |
| 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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1 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2019 - 2021 | Hyundai Tucson | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
Yes, the 2019-2021 Hyundai Tucson Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118812 (Part #TK118812) is designed to fit the 2019-2021 Hyundai Tucson.
The 2019-2021 Hyundai Tucson Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118812 (Part #TK118812) fits 2019-2021 Hyundai Tucson models. The 2021 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2019-2021 Hyundai Tucson Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118812 (Part #TK118812) fits the following vehicles: 2019-2021 Hyundai Tucson. Always verify your specific year, make, and model before ordering.
The 2019-2021 Hyundai Tucson Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118812 (Part #TK118812) Drilling is required for installation. Basic hand tools are typically all you need.
The T-Connector is a wiring adapter that integrates a vehicle's taillight wiring with trailer towing circuits. It allows you to connect a trailer to your vehicle's electrical system by splicing into the existing taillight connectors on both the driver's and passenger's sides, and routing power from the vehicle battery through a fused connection to the trailer.
The manual shows installation on a Hyundai Tucson as an example. The manual does not provide a complete compatibility list. Contact the manufacturer or check the product packaging to confirm fitment for your specific vehicle make, model, and year.
You will need: trim panel remover, 10 mm socket and ratchet or 10 mm wrench, drill with 3/32" drill bit, fish tape, test-probe, and utility knife. You will also need a hot air gun or similar heat source for the butt connector splice (step 7), and silicone rubber (not provided) if your vehicle has an existing wire passing through the grommet (step 4).
The kit includes: two T-Connector harness ends (one with yellow/brown wires, one with green/red wires), a yellow fuse holder with fuse, a yellow butt connector, a white eyelet and screw for grounding, double-sided tape for mounting the black box, cable ties for securing harness, and a 4-flat connector for storage in the spare tire compartment when not in use.
The manual does not explicitly state whether the battery must be disconnected. However, it does instruct you to attach the ring terminal to the vehicle's positive battery cable (step 7) and emphasizes reading and following all warnings on the battery. Consult your vehicle's owner's manual and the battery warnings before beginning installation.
You must open the tailgate and remove both vehicle taillight assemblies to access the wiring harness connectors behind them (step 1). Inside the rear cargo area, temporarily remove all floor coverings, cargo trays, and the plastic threshold cover (step 3). Do not remove vehicle side trim panels, as this risks breaking the clips that hold them to the vehicle.
Remove the grommet under the vehicle on the driver's side and use fish tape to pull both T-Connector ends and the power wire through the grommet hole from inside the vehicle behind the driver's side trim panel and seat grommet (step 4). Route the yellow/brown connector end up into the driver's side taillight pocket (step 5). Route the green/red connector end up over the bumper bracket, across the bumper, and into the passenger's side taillight pocket, securing it with cable ties while avoiding hot pipes, heat shields, and areas that may damage the wire (step 6).
Disconnect the vehicle wiring harness from both taillight sockets, ensuring all connector surfaces are clean and free of dirt (step 2). Starting on the driver's side, plug the T-Connector harness containing the yellow wire in between the vehicle's mating connectors, ensuring the connectors are fully inserted with locking tabs in place (step 5). Repeat this process on the passenger's side using the T-Connector containing the green wire (step 6).
Remove the fuse from the yellow fuse holder (if not already removed). Cut the fuse holder wire and attach the ring terminal to the vehicle's positive (+) battery cable. Connect the other end of the fuse holder to the black 12 gauge wire using the yellow butt connector provided (step 7). Route the black 12 gauge wire rearward along the frame rail from the front of the vehicle, avoiding hot pipes, heat shields, fuel tank, and points that may pinch or break the wire. Locate the red 12 gauge power wire exiting the grommet under the vehicle and connect the black wire to it using the butt connector provided. Apply heat directly to the splice using a hot air gun or similar source, working from the center out to the edges, until the tubing recovers and the adhesive flows (step 7).
Locate a suitable grounding point near the connector, such as an existing ground stud, or drill a 3/32" hole and secure the white wire using the eyelet and screw provided (step 8). Do not drill into the vehicle floor or bed. Clean dirt and rustproofing from the area before securing the ground connection.
Mount the T-Connector black box on the driver's side using the double-sided tape provided (step 10). Secure the remainder of the T-Connector harness with the cable ties provided to prevent damage, rattling, and to avoid areas that would cut or pinch the wire.
Drilling is required only if you do not have an existing ground stud near the connector. You will need to drill a 3/32" hole to secure the white ground wire using the eyelet and screw provided (step 8). Do not drill into the vehicle floor or bed. Before drilling, verify what is behind any surface to avoid damage to the vehicle and personal injury. Do not drill into any exposed surfaces.
If your vehicle has a wire passing through the existing grommet, unseat the grommet and leave it attached. Carefully slit the provided T-Connector's grommet as shown in the manual to allow the existing vehicle wire to pass through. Add silicone rubber (not provided) to seal the grommet (step 4, Note).
The T-Connector has two harness ends: one with yellow/brown wires (driver's side) and one with green/red wires (passenger's side). These connect to the vehicle's taillight connectors. The kit also includes a black 12 gauge power wire that connects to the vehicle's positive battery through a yellow fuse holder, a white ground wire, and a red 12 gauge power wire that exits the grommet under the vehicle.
The manual includes a yellow fuse holder with a fuse, but does not specify the amperage rating. Remove the fuse if not already removed, cut the fuse holder wire, and attach the ring terminal to the vehicle's positive (+) battery cable. Connect the other end of the fuse holder to the black 12 gauge wire using the yellow butt connector provided (step 7). Refer to the product packaging or manufacturer for the specific fuse amperage rating.
Always wear safety glasses and use all safety precautions during installation. Do not remove vehicle side trim panels, as this risks breaking the clips that hold them to the vehicle. Before drilling, verify what is behind any surface to avoid damage to the vehicle and personal injury. Do not drill into exposed surfaces. Route all wires away from hot pipes, heat shields, fuel tank, and areas that may pinch or break the wire. Do not exceed the stated product amperage ratings or the towing manufacturer rating stated in your vehicle's owner's manual, as overloading circuits can cause fires.
All connections must be complete for the T-Connector to function properly. Test and verify the installation with a test light or by connecting a trailer once installed (step 9). Ensure all connectors are fully inserted with locking tabs in place, the ground connection is secure, and the power connection is complete before testing.
Reinstall the plastic trim panels, threshold, storage covers, floor covering, and other items that were removed during installation, being careful not to pinch or cut the wires (step 11). Store the 4-flat connector in the spare tire compartment when not in use.
The 4-flat connector is included with the T-Connector kit for use when connecting a trailer. When the T-Connector is not in use, store the 4-flat connector in the spare tire compartment of your vehicle (step 11).
The manual shows installation on a Hyundai Tucson. For compatibility with your specific vehicle make, model, and year, contact the manufacturer or check the product packaging.
Use a 3/32" drill bit to create the hole for the ground wire eyelet and screw (step 8).
The power connection uses 12 gauge wire: a black 12 gauge wire from the fuse holder routed along the frame rail, and a red 12 gauge power wire exiting the grommet under the vehicle (step 7).
Do not exceed the stated product amperage ratings or the towing manufacturer rating in your vehicle's owner's manual. Overloading circuits can cause fires. Wear safety glasses during installation and verify what is behind any surface before drilling.
The manual states that all connections must be complete for the T-Connector to function properly (step 9). Verify the following: (1) Both T-Connector harness ends are fully inserted into the vehicle's taillight connectors with locking tabs in place (steps 5–6); (2) The power connection from the battery through the fuse holder to the black 12 gauge wire is complete and the butt connector splice is properly heated and sealed (step 7); (3) The ground connection is secure and the area is clean (step 8); (4) All connector surfaces are clean and free of dirt (step 2). Test with a test light or trailer to verify proper function.
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May 22, 2023
