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2020 - 2023 Hyundai Sonata
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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: | 118819 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 1.5 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: | 2-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 |
|---|---|---|
| 2020 - 2023 | Hyundai Sonata | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
The 2020-2023 Hyundai Sonata Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118819 (Part #TK118819) fits the following vehicles: 2020-2023 Hyundai Sonata. Always verify your specific year, make, and model before ordering.
Yes, the 2020-2023 Hyundai Sonata Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118819 (Part #TK118819) is designed to fit the 2020-2023 Hyundai Sonata.
The 2020-2023 Hyundai Sonata Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118819 (Part #TK118819) fits 2020-2023 Hyundai Sonata models. The 2023 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2020-2023 Hyundai Sonata Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118819 (Part #TK118819) Drilling is required for installation. Basic hand tools are typically all you need.
The T-One® Connector is a T-shaped wiring harness that integrates a vehicle's taillight wiring with trailer towing circuits. It connects between the vehicle's existing taillight connectors on both the driver and passenger sides, allowing the vehicle's electrical system to control trailer lights. The connector includes a black box-module that houses the integration electronics and must be mounted in a flat, out-of-the-way location to prevent damage or rattling.
The manual does not specify which vehicles are compatible with this connector. The installation instructions show a Hyundai Sonata as an example, but do not state whether the product is universal or model-specific. Before purchasing, contact the manufacturer or check the product fitment database to confirm compatibility with your vehicle. The connector requires accessible taillight wiring harnesses on both driver and passenger sides that match the T-Connector ends.
Required tools are: trim panel remover, 10 mm socket and ratchet or 10 mm wrench, drill with 3/32" drill bit, 1/4" socket, wire crimpers, wire cutters, Phillips head screwdriver, and test-probe. These tools are needed to remove interior panels, disconnect and reconnect taillight connectors, drill the grounding hole, crimp and cut wires, and test the installation.
The kit includes: two T-Connector ends (one with yellow wire for driver side, one with green wire for passenger side), a black 12 ga. power wire, a white ground wire with eyelet and screw, a yellow fuse holder with 15 amp fuse, a yellow butt connector, cable ties, and a 4-Flat connector for storage in the trunk when not in use.
Yes. You must disconnect the vehicle's negative (−) battery cable before connecting the black 12 ga. power wire to the positive (+) battery terminal. This is a critical safety step to prevent electrical shock or short circuits. After all connections are made, reconnect the negative battery cable and install the 15 amp fuse into the fuse holder.
You must open the trunk, temporarily remove the rear threshold plate, and partially remove the felt trunk liner behind the taillights to access the taillight wiring harnesses on both sides. After installation, all panels, clips, and carpet must be replaced carefully to avoid cutting or pinching the wires.
On the driver side, insert the T-Connector end with the yellow wire between the vehicle's taillight wiring connectors and lock into place, being careful not to damage the locking tabs. Route the T-Connector end with the green wire to the passenger side behind the panels and along the threshold, then plug it between the mating plugs on the passenger side taillight socket and vehicle wiring harness. Ensure all connector surfaces are clean and free of dirt before connecting, and verify that connectors are fully inserted with locking tabs in place.
Yes, drilling is required. You must drill a single 3/32" hole in a suitable grounding point near the connector, such as the vehicle's frame or crossmember. Do not drill into the vehicle floor or bed. Before drilling, clean dirt and rustproofing from the area and verify what is behind the surface to avoid damage to the vehicle or personal injury. Do not drill into any exposed surfaces. The white ground wire is secured to this hole using the eyelet and screw provided.
Route the black 12 ga. power wire along the exterior frame or follow existing wiring along the thresholds into the engine compartment up to the battery. Avoid areas that may pinch or break the wire. If routing through a grommet and along the exterior of the vehicle, carefully avoid hot pipes, heat shields, the fuel tank, or any other points that may pinch or break the wire. The wire must reach the vehicle's positive (+) battery terminal where it connects via the yellow fuse holder.
The T-One® Connector uses a 15 amp fuse. The fuse is housed in a yellow fuse holder provided with the kit. After disconnecting the vehicle's negative battery cable, attach the ring terminal from the fuse holder to the vehicle's positive (+) battery cable. Connect the other end of the fuse holder to the black 12 ga. power wire using the yellow butt connector provided. After all connections are complete, reconnect the negative battery cable and install the 15 amp fuse into the fuse holder.
The T-Connector uses four wire colours: yellow wire (driver side taillight connection), green wire (passenger side taillight connection), black 12 ga. wire (power from battery), and white wire (ground connection to vehicle frame or crossmember). Each wire has a specific function in the taillight integration circuit.
Mount the black box-module on a flat surface in an out-of-the-way location to prevent damage or rattling. The module should be secured in a place where it will not be disturbed during normal vehicle use or trunk access.
Secure the remainder of the T-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. After securing the harness, replace all carpet, clips, and panels that were removed during installation, taking care not to cut or pinch the wires.
After installation is complete, test and verify the installation with a test light or trailer. For the initial test, reset the vehicle electrical system by temporarily removing the key from the ignition. All connections must be complete for the T-One® Connector to function properly. If using a test light, probe the trailer connector pins to verify that the correct circuits are active.
The manual states that you must not exceed the lower of the towing manufacturer's rating (including in your vehicle owner's manual) or the specific amperage ratings stated on the product. The connector uses a 15 amp fuse. Overloading circuits can cause fires. Always read the vehicle's owner's manual and the T-Connector instruction sheet for additional information on amperage limits.
Always wear safety glasses during installation. Before drilling, verify what is behind any surface to avoid damage to the vehicle or personal injury. Do not drill into exposed surfaces. When routing the power wire, avoid hot pipes, heat shields, the fuel tank, and any areas that may pinch or break the wire. Read and follow all warnings printed on the vehicle's battery before connecting to the battery terminals. Disconnect the negative battery cable before connecting to the positive terminal.
Store the 4-Flat connector in the trunk area when not in use. This protects it from damage and keeps it accessible for future use.
The manual does not specify which vehicles are compatible. Contact the manufacturer or check a fitment database with your vehicle's year, make, and model. The connector requires accessible taillight wiring harnesses on both driver and passenger sides.
You need: trim panel remover, 10 mm socket/ratchet or wrench, drill with 3/32" bit, 1/4" socket, wire crimpers, wire cutters, Phillips screwdriver, and test-probe.
Yes, you must disconnect the negative battery cable before connecting the power wire to the positive battery terminal. Reconnect it after all connections are complete and the fuse is installed.
Yes, you must drill one 3/32" hole in the vehicle's frame or crossmember for the ground wire. Do not drill into the floor or bed. Always verify what is behind the surface before drilling.
The T-One® Connector uses a 15 amp fuse in the yellow fuse holder provided with the kit.
Do not exceed the lower of the towing manufacturer's rating or the specific amperage ratings stated on the product. Overloading circuits can cause fires.
Verify that all connections are complete. Check that the yellow T-Connector end is fully inserted and locked on the driver side, the green T-Connector end is fully inserted and locked on the passenger side, the white ground wire is securely attached to the frame or crossmember with the eyelet and screw, the black power wire is connected to the vehicle's positive battery terminal via the yellow fuse holder, and the 15 amp fuse is installed in the fuse holder. Reset the vehicle electrical system by temporarily removing the ignition key. Test with a test light or trailer to verify proper operation.
Ensure that all connector surfaces are clean and free of dirt before connecting. Verify that you are inserting the connectors fully between the vehicle's taillight wiring connectors. Be careful not to damage the locking tabs during insertion. If the connectors still do not lock, the locking tabs may be damaged or the connectors may not be compatible with your vehicle's taillight connectors.
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