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2019 - 2025 Volvo XC40
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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: | 118792 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 1.65 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 - 2025 | Volvo XC40 | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
The 2019-2023 Volvo XC40 Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118792 (Part #TK118792) fits 2019-2025 Volvo XC40 models. The 2025 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2019-2023 Volvo XC40 Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118792 (Part #TK118792) fits the following vehicles: 2019-2025 Volvo XC40. Always verify your specific year, make, and model before ordering.
Yes, the 2019-2023 Volvo XC40 Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118792 (Part #TK118792) is designed to fit the 2019-2025 Volvo XC40.
The 2019-2023 Volvo XC40 Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118792 (Part #TK118792) Drilling is required for installation. Basic hand tools are typically all you need.
Yes, the T-One® Connector part 118792-037 is designed for the Volvo XC40. The installation instructions are specific to this vehicle model.
The T-One® Connector is a trailer wiring harness that connects to your vehicle's tail light wiring to provide power for trailer lights. It includes a black box module that mounts inside the vehicle, connector ends that tap into the factory tail light wiring on both driver and passenger sides, and a power wire that connects to the vehicle battery.
Required tools are: trim panel remover, 10 mm socket and ratchet (or 10 mm wrench), 8 mm socket and ratchet (or 8 mm wrench), drill with 3/32" drill bit, wire crimpers, wire cutters, Phillips head screwdriver, and test probe.
The kit includes: the T-One® Connector black box, connector ends with yellow and green wires, a black 12 ga. power wire, double-sided tape for mounting the black box, cable ties for securing the harness, a white ground wire with eyelet and screw, a yellow fuse holder with 15 amp fuse, a yellow butt connector, and a ring terminal.
Yes. You must disconnect the vehicle's negative (−) battery cable before connecting the power wire to the positive battery terminal. This is done in step 9. After all connections are complete, you reconnect the negative battery cable in step 11.
Open the rear hatch, then unlatch and remove the rear floor section. Remove 10 bolts from the side panel supports and threshold using an 8 mm socket. Pull back the side panels to access the tail light wiring harness.
On the driver's side, insert the T-One® Connector end with the yellow wire between the vehicle wiring connectors and lock into place. Be careful not to damage the locking tabs and ensure connectors are fully inserted with locking tabs in place. Repeat on the passenger's side with the connector end containing the green wire, routing it down the threshold first.
Mount the black box on the driver's side using the double-sided tape provided. Secure the remainder of the harness with cable ties to prevent damage or rattling, being careful to avoid areas that would cut or pinch the wire.
Drilling is required only if a suitable existing ground point (such as a ground stud) is not available near the connector. If drilling is necessary, drill a 3/32" hole for the white ground wire. Do not drill into the vehicle floor or bed. Always verify what is behind any surface before drilling to avoid damage to the vehicle or personal injury.
Locate a suitable grounding point near the connector, such as an existing ground stud. If one is not available, drill a 3/32" hole and secure the white ground wire using the eyelet and screw provided. Clean dirt and rustproofing from the area before securing. Do not drill into the vehicle floor or bed.
Locate the black 12 ga. power wire from the T-One® Connector box on the driver's side. Route the black 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, avoid hot pipes, heat shields, the fuel tank, and other points that may pinch or break the wire.
Disconnect the vehicle's negative (−) battery cable first. Remove the fuse from the yellow fuse holder if not already removed. Cut the fuse holder wire, attach the ring terminal, and secure it to the vehicle's positive (+) battery cable. Connect the other end of the fuse holder to the black 12 ga. wire using the yellow butt connector provided. Then reconnect the negative battery cable and install the 15 amp fuse into the fuse holder.
Use a 15 amp fuse. The yellow fuse holder with a 15 amp fuse is provided in the kit. Install it in step 11 after reconnecting the negative battery cable.
After all connections are 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.
Secure the remainder of the T-One® Connector harness with the cable ties provided to prevent damage or rattling, being careful to avoid areas that would pinch, cut, or melt the wire. Then 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.
Store the 4-flat connector in the rear cargo area when not in use.
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. The manual does not specify the exact amperage rating of this connector; refer to the product label or contact the manufacturer for this information.
Always wear safety glasses and use all safety precautions during installation. Read and follow all warnings and cautions printed on the tow vehicle's battery. Verify what is behind any surface before drilling. Do not drill into exposed surfaces. Avoid hot pipes, heat shields, fuel tank, and pinch points when routing wires. Do not exceed product ratings to avoid overloading circuits, which can cause fires.
Yes, part 118792-037 is designed specifically for the Volvo XC40.
You need: trim panel remover, 10 mm and 8 mm sockets/wrenches, drill with 3/32" bit, wire crimpers and cutters, Phillips screwdriver, and test probe.
Drilling is required only if no existing ground stud is available. If needed, drill a 3/32" hole for the ground wire. Do not drill into the vehicle floor or bed.
Yes, disconnect the negative battery cable before connecting the power wire to the positive terminal. Reconnect it after all connections are complete.
Use a 15 amp fuse, which is provided in the yellow fuse holder.
Test with a test light or trailer after all connections are complete. Reset the electrical system by temporarily removing the ignition key.
Verify that all connections are complete. Ensure the connector ends are fully inserted into the vehicle wiring connectors with locking tabs fully engaged on both driver and passenger sides. Check that the black power wire is properly connected to the positive battery terminal via the fuse holder and yellow butt connector. Verify the 15 amp fuse is installed in the fuse holder. Test with a test light or trailer. If still not working, reset the vehicle electrical system by temporarily removing the ignition key.
Ensure you are inserting the connector ends fully between the vehicle wiring connectors. The locking tabs must be fully engaged. Be careful not to damage the locking tabs during insertion. If the tabs appear damaged, the connector may not lock properly and should be inspected or replaced.
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Ordered online. Shipment arrived on time and with all the correct parts. Great customer service and friendly staff. Also, pricing was great!
May 22, 2023
Total for 4 items:
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