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2018 - 2024 Alfa Romeo Stelvio
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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: | 118777 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 1.55 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 |
|---|---|---|
| 2018 - 2024 | Alfa Romeo Stelvio | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
The 2018-2024 Alfa Romeo Stelvio Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118777 (Part #TK118777) fits 2018-2024 Alfa Romeo Stelvio models. The 2024 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2018-2024 Alfa Romeo Stelvio Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118777 (Part #TK118777) fits the following vehicles: 2018-2024 Alfa Romeo Stelvio. Always verify your specific year, make, and model before ordering.
Yes, the 2018-2024 Alfa Romeo Stelvio Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118777 (Part #TK118777) is designed to fit the 2018-2024 Alfa Romeo Stelvio.
The 2018-2024 Alfa Romeo Stelvio Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118777 (Part #TK118777) Drilling is required for installation. Basic hand tools are typically all you need.
The T-One® T-Connector (part number 118777-037) is a trailer wiring harness designed for the Alfa Romeo Stelvio. It integrates with the vehicle's taillight wiring to provide trailer lighting connections. The system includes a 4-flat connector for trailer use, a black converter box, a fused power connection to the battery, and ground wiring.
Yes, the T-One® T-Connector (118777-037) is designed specifically for the Alfa Romeo Stelvio. The manual provides installation instructions tailored to this vehicle's taillight configuration and battery location in the rear cargo area.
Required tools are: trim panel remover, 10mm socket and ratchet or 10mm wrench, Torx 30 driver, drill with 3/32" bit, 1/4" socket, wire crimpers, wire cutters, Phillips head screwdriver, and test probe.
The kit includes: T-Connector ends with yellow and green wires, a black converter box, a 4-flat connector, double-sided tape for mounting the black box, a white ground wire with eyelet and screw, a black 12 gauge power wire, a yellow fuse holder with 15 amp fuse, a yellow butt connector, and cable ties for securing the harness.
Yes. You must disconnect the vehicle's negative (-) battery cable before connecting the power wiring. This is done in Step 10, after routing the black 12 gauge power wire to the battery. The negative cable is reconnected in Step 11 after the fuse holder is installed.
You must remove: the cargo door on the floor, the rear threshold plate (temporarily), interior trim panels on both driver and passenger sides, plastic wing screws behind the taillights, and the taillights on both sides. The manual cautions to carefully pull trim panels and taillights to avoid damaging alignment pins.
On the driver's side, plug the T-Connector end with the yellow wire between the mating plugs on the driver's side taillight socket and vehicle wiring harness (Step 4). On the passenger's side, route the T-Connector with the green wire below the threshold cover to the passenger's taillight housing, then plug it between the mating plugs on the passenger's side taillight socket and vehicle wiring harness (Steps 5-6). Ensure all connector surfaces are clean and free of dirt before connecting.
Pull away the grommets on both driver and passenger sides to access the interior. On the driver's side, route the T-Connector ends through the hole and into the tail lamp pocket, then reseat the grommet around the wires (Step 3). Route the T-Connector containing the green wire below the threshold cover to the passenger's side taillight housing, then route it through the hole and into the tail lamp pocket and reseat the grommet (Step 5). Leave the 4-flat connector and black converter box in the cargo area.
Yes. You must drill a 3/32" hole to secure the white ground wire. Locate a suitable grounding point near the connector such as the vehicle's frame or crossmember (do not drill into the vehicle floor or bed). Clean dirt and rustproofing from the area, drill the 3/32" hole, and secure the white wire using the eyelet and screw provided (Step 7).
Before drilling, verify what is behind any surface to avoid damage to the vehicle and personal injury. Do not drill into any exposed surfaces. Do not drill into the vehicle floor or bed. Clean dirt and rustproofing from the area before drilling the 3/32" hole.
Disconnect the vehicle's negative (-) battery cable. If not already removed, remove the fuse from the yellow fuse holder provided. After cutting 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 gauge wire using the yellow butt connector provided (Step 10). Route the black 12 gauge wire along the threshold and over to the vehicle's battery (Step 9).
The fuse rating is 15 amperes. Install the 15 amp fuse into the fuse holder after reconnecting the vehicle's negative (-) battery cable (Step 11).
The T-Connector uses: yellow wire (driver's side taillight connection), green wire (passenger's side taillight connection), white wire (ground connection to vehicle frame or crossmember), and black 12 gauge wire (power connection to vehicle battery positive terminal). The yellow fuse holder and yellow butt connector are also part of the power circuit.
On the driver's side, mount the T-Connector black box using the double-sided tape provided (Step 8). The black box should remain in the cargo area along with the 4-flat connector when not in use (Step 12 note).
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 (Step 12).
All connections must be complete for the T-One® T-Connector to function properly. Test and verify 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 (Step 11 warning).
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. Read and follow all warnings and instructions included with the product before beginning installation. Keep instructions for future reference.
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 list a specific amperage rating; refer to the product label and your vehicle's owner's manual for the exact rating.
Overloading circuits can cause fires. Do not exceed the stated product ratings or the towing manufacturer rating. Read your vehicle's owner's manual and the T-Connector instruction sheet for additional information on amperage limits.
Store the 4-flat connector in the rear cargo area when not in use (Step 12 note).
Yes, the T-One® T-Connector is designed specifically for the Alfa Romeo Stelvio.
You need: trim panel remover, 10mm socket/ratchet or wrench, Torx 30 driver, drill with 3/32" bit, 1/4" socket, wire crimpers, wire cutters, Phillips screwdriver, and test probe.
Yes, disconnect the vehicle's negative (-) battery cable before connecting the power wiring in Step 10, then reconnect it in Step 11 after installing the fuse.
The T-Connector uses a 15 ampere fuse installed in the yellow fuse holder provided.
Do not exceed the lower of your vehicle's towing manufacturer rating or the specific amperage rating stated on the product. Overloading can cause fires.
Verify that all connections are complete. The manual states: 'All connections must be complete for the T-One® T-Connector to function properly.' Check that the yellow wire is properly plugged into the driver's side taillight connector, the green wire is properly plugged into the passenger's side taillight connector, the white ground wire is securely fastened to the vehicle frame or crossmember, and the black power wire is properly connected to the battery positive terminal through the fuse holder. Test with a test light or trailer and reset the vehicle electrical system by temporarily removing the ignition key.
A blown fuse indicates an electrical overload or short circuit. Verify that you are not exceeding the product's amperage rating or your vehicle's towing manufacturer rating. Check all wire connections for damage, corrosion, or improper seating. Ensure the ground wire is securely fastened and making good contact with the vehicle frame. If the fuse continues to blow, there may be a short circuit in the wiring or a component failure; do not reinstall the fuse and consult the manufacturer.
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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
