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2012 - 2018 Chevrolet Sonic
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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: | 118640 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 1.75 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: | 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 |
|---|---|---|
| 2012 - 2018 | Chevrolet Sonic | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
The 2012-2018 Chevrolet Sonic Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118640 (Part #TK118640) fits the following vehicles: 2012-2018 Chevrolet Sonic. Always verify your specific year, make, and model before ordering.
Yes, the 2012-2018 Chevrolet Sonic Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118640 (Part #TK118640) is designed to fit the 2012-2018 Chevrolet Sonic.
The 2012-2018 Chevrolet Sonic Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118640 (Part #TK118640) fits 2012-2018 Chevrolet Sonic models. The 2018 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2012-2018 Chevrolet Sonic Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118640 (Part #TK118640) Drilling is required for installation. Basic hand tools are typically all you need.
Yes, the T-Connector is designed for both Chevrolet Sonic Sedan and Sonic Hatchback models. Installation procedures differ slightly between body styles: Sedans require removal of the trunk threshold panel and partial removal of corner felt trunk liner, while Hatchbacks require removal of the plastic threshold cover, side panels, and cargo trays to access the rear wiring.
The T-Connector (118555-037) fits Chevrolet Sonic Sedan and Sonic Hatchback models. Installation steps vary by body style.
Required tools are: Trim Panel Remover, 10mm Socket & Ratchet or 10mm Wrench, Drill with 3/32" Drill Bit, 1/4" Socket, Wire Crimpers, Wire Cutters, Philips Head Screwdriver, and Test-probe.
Yes. You must drill a 3/32" hole on the driver's side near the connectors to secure the white ground wire with an eyelet and screw.
Yes. You must disconnect the vehicle's negative (-) battery cable before beginning installation. This is a safety requirement before working with the vehicle's electrical system.
Yes, disconnect the vehicle's negative battery cable before starting installation.
Drill a 3/32" hole on the driver's side near the connectors to secure the white ground wire. Before drilling, verify what is behind the surface to avoid damage to the vehicle or personal injury. Do not drill into any exposed surfaces.
Yes. You must drill one 3/32" hole on the driver's side near the connectors to mount the white ground wire with an eyelet and screw. Before drilling, verify what is behind the surface to avoid damage to the vehicle or personal injury, and do not drill into any exposed surfaces.
Beginning on the driver's side, separate the vehicle's wiring connectors behind the taillights, being careful not to break the locking tabs. Insert the T-Connector end with the yellow wire between the vehicle wiring connectors and lock into place. Ensure connectors are fully inserted with locking tabs in place. Repeat this process on the passenger side with the T-Connector end with the green wire, routing it behind the panels and along the threshold.
Mount the black box-module on a flat surface in an out-of-the-way place inside the vehicle interior only. The surface must be free of moisture and mounted high enough to prevent direct contact with water or liquid substances. The black box-module must NEVER be mounted on the exterior or in areas exposed to elements or moisture, as this could cause serious damage to the vehicle and module.
Mount the black box-module inside the vehicle interior only, on a flat, out-of-the-way surface that is free of moisture and high enough to avoid direct contact with water or liquids. Never mount it on the exterior or in moisture-exposed areas.
From inside the vehicle, connect the black 12 ga. wire and the black wire from the T-Connector black box using the supplied yellow butt connector. Route the black wire either through a grommet and 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. 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 ga. wire using the yellow butt connector.
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 on driver's side), and black wires (power connection to vehicle battery positive terminal via fuse holder). The grey 12-pin connector connects to the black box-module.
The yellow fuse holder protects the circuit from overload. Remove the fuse from the yellow fuse holder before installation. After cutting the fuse holder wire, attach the ring terminal to the vehicle's Positive (+) battery cable, and connect the other end of the fuse holder to the black 12 ga. wire using the yellow butt connector. The fuse must be reinstalled after all connections are complete.
Route the black wire either through a grommet and along the exterior frame, or follow existing wiring along the thresholds into the engine compartment up to the battery. Avoid hot pipes, heat shields, the fuel tank, and any other points that may pinch or break the wire. Be careful to avoid areas that would pinch, cut, or melt the wire.
Do not exceed the lower of the vehicle manufacturer's rating or: Maximum stop/turn light: 2 per side (4.2 amps); Maximum tail lights: (7.5 amps). Overloading the circuit can cause fires. Consult the vehicle's owner's manual and instruction sheet for additional information.
Do not exceed: 2 stop/turn lights per side (4.2 amps total) or 7.5 amps for tail lights. Overloading can cause fires.
All connections must be complete for the 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.
Test with a test light or trailer after installation. Reset the vehicle electrical system by temporarily removing the ignition key.
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. When replacing carpet and other clips or panels that were removed during installation, be careful not to cut or pinch the wires.
The T-Connector kit includes: T-Connector harness with yellow and green wire ends for taillight connections, white ground wire, black power wires, grey 12-pin connector, black box-module, yellow fuse holder with fuse, yellow butt connectors, ring terminal, eyelet, screw for ground connection, and cable ties for securing the harness. The 4-Flat connector should be stored in the trunk when not in use.
The grey 12-pin connector connects the T-Connector harness to the black box-module. Locate the grey 12-pin connector on the T-Connector and insert it into the mating connector on the black box-module. Ensure the mating surfaces match, are clean and free of dirt, and that connectors are fully inserted with locking tabs in place.
Open the trunk and remove the threshold panel. Partially remove the corner felt trunk liner on both sides to expose the vehicle's taillight wiring harness.
Open the hatch and partially remove the plastic threshold cover, side panels, and cargo trays to locate the vehicle wiring inside the rear cargo area.
The black power wire is 12 gauge (12 ga.).
Yes. If not already removed, remove the fuse from the yellow fuse holder before beginning the battery connection steps. After cutting the fuse holder wire and making all connections, the fuse should be reinstalled.
Locate a suitable grounding point on the driver's side near the connectors. Drill a 3/32" hole and secure the white wire with an eyelet using the screw provided. Do not drill into any exposed surfaces. Before drilling, verify what is behind the surface to avoid damage to the vehicle or personal injury.
Store the 4-Flat connector in the trunk area when not in use.
Verify that all connections are complete. Check that: (1) T-Connector ends with yellow and green wires are fully inserted into vehicle taillight connectors with locking tabs in place; (2) grey 12-pin connector is fully inserted into black box-module with locking tabs in place; (3) black 12 ga. wire and black box-module wire are connected with yellow butt connector; (4) white ground wire is securely fastened; (5) ring terminal is attached to vehicle positive battery cable; (6) fuse holder is connected to black 12 ga. wire; (7) fuse is installed in yellow fuse holder. Test with a test light or trailer. Reset the vehicle electrical system by temporarily removing the ignition key.
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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
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