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Tekonsha
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2015 - 2021 Volkswagen Golf
Confirmed to Fit
2012 - 2019 Volkswagen Passat
Confirmed to Fit
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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: | 118646 |
| 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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2 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2015 - 2021 | Volkswagen Golf | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
| 2012 - 2019 | Volkswagen Passat | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
The 2012-2019 Volkswagen Passat, 2015-2021 Volkswagen Golf Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118646 (Part #TK118646) fits 2015-2021 Volkswagen Golf models. The 2021 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2012-2019 Volkswagen Passat, 2015-2021 Volkswagen Golf Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118646 (Part #TK118646) fits the following vehicles: 2015-2021 Volkswagen Golf; 2012-2019 Volkswagen Passat. Always verify your specific year, make, and model before ordering.
Yes, the 2012-2019 Volkswagen Passat, 2015-2021 Volkswagen Golf Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118646 (Part #TK118646) is designed to fit the 2015-2021 Volkswagen Golf.
The 2012-2019 Volkswagen Passat, 2015-2021 Volkswagen Golf Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118646 (Part #TK118646) Drilling is required for installation. Basic hand tools are typically all you need.
Yes, the T-Connector 118646-037 is designed for Volkswagen Golf. The manual does not specify model year range or trim variations, so contact the manufacturer or your installer to confirm fitment for your specific vehicle year and configuration.
The T-Connector is a wiring harness that integrates with your vehicle's existing taillight connectors to provide trailer lighting control. It uses a black box module and connects to your vehicle's battery to manage stop, turn and tail light signals for a trailer. The 4-flat connector is stored in the rear cargo area when not in use.
Required tools are: trim panel remover, 10 mm socket and ratchet or 10 mm wrench, drill with 3/32" bit, 1/4" socket, wire crimpers, wire cutters, Phillips head screwdriver, and test probe. You will also need safety glasses.
The T-Connector kit includes: two T-Connector ends (one with yellow wire, one with green wire), a black box module, cable ties, a yellow fuse holder with fuse, a ring terminal, a screw for the ground wire eyelet, an eyelet, and yellow butt connectors for joining wires.
Yes. You must disconnect the vehicle's negative (−) battery cable before making the final electrical connections to the positive battery terminal. This is a safety requirement to prevent electrical shock or short circuits during installation.
You must remove the threshold, trunk floor panels and trays from the rear cargo area. You must also partially remove the rear interior trim panels on both the driver and passenger sides of the vehicle. Several trim panel fasteners will need to be removed. Set all removed items aside carefully to avoid damage.
On the driver's side, separate the vehicle's wiring connectors carefully without breaking the locking tabs. Insert the T-Connector end with the yellow wire between the vehicle wiring connectors and lock into place. Ensure all connector surfaces are clean and free of dirt. Repeat this process on the passenger's side using the T-Connector containing the green wire, routing it below the threshold cover to the passenger's side taillight housing.
Yes. You must drill a 3/32" hole on the driver's side near the connectors to create a grounding point for the white wire. The white wire is secured to this hole using an eyelet and the screw provided. Before drilling, verify what is behind the surface to avoid damage to the vehicle or personal injury. Do not drill into any exposed surfaces.
Use a 3/32" drill bit to create the hole for the ground wire on the driver's side near the connectors.
The T-Connector uses four wire colours: yellow wire (driver's side taillight connector), green wire (passenger's side taillight connector), white wire (ground connection), and black wires (12 gauge power connection to battery). The yellow and green wires connect to the vehicle's existing taillight connectors. The white wire grounds to the vehicle frame. The black wires carry 12-volt power from the battery through the fuse holder.
From inside the vehicle, connect the black 12-gauge wire from the T-Connector black box module to the black 12-gauge wire using the supplied yellow butt connector. You may then route the black wire either through a grommet and along the exterior frame, or follow the 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 or other points that may pinch or break the wire.
The yellow fuse holder is a protective device supplied with the T-Connector. After disconnecting the vehicle's negative battery cable, remove the fuse from the yellow fuse holder if not already removed. Cut the fuse holder wire, attach the ring terminal to the vehicle's positive (+) battery cable, and secure it. Connect the other end of the fuse holder to the black 12-gauge wire using the supplied yellow butt connector. This protects the circuit from overload.
Locate a flat surface in an out-of-the-way place and mount the T-Connector's black box module to prevent damage or rattling. The manual does not specify an exact location, so choose a secure spot away from moving parts, heat sources and areas where it could be damaged.
Secure the remainder of the T-Connector harness with the cable ties provided to prevent damage, rattling and noise. Be careful to avoid any areas that would pinch, cut or melt the wire. After securing the harness, reinstall all 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.
Do not exceed the lower of your towing manufacturer's rating or these limits: maximum stop/turn light 2 per side (4.2 amps), maximum tail lights (7.5 amps). Overloading the circuit can cause fires. Consult your vehicle's owner's manual and instruction sheet for additional information on your specific towing capacity.
After installation is complete, test and verify the installation with a test light or by connecting an actual trailer. For the initial test, reset the vehicle's electrical system by temporarily removing the key from the ignition. All connections must be complete for the T-Connector to function properly. Use a test probe to verify proper operation of all lights.
Store the 4-flat connector in the rear cargo area when not in use.
Wear safety glasses during installation. Read and follow all warnings and cautions printed on the vehicle's battery and in the vehicle's owner's manual. 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 wires, avoid hot pipes, heat shields, fuel tank and other points that may pinch, cut or melt the wire. Use all safety precautions during installation.
The T-Connector 118646-037 is designed for Volkswagen Golf. Confirm your specific model year and configuration with the manufacturer or installer before purchasing.
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, test probe, and safety glasses.
Yes, you must disconnect the vehicle's negative (−) battery cable before making final electrical connections to the positive battery terminal.
The power connection uses black 12-gauge (12 ga.) wire routed through a yellow fuse holder to the vehicle's positive (+) battery terminal.
First, verify that all connections are complete and properly seated. Check that the T-Connector ends are fully locked into the vehicle's wiring connectors on both driver and passenger sides. Ensure the white ground wire is securely fastened with the eyelet and screw. Verify that the black power wire is properly connected to the battery through the yellow fuse holder and that the fuse is installed. Test the installation with a test light or trailer. Reset the vehicle's electrical system by temporarily removing the ignition key. If the system still does not function, check that all connector surfaces are clean and free of dirt, and that no wires have been pinched or damaged during installation.
Dim or flickering lights indicate a poor electrical connection. Check that all connector surfaces are clean and free of dirt. Verify that the T-Connector ends are fully seated and locked into the vehicle's wiring connectors. Ensure the white ground wire is securely fastened to the vehicle frame with the eyelet and screw. Check that the black power wire is properly connected to the battery and that the fuse in the yellow fuse holder is not blown. If connections are secure and the fuse is good, the vehicle's battery may need charging or there may be a corroded connection at the battery terminals.
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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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