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2021 - 2025 Honda Civic
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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: | 118859 |
| 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: | 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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The 2021-2023 Honda Civic Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118859 (Part #TK118859) fits the following vehicles: 2021-2025 Honda Civic. Always verify your specific year, make, and model before ordering.
The 2021-2023 Honda Civic Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118859 (Part #TK118859) fits 2021-2025 Honda Civic models. The 2025 model year is the last year covered by this part number. For newer models, check for an updated version.
Yes, the 2021-2023 Honda Civic Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118859 (Part #TK118859) is designed to fit the 2021-2025 Honda Civic.
The 2021-2023 Honda Civic Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118859 (Part #TK118859) Drilling is required for installation. Basic hand tools are typically all you need.
Yes, the T-One Connector part number 118859-037 is designed for Honda Civic Sedan. The manual does not specify which model years are compatible, so contact the manufacturer or check the product packaging for year-range compatibility.
The kit includes the T-One Connector black box, yellow fuse holder with 15 amp fuse, black 12 gauge wire, yellow butt connectors, white eyelet and screw for grounding, and double-sided tape for mounting the black box. The manual does not list all individual components, so verify the contents match your kit upon receipt.
Required tools are: trim panel remover, 10 mm socket and ratchet or 10 mm wrench, drill with 3/32" drill bit, wire crimpers, wire cutters, Phillips head screwdriver, and test probe. You will also need safety glasses.
Yes. The manual states to disconnect the vehicle's negative (-) battery cable in step 9 before connecting the fuse holder and power wiring. The battery is reconnected in step 12 after all wiring is complete.
Open the hatch and locate the trim panels covering the tail lights. Using a 10 mm socket and ratchet (or 10 mm wrench), remove the mounting screws on both the driver's and passenger's side. Be careful not to break the trim panel mounting tabs. Remove the tail lights and set them aside.
Disconnect the vehicle wiring harness from both taillight sockets. Separate the connector carefully to avoid breaking the locking tabs. Ensure all connector surfaces are clean and free of dirt before proceeding.
Beginning on the driver's side and underneath the vehicle, route the harness containing the yellow wire up through the opening between the vehicle bumper and body to the driver's side taillight pocket. The manual recommends using a fish wire between the taillight pocket and rear fascia to pull the harness from underneath the vehicle out through the taillight pocket for ease of installation.
Insert the T-One 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 before inserting.
Mount the T-One Connector black box underneath the vehicle behind the rear bumper fascia on the passenger's side using the double-sided tape provided. The epoxy side of the module must be pointed towards the ground to prevent water buildup.
Drilling may be required for the grounding point. You must locate a suitable grounding point near the black box, such as an existing ground stud, or drill a 3/32" hole to secure the white wire using the eyelet and screw provided. Do not drill into the vehicle floor or bed. Before drilling, verify what is behind any surface to avoid damage to the vehicle or personal injury.
Locate a suitable grounding point near the black box, such as an existing ground stud. If no existing stud is available, drill a 3/32" hole and secure the white 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.
Route the harness containing the green wire underneath the vehicle up through the opening between the vehicle bumper and body to the passenger's side taillight pocket. Use a fish wire between the taillight pocket and rear fascia to pull the harness from underneath the vehicle out through the taillight pocket for ease of installation.
Insert the T-One Connector end with the green wire between the vehicle wiring connectors and lock into place. Ensure all connector surfaces are clean and free of dirt before inserting.
Disconnect the vehicle's negative (-) battery cable. Remove the fuse from the yellow fuse holder if not already removed. Cut the fuse holder wire and attach the ring terminal 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.
Install a 15 amp fuse into the fuse holder. This is done in step 12 after all wiring connections are complete and the negative battery cable is reconnected.
Beginning from the front of the vehicle, route the black 12 gauge wire rearward along the frame rail. Avoid any hot pipes, heat shields, the fuel tank, or any other points that may pinch or break the wire. Connect the other end to the black power wire located on the T-One Connector's black box using the yellow butt connector provided.
Reconnect the vehicle's negative (-) battery cable and install the 15 amp fuse into the fuse holder. Reinstall all plastic trim panels, threshold, storage covers, floor covering, and other items removed during installation, being careful not to pinch or cut the wires. Secure all loose wires and mount the trailer tow harness in an accessible location with a bracket or electrical box. Test and verify installation with a test light or trailer. For the initial test, reset the vehicle electrical system by temporarily removing the key from the ignition.
Wear safety glasses during installation. Do not exceed the towing manufacturer rating (including in your vehicle owner's manual) or the specific amperage ratings stated on the product. Overloading circuits can cause fires. Do not drill into exposed surfaces or the vehicle floor or bed. If routing wires through a grommet or along the exterior, avoid hot pipes, heat shields, fuel tank, or points that may pinch or break the wire. Read and follow all warnings printed on the vehicle battery. All connections must be complete for the T-One Connector to function properly.
Yes. Before inserting the T-One Connector ends into the vehicle wiring connectors, ensure all connector surfaces are clean and free of dirt. This is required for both the driver's side (yellow wire) and passenger's side (green wire) connections.
Mount the black box underneath the vehicle behind the rear bumper fascia on the passenger's side using the double-sided tape provided. The epoxy side of the module must be pointed towards the ground to prevent water buildup.
Yes, part 118859-037 is designed for Honda Civic Sedan. Verify the specific model year matches your vehicle.
You need a trim panel remover, 10 mm socket/ratchet or wrench, drill with 3/32" bit, wire crimpers, wire cutters, Phillips screwdriver, test probe, and safety glasses.
Yes, disconnect the negative battery cable before connecting the fuse holder and power wiring in step 9. Reconnect it after all wiring is complete in step 12.
The T-One Connector uses a 15 amp fuse installed in the yellow fuse holder provided.
The power wire is 12 gauge (12 ga.) black wire routed from the vehicle battery to the T-One Connector black box.
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.
Verify that all connections are complete. Ensure the 15 amp fuse is installed in the fuse holder. Check that the negative battery cable is reconnected. 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. If the connector still does not function, check that all connector surfaces are clean and free of dirt, and that all wires are properly seated in their connectors.
The black box may not be mounted correctly. The epoxy side of the module must be pointed towards the ground to prevent water buildup. Remount the black box ensuring the epoxy side faces downward.
Verify that the wires are not routed near hot pipes, heat shields, the fuel tank, or any other points that may pinch or break the wire. If wires are routed through a grommet or along the exterior of the vehicle, reposition them to avoid these hazards. Ensure the black 12 gauge power wire is routed along the frame rail from the front of the vehicle rearward, away from potential pinch points.
1 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2021 - 2025 | Honda Civic | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
Ann
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
