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Tekonsha
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2021 - 2025 Ford Mustang Mach-E
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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: | 118840 |
| 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 |
|---|---|---|
| 2021 - 2025 | Ford Mustang Mach-E | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
Yes, the 2021-2023 Ford Mustang Mach-E Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118840 (Part #TK118840) is designed to fit the 2021-2025 Ford Mustang Mach-E.
The 2021-2023 Ford Mustang Mach-E Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118840 (Part #TK118840) fits the following vehicles: 2021-2025 Ford Mustang Mach-E. Always verify your specific year, make, and model before ordering.
The 2021-2023 Ford Mustang Mach-E Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118840 (Part #TK118840) fits 2021-2025 Ford Mustang Mach-E models. The 2025 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2021-2023 Ford Mustang Mach-E Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118840 (Part #TK118840) Drilling is required for installation. Basic hand tools are typically all you need.
The T-Connector is a T-One® Connector that integrates with your vehicle's existing tail light wiring to provide a 4-Flat trailer connector. It intercepts the vehicle's tail light signals (using yellow and green wires on the driver and passenger sides respectively) and converts them to a standard 4-Flat connector for trailer use. The system includes a black converter box that processes the signals and requires a 15 amp fuse for power protection.
Yes, the manual specifically lists the Ford Mustang Mach E as a compatible application. However, the manual does not specify whether it fits all model years or trim levels of the Mach E. Contact the manufacturer or a fitment database to confirm compatibility with your specific vehicle year and configuration before purchasing.
You will need: trim panel remover, 8 mm socket and ratchet (or 8 mm wrench), drill with 3/32" drill bit, 1/4" socket, wire crimpers, wire cutters, Phillips head screwdriver, and a test probe. Safety glasses are also required during installation.
The kit includes: yellow and green T-One® Connector ends, a black converter box, double-sided tape for mounting the converter box, cable ties for securing harnesses, a white wire with eyelet and screw for grounding, a black 12 gauge power wire, a yellow fuse holder with 15 amp fuse, and a yellow butt connector for connecting the fuse holder to the black power wire.
Yes. You must disconnect the vehicle's negative (−) battery cable before making the final power connections. Specifically, disconnect it before attaching the ring terminal to the positive (+) battery cable in step 9. Reconnect the negative cable after installing the 15 amp fuse in step 10.
Yes. You must remove both the driver and passenger side tail lights to access the tail light connectors. Use a trim panel remover to remove the round covers (two per side) that cover the tail light bolts, then use an 8 mm socket to remove the two bolts on each side. Carefully pry the tail light away and set it aside. The tail lights are reinstalled at the end of the installation.
On the driver's side, insert the T-One® Connector end with the yellow wire between the vehicle's wiring connectors and lock it into place. Be careful not to damage the locking tabs and ensure the connectors are fully inserted with locking tabs engaged. Repeat the same process on the passenger's side with the T-One® Connector end with the green wire. The manual emphasizes being careful not to damage the locking tabs during insertion.
Mount the black converter box on the driver's side in a flat, out-of-the-way location using the double-sided tape provided. The epoxy side of the module must point toward the ground to prevent water buildup. The unit must be mounted in a protected area under the vehicle where it cannot be damaged by road debris or objects driven over.
Yes. You must drill one 3/32" hole to secure the white ground wire. Locate a suitable grounding point near the connector on the vehicle's frame or crossmember (do not drill into the vehicle floor or bed). Clean dirt and rustproofing from the area, then drill the hole and secure the white wire using the eyelet and screw provided. Always verify what is behind any surface before drilling to avoid damage to the vehicle or personal injury.
The T-Connector uses a 15 amp fuse. The fuse is installed in the yellow fuse holder provided with the kit. After disconnecting the negative battery cable, remove the fuse from the yellow fuse holder, cut 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 gauge wire using the yellow butt connector. Reconnect the negative battery cable and install the 15 amp fuse into the fuse holder.
Locate the black 12 gauge power wire from the T-Connector box on the driver's side. Attach the black 12 gauge wire provided. Route the black wire 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 of the vehicle, carefully avoid hot pipes, heat shields, the fuel tank, or any other points that may pinch or break the wire.
The T-Connector uses four main wire colours: yellow wire (driver's side tail light connector), green wire (passenger's side tail light connector), white wire (ground connection to vehicle frame), and black wire (12 gauge power wire from converter box to battery). The yellow fuse holder and yellow butt connector are also part of the power circuit.
Always wear safety glasses during installation. Before drilling, verify what is behind any surface to avoid damage to the vehicle or personal injury. Do not drill into the vehicle floor, bed, or exposed surfaces. When routing wires, avoid hot pipes, heat shields, the fuel tank, and any areas that could pinch or break the wire. Read and follow all warnings printed on the tow vehicle's battery. Do not exceed the product's stated amperage rating (15 amp fuse) or the towing manufacturer's rating, as overloading circuits can cause fires.
After all connections are complete, test and verify the installation with a test light or trailer. For the initial test, reset the vehicle's electrical system by temporarily removing the key from the ignition. The manual emphasizes that all connections must be complete for the T-One® T-Connector to function properly.
Route the 4-Flat harness underneath and to the center of the vehicle. Mount the 4-Flat end in an accessible location with a bracket or electrical box. Note that the bracket or electrical box is not included with the T-Connector kit and must be sourced separately.
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 cut, pinch, or melt the wire. This applies to both the initial harness routing under the vehicle and the final securing of all remaining harness sections after the power connections are made.
After testing the installation and verifying all connections work properly, reinstall the tail light housing assemblies. Position the vehicle wiring harness between the housing and the vehicle body. Replace any other items that were removed during installation, such as the round covers over the tail light bolts.
The manual confirms compatibility with the Ford Mustang Mach E. For other vehicles, contact the manufacturer or check a fitment database, as the manual does not list other applications.
Yes, disconnect the negative (−) battery cable before making power connections in step 9, and reconnect it after installing the 15 amp fuse in step 10.
Yes, you must drill one 3/32" hole for the white ground wire. Always verify what is behind the surface before drilling to avoid damage to the vehicle or injury.
Do not exceed the lower of the towing manufacturer's rating (including in your vehicle owner's manual) or the product's 15 amp fuse rating. Overloading circuits can cause fires.
Yes, remove both driver and passenger side tail lights using a trim panel remover and 8 mm socket to access the tail light connectors. Reinstall them at the end of the installation.
The manual states that all connections must be complete for the T-One® T-Connector to function properly. Verify that: (1) both T-One® Connector ends (yellow and green wires) are fully inserted between the vehicle's wiring connectors with locking tabs fully engaged on both driver and passenger sides; (2) the white ground wire is securely attached to the vehicle frame or crossmember; (3) the black 12 gauge power wire is properly connected from the converter box to the battery through the fuse holder; (4) the 15 amp fuse is installed in the yellow fuse holder; and (5) the negative battery cable is reconnected. After verifying all connections, reset the vehicle's electrical system by temporarily removing the key from the ignition, then test with a test light or trailer.
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May 22, 2023
