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2021 - 2025 Acura TLX
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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: | 118857 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 1.1 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 | Acura TLX | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
The 2021-2024 Acura TLX Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118857 (Part #TK118857) fits 2021-2025 Acura TLX models. The 2025 model year is the last year covered by this part number. For newer models, check for an updated version.
Yes, the 2021-2024 Acura TLX Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118857 (Part #TK118857) is designed to fit the 2021-2025 Acura TLX.
The 2021-2024 Acura TLX Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118857 (Part #TK118857) fits the following vehicles: 2021-2025 Acura TLX. Always verify your specific year, make, and model before ordering.
The 2021-2024 Acura TLX Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118857 (Part #TK118857) Drilling is required for installation. Basic hand tools are typically all you need.
The T-One® Connector (part number 118857-037) is a vehicle wiring connector that integrates with your vehicle's taillight wiring harness to enable trailer lighting. It includes a black box control module, color-coded wiring (yellow, green, and white), a 15 amp fuse holder, and connectors that tap into the existing taillight circuits on both the driver's and passenger's sides.
The manual shows the T-One® Connector (118857-037) installed on an Acura TLX in the diagram. However, the manual does not provide a complete list of compatible vehicles or model years. Contact the manufacturer or your retailer to confirm fitment for your specific vehicle year and configuration.
You will need: trim panel remover, 8 mm socket and ratchet or 8 mm wrench, drill with 3/32" drill bit, wire crimpers, wire cutters, and a test probe. These tools are required to remove taillight assemblies, access wiring, drill the ground hole, and test the installation.
The kit includes: the T-One® black box control module, color-coded wiring harness (yellow, green, and white wires), double-sided tape for mounting the black box, cable ties for securing the harness, a 15 amp fuse holder with yellow fuse, yellow butt connectors, an eyelet and screw for the ground wire, and a 4-flat connector for storage when not in use.
Yes. You must disconnect the vehicle's negative (-) battery cable before making the power connections in step 11. The manual states: "Disconnect the vehicle's Negative (-) battery cable." After all wiring is complete and the fuse is installed, you reconnect the negative battery cable in step 13.
Open the rear cargo hatch and partially remove the plastic threshold cover, cargo trays, and felt liner to expose the vehicle's taillight wiring harness. Then remove both the driver's and passenger's taillight assemblies using an 8 mm socket or wrench, being careful not to break the mounting tabs.
The grommet is a rubber seal around the taillight wiring. You need to make a small cut or slit in it to allow the T-One® Connector wiring to pass through. After slitting, you insert the connector end with the yellow wire (driver's side) or green wire (passenger's side) through the slit into the grommet. The manual notes that you can optionally apply silicone sealant after installation to prevent environmental intrusion.
The black box is mounted on the driver's side using the double-sided tape provided in the kit. It should be mounted near a suitable grounding point, as the white ground wire must be secured to an existing ground stud or to a 3/32" hole drilled nearby.
Route the T-One® Connector end with the green wire to the passenger's side behind the panels and along the threshold to the taillight pocket. Use the cable ties provided to secure the harness and prevent damage or rattling, being careful to avoid areas that could cut or pinch the wire.
Yes, drilling is required for the ground wire. You must drill a 3/32" hole to secure the white ground wire using the eyelet and screw provided. However, you may avoid drilling if you can locate an existing ground stud near the black box to attach the ground wire instead. Do not drill into the vehicle floor or bed, and always verify what is behind any surface before drilling to avoid damage to the vehicle or personal injury.
The yellow fuse holder contains a 15 amp fuse and is part of the power circuit protection. The fuse holder wire is cut and attached to the vehicle's positive (+) battery cable with a ring terminal. The other end of the fuse holder connects to the black 12 gauge power wire using a yellow butt connector. This fuse protects the circuit from overload. After installation, the 15 amp fuse is installed into the fuse holder.
The T-One® Connector uses three main colored wires: yellow wire (driver's side taillight connection), green wire (passenger's side taillight connection), white wire (ground connection), and black wire (power connection to the vehicle's positive battery). Each color is routed to a specific location and function in the installation.
After connecting the fuse holder to the vehicle's positive battery cable, connect the other end of the black 12 gauge wire to the black power wire located on the T-One® Connector's black box using a yellow butt connector (provided). This completes the power circuit to the control module.
The T-One® Connector uses a 15 amp fuse. This fuse must be installed in the yellow fuse holder after all wiring connections are complete and the vehicle's negative battery cable has been reconnected.
After installation is 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. All connections must be complete for the T-One® Connector to function properly.
The manual does not specify a maximum amperage rating for the T-One® Connector itself. However, it states: "DO NOT exceed lower of towing manufacturing rating (including in your vehicle owner's manual) or specific amperage ratings stated on product." Check the product label and your vehicle's owner's manual for the specific amperage limit.
After reinstalling the plastic trim panels, threshold, storage covers, and floor covering, verify that no wires have been pinched or cut during reassembly. Test the T-One® Connector with a test light or trailer to confirm all connections are working properly. Store the 4-flat connector in the rear cargo area when not in use.
No. The manual states: "DO NOT exceed lower of towing manufacturing rating (including in your vehicle owner's manual) or specific amperage ratings stated on product." You must respect the lower of the two limits. Overloading circuits can cause fires. Always read your vehicle's owner's manual and the T-One® instruction sheet for additional information.
The manual notes this as optional: "after slitting the grommet apply a small amount of silicone sealant to the grommet and wire after installation to prevent environmental intrusion." Applying sealant is recommended to protect the wiring from moisture and environmental damage, but it is not required.
The manual shows installation on an Acura TLX but does not list all compatible vehicles. Contact the manufacturer or retailer to confirm fitment for your specific vehicle year and model.
Yes, disconnect the vehicle's negative (-) battery cable before making power connections in step 11. Reconnect it after the fuse is installed.
Yes, you must drill a 3/32" hole for the ground wire unless an existing ground stud is available. Do not drill into the vehicle floor or bed.
The T-One® Connector uses a 15 amp fuse in the yellow fuse holder provided.
Test with a test light or trailer after installation is complete. For the initial test, reset the vehicle's electrical system by temporarily removing the ignition key.
The manual states: "All connections must be complete for the T-One® Connector to function properly." Verify that: 1) the yellow wire connector is fully inserted and locked on the driver's side, 2) the green wire connector is fully inserted and locked on the passenger's side, 3) the black power wire is connected to the vehicle's positive battery through the fuse holder, 4) the white ground wire is securely attached to a ground point, 5) the 15 amp fuse is installed in the fuse holder, and 6) the vehicle's negative battery cable is reconnected. Test with a test light or trailer and reset the vehicle's electrical system by temporarily removing the ignition key.
Matt
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
