Tekonsha T-One® T-Connector Harness User Manual

1. Product Overview

The Tekonsha T-One® T-Connector Harness (Model 118712) is a custom wiring solution designed to provide a 4-way flat trailer connector on select Chrysler Pacifica vehicles. This harness simplifies the process of connecting trailer lights by utilizing existing vehicle wiring, eliminating the need for cutting, splicing, or taping of vehicle wires.

Key features include:

• 16 Gauge Bonded Wire: Ensures reliable electrical conductivity.
• 4-Way Flat Plug & Play: Standard connector for common trailer lighting.
• Stop/Turn Circuit Capacity Of 4.2 Amps: Adequate power for trailer brake and turn signals.
• Taillight Circuit Capacity Of 7.5 Amps: Sufficient power for trailer taillights.
• Solid, Weatherproof, One-Piece Construction: Designed for durability in various conditions.
• No Cutting, Splicing, Or Taping Of Vehicle Wires: Preserves vehicle's original wiring integrity.

Image: Tekonsha T-One T-Connector Harness in use, demonstrating a truck towing a trailer, highlighting the product's application in trailering electrical connections.

2. Setup and Installation

This T-Connector harness is designed for a straightforward installation process, connecting directly into your vehicle's existing wiring system. While specific steps may vary slightly by vehicle model year, the general procedure involves accessing the vehicle's taillight wiring and routing the harness.

Image: All components of the Tekonsha T-One T-Connector Harness, including the main module, wiring, connectors, fuse, and terminal, laid out for inspection prior to installation.

General Installation Steps:

1. Preparation: Ensure the vehicle's ignition is off and the battery is disconnected to prevent electrical shorts during installation. Gather necessary tools, which may include a trim panel removal tool, wrench, and wire fishing tool.
2. Access Vehicle Wiring: Locate and access the taillight wiring connectors, typically behind the taillight assemblies. This may require removing interior trim panels or exterior taillight housings.
3. Connect T-Connectors: Plug the T-Connector harness directly into the vehicle's taillight wiring. The harness is designed with vehicle-specific connectors that match the factory plugs. Ensure connections are secure.
4. Route Wiring: Carefully route the harness wiring to the desired location for the 4-way flat connector, typically near the trailer hitch. Secure the wiring using zip ties to prevent sagging or contact with moving parts and hot surfaces.
5. Mount Converter Module: If applicable, mount the converter module in a secure, dry location within the vehicle, away from excessive heat or moisture.
6. Ground Connection: Connect the white ground wire from the harness to a clean, unpainted metal surface on the vehicle chassis using the provided ring terminal and screw. A good ground connection is critical for proper operation.
7. Power Connection (if applicable): For some applications, a direct power wire to the vehicle battery may be required. Route this wire safely, avoiding pinch points, and connect it to the positive battery terminal via the included fuse holder.
8. Test Functionality: Reconnect the vehicle battery. Use a trailer light tester or connect a trailer to verify all lighting functions (turn signals, brake lights, taillights) are working correctly.
9. Reassemble: Reinstall any removed trim panels or taillight housings.

Note: Always refer to the detailed instructions included in your product packaging for vehicle-specific diagrams and safety warnings. Professional installation is recommended if you are unsure about any steps.

3. Operating Instructions

Once the Tekonsha T-One® T-Connector Harness is correctly installed, operating it is straightforward. The harness provides a standard 4-way flat connector, which is compatible with most light-duty trailers.

Connecting to a Trailer:

1. Locate Connector: The 4-way flat connector will be routed to the rear of your vehicle, typically near the trailer hitch.
2. Align and Connect: Align the 4-way flat connector from your vehicle with the corresponding connector on your trailer. Push them firmly together until they are fully seated.
3. Secure Connection: Ensure the connection is secure and free from debris or moisture.
4. Test Lights: Before driving, always perform a quick test of all trailer lights:
   • Turn on vehicle headlights (taillights).
   • Activate left turn signal.
   • Activate right turn signal.
   • Apply vehicle brakes.
   Verify that all corresponding trailer lights illuminate correctly.

The harness automatically translates your vehicle's lighting signals to the trailer, ensuring proper synchronization of brake, turn, and taillight functions.

4. Maintenance

Proper maintenance of your Tekonsha T-One® T-Connector Harness will ensure long-lasting performance and reliable trailer lighting.

• Regular Inspection: Periodically inspect the 4-way flat connector and all visible wiring for signs of wear, corrosion, or damage. Check for frayed wires, cracked insulation, or loose connections.
• Keep Connections Clean: Keep the 4-way flat connector clean and free of dirt, dust, and moisture. Use a dielectric grease on the electrical contacts to prevent corrosion, especially in humid or corrosive environments.
• Secure Wiring: Ensure all wiring is securely fastened and not dangling or susceptible to being pinched or abraded by vehicle components or road debris.
• Fuse Check: If your harness includes an in-line fuse, periodically check the fuse for continuity, especially if trailer lights are not functioning. Replace with a fuse of the same amperage rating if blown.
• Storage: When not in use, consider using a dust cap or cover for the 4-way flat connector to protect it from the elements.

5. Troubleshooting

If you experience issues with your trailer lighting after installing the Tekonsha T-One® T-Connector Harness, refer to the following troubleshooting steps:

If troubleshooting steps do not resolve the issue, it is recommended to consult a qualified automotive technician or contact Tekonsha customer support.

6. Product Specifications

7. Warranty and Support

Warranty Information:

Tekonsha products are manufactured to high-quality standards. For specific warranty details, including coverage period and terms, please refer to the warranty documentation included with your product packaging or visit the official Tekonsha website. Warranty claims are typically handled directly by the manufacturer.

Customer Support:

If you have questions regarding installation, operation, troubleshooting, or warranty, please contact Tekonsha customer support. You can find contact information and additional resources on the official Tekonsha website:

Visit the Official Tekonsha Store on Amazon

For the most up-to-date support information, always check the manufacturer's official website.