ACDelco TC255 Professional Inline to Trailer Wiring Harness Connector

1. Introduction

The ACDelco TC255 Professional Inline to Trailer Wiring Harness Connector is a premium aftermarket component designed to facilitate the electrical connection between a towing vehicle and a trailer. This kit provides high-quality replacement components for vehicle systems such as ignition, starting and charging, body-electrical and lighting, and engine fuel management. Manufactured to meet expectations for fit, form, and function, this connector ensures reliable performance and dependability.

2. Setup and Installation

Proper installation of the ACDelco TC255 connector is crucial for safe and effective operation. Always refer to your vehicle's specific service manual for detailed wiring diagrams and safety procedures before beginning installation.

2.1 Safety Precautions

• Ensure the vehicle's ignition is off and the battery is disconnected before working with electrical components to prevent electrical shock or damage.
• Wear appropriate personal protective equipment, including safety glasses and gloves.
• Verify that the replacement connector is the correct size and fit for your specific vehicle application.

2.2 Installation Steps (General Guidelines)

1. Identify Connection Points: Locate the existing wiring harness connection points on your vehicle and trailer that require the new connector.
2. Remove Old Connector (if applicable): Carefully disconnect and remove the old or damaged connector, noting the wire color and position for each connection.
3. Prepare Wires: Strip the ends of the vehicle and trailer wires as needed, ensuring clean and secure contact points.
4. Connect New Harness: Connect the ACDelco TC255 connector to the vehicle's wiring harness and the trailer's wiring harness. Ensure all connections are secure and match the correct wire functions (e.g., ground, turn signals, brake lights).
5. Secure Connections: Use appropriate crimping tools or soldering techniques for permanent connections. Apply dielectric grease to protect contacts from corrosion and moisture.
6. Test Functionality: Reconnect the vehicle battery. With the trailer connected, test all lighting functions (running lights, brake lights, turn signals) and any other trailer electrical systems to ensure proper operation.

Figure 1: Close-up view of the vehicle-side connector pins, showing the internal contacts and housing.

Figure 2: Close-up view of the trailer-side connector, showing the three circular pin receptacles and the ground pin.

3. Operating Instructions

Once the ACDelco TC255 connector is correctly installed, its operation is straightforward:

• Connecting Trailer: Align the vehicle-side connector with the trailer-side connector and push them firmly together until they click or are securely seated.
• Pre-Towing Check: Before each towing operation, visually inspect the connection to ensure it is secure and free from debris. Verify that all trailer lights (running lights, brake lights, turn signals) are functioning correctly.
• Disconnecting Trailer: To disconnect, firmly grasp both ends of the connector and pull them apart. Avoid pulling directly on the wires.

4. Maintenance

Regular maintenance helps ensure the longevity and reliable performance of your wiring harness connector.

• Inspect Regularly: Periodically inspect the connector and associated wiring for any signs of wear, cracks, fraying, or damaged insulation. Replace the harness if significant damage is observed.
• Clean Connections: Keep the connector pins and receptacles clean and free from dirt, moisture, and corrosion. Use a non-abrasive electrical contact cleaner if necessary.
• Apply Dielectric Grease: Apply dielectric grease to the electrical contacts to protect them from water intrusion and corrosion. This is a standard practice to maintain connection integrity.
• Check for Secure Fit: Ensure the connector remains securely fitted. Loose connections can lead to intermittent electrical issues.

Figure 3: Another view of a multi-pin connector, highlighting the secure locking mechanism and wire entry points.

5. Troubleshooting

If you experience issues with your trailer's electrical system, consider the following troubleshooting steps:

• No Power to Trailer Lights:
  • Check the vehicle's fuses related to trailer wiring.
  • Ensure the connector is fully seated and secure.
  • Inspect the wiring for any visible damage or breaks.
  • Verify that the vehicle's battery is properly charged and connected.
• Intermittent Light Function:
  • Check for loose connections at the harness and trailer lights.
  • Inspect for corrosion on the connector pins; clean and apply dielectric grease if necessary.
  • Ensure proper grounding for both the vehicle and trailer electrical systems.
• ABS Light or Check Engine Light Illumination: While less common for a trailer harness, a malfunctioning wire harness in general can sometimes trigger vehicle warning lights. If these lights illuminate after working with wiring, re-check all connections and consult a professional mechanic.

If troubleshooting steps do not resolve the issue, it is recommended to consult a qualified automotive technician.

6. Specifications

7. Warranty and Support

ACDelco products are manufactured to high standards, providing the performance and dependability you expect. For specific warranty information or technical support regarding your TC255 Professional Inline to Trailer Wiring Harness Connector, please refer to the official ACDelco website or contact ACDelco customer service directly. Keep your purchase receipt for warranty claims.

For additional resources and product information, visit the official ACDelco website: www.acdelco.com