Introduction
The Dorman 645-657 Park and Turn Signal Lamp Socket is a direct replacement component designed to restore the proper function of your vehicle's park and turn signal lights. This socket ensures a reliable electrical connection for the bulb, matching the fit and function of the original equipment on specified vehicles. It serves as an ideal solution for replacing original sockets that may be missing, failed, or corroded due to environmental exposure.

Image 1: Angled view of the Dorman 645-657 Park and Turn Signal Lamp Socket, showing the main body and electrical connector.
Product Overview
This lamp socket is engineered for durability and reliable performance, providing a long service life. It is constructed from quality components to ensure consistent functionality.
Key Features:
- Direct replacement for original equipment, ensuring a precise fit.
- Constructed from quality components for long service life and reliable performance.
- Designed to withstand water and debris infiltration, preventing corrosion.
Package Contents:
- 1 Turn Signal Socket
Compatibility
This Dorman 645-657 lamp socket is compatible with a wide range of vehicles. To ensure precise fitment, always verify compatibility with your specific vehicle's make, model, and trim level using a vehicle fitment tool or by consulting your vehicle's service manual.
Compatible Vehicles:
- Chrysler: Breeze (1996), Cirrus (1995-1996), Concorde (1993-2004), Grand Voyager (1991-2000), LHS (1994-1997, 1999-2001), Neon (1995-1997), New Yorker (1993-1996), Sebring (1996-2000), Stratus (1995-1996), Town & Country (1991-2000), Voyager (1991-2000)
- Dodge: B150 (1994), B1500 (1995-1998), B250 (1994), B2500 (1995-1998), B350 (1994), B3500 (1995-1998), Dakota (1997-1998), Durango (1998), Intrepid (1993-2004), Neon (1995-1999), Stratus (1995-1996), Viper (1998-2002)
- Jeep: Cherokee (1999-2001), Wrangler (1997-2006)
- Plymouth: Breeze (1996), Grand Voyager (1991-2000), Neon (1995-1999), Voyager (1991-2000)
Setup and Installation
Installation of automotive electrical components should be performed by a qualified technician or individuals with appropriate automotive repair experience. Always prioritize safety and follow proper procedures.
General Installation Guidelines:
- Safety First: Disconnect the vehicle's battery (negative terminal first) before beginning any electrical work to prevent short circuits or electrical shock.
- Access the Lamp Assembly: Locate and access the park and turn signal lamp assembly on your vehicle. This may require removing trim panels, headlight assemblies, or other components. Refer to your vehicle's service manual for specific instructions.
- Remove Old Socket: Carefully disconnect the wiring harness from the old socket and remove the socket from the lamp housing. Note the orientation for correct reinstallation.
- Inspect Wiring: Examine the vehicle's wiring harness for any signs of corrosion, damage, or fraying. Repair any issues before installing the new socket.
- Install New Socket: Connect the vehicle's wiring harness to the new Dorman 645-657 socket. Ensure a secure and proper connection. Insert the new socket into the lamp housing, twisting or clicking it into place as required.
- Install Bulb: Insert the appropriate park/turn signal bulb into the new socket.
- Test Functionality: Reconnect the vehicle's battery (negative terminal last). Test the park lights and turn signals to ensure they function correctly before reassembling any removed components.
- Reassemble: Reinstall any removed trim panels or components in reverse order of removal.

Image 2: Top view of the socket, illustrating the bulb receptacle and internal contacts.
Operation
Once installed, the Dorman 645-657 lamp socket provides the electrical connection for the park and turn signal bulb. When the vehicle's park lights or turn signals are activated via the vehicle's control stalk or switch, the socket transmits power to the installed bulb, allowing it to illuminate as intended. The socket ensures a stable and secure connection for consistent light output.

Image 3: Angled view of the socket's electrical connector, highlighting the pins for wiring harness attachment.
Maintenance
The Dorman 645-657 lamp socket is designed for long-term reliability and typically requires no routine maintenance. However, periodic inspection during bulb replacement or other vehicle maintenance is recommended to ensure optimal performance and longevity.
Inspection Points:
- Check for signs of corrosion on the electrical contacts within the socket and on the bulb base.
- Ensure the socket is securely seated in the lamp housing and has not become loose.
- Verify the wiring harness connection remains tight and free from damage, such as cuts or fraying.
Troubleshooting
If you experience issues with your park or turn signal lights after installing the Dorman 645-657 socket, consider the following troubleshooting steps:
Issue: Bulb Not Illuminating
- Possible Cause: Faulty bulb.
Solution: Replace the bulb with a new, compatible one. - Possible Cause: Poor electrical connection at the socket.
Solution: Ensure the wiring harness is securely connected to the socket and the bulb is properly seated. - Possible Cause: Blown fuse.
Solution: Check the vehicle's fuse box for the relevant lighting fuse and replace if necessary. Consult your vehicle's owner's manual for fuse locations. - Possible Cause: Damaged wiring.
Solution: Inspect the vehicle's wiring leading to the socket for cuts, corrosion, or breaks and repair as needed.
Issue: Intermittent Light Function
- Possible Cause: Loose connection.
Solution: Re-seat the bulb firmly in the socket and check the wiring harness connection for tightness. - Possible Cause: Corrosion on contacts.
Solution: Disconnect power and carefully clean any corrosion from the socket and bulb contacts using a suitable electrical contact cleaner.
Specifications

Image 4: Bottom view of the socket, showing the sealed base.
| Specification | Detail |
|---|---|
| Manufacturer | Dorman Products |
| Brand | Dorman |
| Model | Dorman 645-657 |
| Item Weight | 1.44 ounces |
| Product Dimensions | 2.56 x 2.56 x 2.56 inches |
| Item Model Number | 645-657 |
| Manufacturer Part Number | 645-657 |
| OEM Part Numbers | S776; 4399900; 68060366AA |
Support and Warranty
Customer Support:
For technical assistance, installation guidance, or further inquiries regarding the Dorman 645-657 Park and Turn Signal Lamp Socket, please contact Dorman Products customer support. Refer to the official Dorman website (www.dormanproducts.com) for current contact information, including phone numbers and online support options.
Product Warranty:
Information regarding the warranty for the Dorman 645-657 Park and Turn Signal Lamp Socket can typically be found on the product packaging or the official Dorman Products website. Please retain your proof of purchase (receipt or invoice) for any potential warranty claims. Warranty terms and conditions may vary, so it is advisable to review the specific details provided by Dorman Products.