Standard Ignition S-655 Engine Coolant Temperature Sending Unit Switch Connector

Engine Coolant Temperature Connector

Standard Ignition S-655 is an engine coolant temperature sending unit switch connector built for repair work on damaged, heat-aged, or corroded sensor wiring. It uses a female connector with a male wire-lead terminal and a 5 1/2-inch harness length for a direct electrical repair at the coolant temperature circuit.

Compatible With select Chevrolet Corsica, Ford F-250, Ford F-350, Ford E-250 Econoline Club Wagon, Ford E-350 Econoline, Ford E-350 Econoline Club Wagon, Buick Century, Oldsmobile Cutlass Cruiser, and other listed applications, this connector is a practical choice when the original plug no longer makes a secure connection. Standard Ignition S-655 is also cross-referenced to AP Exhaust 70003 and Dorman Conduct-Tite 85389 for the same application.

Key Features

• Engine coolant temperature sending unit switch connector for electrical repair
• Female connector with male terminal design
• Wire-lead terminal type for harness repair work
• Single-wire configuration with 5 1/2-inch harness length
• Built with high-grade materials for consistent conductivity and connection quality
• Standard Ignition S-655 for service on older GM and Ford applications

Detailed Description

Standard Ignition S-655 is intended for technicians replacing a failed coolant temperature sensor connector rather than the entire harness. The connector design supports a secure electrical interface at the engine coolant temperature sending unit switch, helping restore signal integrity when the original connector has cracked, loosened, or suffered terminal damage. It is listed for 1987-1996 Chevrolet Corsica, 1987-1994 Ford F-250 and F-350, 1987-1989 Ford E-Series van applications, 1988 Buick Century, 1988 Oldsmobile Cutlass Cruiser, 1994 Chevrolet G20, and 1994 Oldsmobile Achieva.

Standard Ignition’s pigtail and socket lineup is developed for electrical repair jobs where original equipment connectors fail from age, heat, or corrosion. The S-655 follows that approach with a service-focused connector built for dependable contact at the coolant temperature circuit.

Common Repair Uses

• Broken or brittle coolant temperature sensor connector housing
• Corroded terminals causing intermittent temperature signal loss
• Loose electrical connection at the engine coolant temperature sending unit switch
• Heat-damaged wiring near the sensor connector
• Check-engine or drivability concerns tied to a poor coolant temperature circuit connection

Installation Notes

Verify connector style, terminal gender, and harness routing before installation. Match the existing sensor plug to the female connector and confirm the wire-lead terminal connection is properly secured to the vehicle harness. Inspect the surrounding wiring for heat damage or corrosion so the repair addresses the full fault path. For fitment, use the listed vehicle applications such as Fits 1987-1994 Ford F-250, N/A; Fits 1987-1994 Ford F-350, N/A; and Fits 1988 Buick Century, N/A.

Quality Assurance

Standard Ignition uses high-grade materials and application-focused engineering to support reliable conductivity and a stable electrical connection. The brand’s pigtail and socket program is developed from long-term aftermarket and technician feedback to address common connector failure points in original equipment designs.