Standard Ignition TS-78 Engine Coolant Temperature Sender

Engine Coolant Temperature Sender for Classic GM Trucks

Standard Ignition TS-78 is an engine coolant temperature sender built for vehicles that use a dashboard coolant temperature indicator light. It uses a male connector, male blade terminal, and a single terminal layout for straightforward electrical connection in the correct application.

Designed for a wide range of Chevrolet and GMC trucks, vans, and passenger vehicles from the 1970s and 1980s, TS-78 supports accurate temperature signal transfer in systems that rely on a light rather than a gauge. This part cross-references 1T1087 and TS6624 for the same application.

Key Features

• Engine coolant temperature sender for indicator-light applications
• Male connector gender with male blade terminal
• Single-terminal design for simplified hookup
• Factory-calibrated and tested for specified actuation temperature
• Built with robust materials for service use
• Uses a formed bimetal contact arm and calibrated thermal action for precise switching

Detailed Description

Standard Ignition TS-78 is engineered for older Chevrolet C10, K10, C20, K20, C30, K30, P20, and P30 applications, along with matching GMC C1500, K1500, P1500, C2500, K2500, C3500, K3500, P2500, and P3500 models. It also covers select Chevrolet Suburban, Blazer, Camaro, Caprice, Impala, Nova, and GMC Jimmy applications that use a coolant temperature indicator light on the dashboard. The sender is manufactured with calibrated thermal components to deliver consistent electrical contact at the specified temperature point.

Standard Ignition TS-78 is a practical replacement for vehicles such as 1977-1985 Chevrolet C20, 1979-1985 Chevrolet C30, and 1980-1985 GMC C2500, as well as other listed GM fitments. If you are servicing a Chevrolet C10, GMC K1500, or a 1974 Chevrolet Blazer with a temperature warning light, this sender matches the listed OE-style application requirements.

Common Problems This Part Addresses

• Temperature warning light stays on or does not illuminate correctly
• Erratic coolant temperature signal to the dash indicator circuit
• Failed sender causing inaccurate overheat warning behavior
• Electrical contact wear in older thermal sender systems
• Replacement need during cooling system or engine service

Installation Notes and Tips

Verify the vehicle uses a coolant temperature indicator light application before ordering. Confirm connector style, terminal type, and engine/manifold configuration against the original part, especially on cast iron manifold and federal emissions listings. Clean the mounting threads and electrical contact area before installation, and compare the removed sender to TS-78 for thread and terminal match.

Quality Assurance

Standard Ignition manufactures this sender with complete quality control from component selection through final testing. Each unit is calibrated and tested to confirm switch actuation at the specified temperature, supporting consistent performance in classic GM cooling system warning circuits.