The Pontiac Torpedo front and rear turn signal bulbs both utilize a 1154 size bulb for proper operation. The replacement chart covers 1950 through 1953 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1154 is the specified bulb type for both the front and rear turn signals of the Pontiac Torpedo across the 1950-1953 model years.
The 1154 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical standards shared across those markets.
As a dual-filament bulb, the 1154 contains two separate filaments within a single envelope, allowing it to serve more than one lighting function from a single socket.
The 1154 uses a BAY15d bayonet base, a two-pin offset bayonet mount in which the two pins are positioned at different heights to ensure the bulb can only be inserted in one orientation, preventing incorrect filament alignment.
The 1154 is noted as an older variant of the 1157, a bulb type that became far more prevalent in later automotive applications and shares the same BAY15d base configuration.
The 1154 is rated for both 6V and 12V electrical systems, reflecting the transitional period in automotive engineering during which manufacturers moved from 6-volt to 12-volt vehicle electrical systems.
Because the 1154 and 1157 share the same BAY15d base, physical fitment between the two types is possible, but their differing wattage ratings mean substitution may affect circuit behavior and is not automatically interchangeable without verifying system compatibility.