Ford Crestline front and rear turn signal bulbs both utilize a 1154 size bulb for proper operation. The replacement chart covers 1950 through 1954 production 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 Ford Crestline uses the 1154 bulb for both front and rear turn signals across all listed model years, 1950-1954.
The 1154 is an ANSI-standardized bulb type recognized in both the United States and Canada.
The 1154 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve more than one lighting function.
The 1154 uses a BAY15d bayonet base, a two-pin offset bayonet mount where the two pins are positioned at different heights to ensure correct orientation during installation.
The 1154 is noted as an older variant of the 1157, a bulb type that became far more prevalent in later automotive applications.
The 1154 is rated for both 6V and 12V electrical systems, reflecting the transitional period in automotive electrics during which the Ford Crestline was produced.
Because the 1154 and 1157 share a similar BAY15d base style, substitution between the two warrants caution, as differences in filament wattage and voltage ratings between the variants can affect circuit compatibility.