The Ford Gran Torino front side marker bulb uses a 194 size, while rear side marker positions accommodate either 194 or 1157 bulb sizes. The replacement chart covers 1972 through 1976 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 Gran Torino uses the 194 bulb as the dominant type across its front and rear side marker positions for the 1972-1976 model years.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, classified under the ANSI standard for the US and Canadian markets.
The T10 wedge base requires no locking mechanism, as the bulb is held in place by the tension of the socket itself.
The front side marker position on the Ford Gran Torino calls for the 194 bulb across all five model years covered in the specifications, from 1972 through 1976.
The rear side marker position on the 1975 Gran Torino is specified with the 1157 bulb, which differs from the 194 used in all other rear side marker positions listed.
The 1157 is a dual-filament bulb rated at 12V with a 21W high filament and a 5W low filament, fitted with a BAY15d bayonet base, also classified under the ANSI standard.
The BAY15d bayonet base of the 1157 is physically and electrically incompatible with the wedge socket designed for the 194, making the two bulb types non-interchangeable.
The dual-filament design of the 1157 serves two independent brightness levels within a single bulb, a function the single-filament 194 does not provide.
The rear side marker on the 1975 Gran Torino therefore requires a socket type distinct from the one used in the 1972-1974 and 1976 model years for the same position.