Ford F-7000 License Plate Bulb Size

The Ford F-7000 license plate light uses a 1157 bulb size for the rear illumination system on the vehicle. Available information covers the time range from 1970 through 1987 for the specified automotive component.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1979-1987	1157
1974-1978	1157 (Medium Duty)
1970-1973	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The Ford F-7000 uses the 1157 bulb for the license plate position across all listed model years, spanning 1970-1987.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope, rated at 21W and 5W respectively on a 12-volt circuit.
The 1157 uses a BAY15d bayonet base, a two-pin offset base design that prevents incorrect insertion by positioning the two pins at different heights along the base.
The 1157 designation follows ANSI standards recognized in both the United States and Canada, indicating a standardized specification for electrical and physical characteristics.
For the Ford F-7000 model years 1974-1978, the 1157 fitment carries a Medium Duty classification, distinguishing those entries from the remaining years in the specification set.
The 1979 and 1973 model years each appear without the Medium Duty designation, placing them alongside the 1970-1972 and 1980-1987 entries as unclassified variants within the same 1157 fitment.
Because the 1157 is a dual-filament type, substituting it with a single-filament equivalent such as the 1156 would not constitute a direct replacement, as the base pin configuration and wattage output differ between the two types.