Ford L800 License Plate Bulb Size

The Ford L800 license plate bulb uses a 1157 size bulb for this commercial truck model. The replacement chart covers vehicle production spanning 1980 to 1985 with corresponding bulb specifications.

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
1980-1985	1157

Bulb Specifications

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

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Additional Notes

The Ford L800 uses the 1157 bulb for the license plate position across all listed model years, spanning 1980-1985.
The 1157 is an ANSI-standardized bulb type recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by all compliant manufacturers.
The 1157 is a dual-filament bulb, which means it contains two separate filaments within a single glass envelope, each operating at a different wattage rating of 21W and 5W respectively.
The BAY15d bayonet base on the 1157 features two offset pins at different heights, a design that prevents the bulb from being inserted in the wrong orientation and distinguishes it from single-filament bayonet types with evenly spaced pins.
The 1157 operates on a 12V electrical system, consistent with the standard automotive voltage found in vehicles of this type.
Because the 1157 is a dual-filament type, substituting it with a single-filament bayonet bulb such as the 1156 would result in an incompatible electrical configuration, even though both share a similar base style.