Harley-Davidson FXB Sturgis Tail Light Bulb Size

The Harley-Davidson FXB Sturgis tail light uses a 1157 bulb size for this motorcycle model. The replacement chart covers 1980 to 1982 production years 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
1980-1982	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 1157 is the tail light bulb size specified for the Harley-Davidson FXB Sturgis across the 1980-1982 model years.
The 1157 is a dual-filament bulb, meaning it serves two lighting functions within a single unit, typically stop and tail light operation.
It operates on a 12-volt electrical system and carries a wattage rating of 21W for the primary filament and 5W for the secondary filament.
The 1157 uses a BAY15d bayonet base, which features two offset pins positioned at different heights to ensure the bulb is seated in the correct orientation, preventing incorrect filament alignment.
The 1157 designation follows the ANSI standard, applicable in both the United States and Canada.
The BAY15d base is not interchangeable with single-filament bayonet bases, as the dual-pin offset configuration is specific to dual-filament applications.