Harley-Davidson FXWG Wide Glide Brake Bulb Size

Harley-Davidson FXWG Wide Glide brake bulb uses a 1157 size bulb for replacement applications. The chart covers 1980 to 1984 replacement specifications and bulb size data across those production years.

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	US Type	EU Type	Shop
1980-1984	1157	P21/5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157	Check Price
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W	Check Price

Other Locations

Additional Notes

The 1157 is a dual-filament bulb operating on a 12-volt system, with filaments rated at 21 watts and 5 watts respectively. The higher-wattage filament serves the brake or turn signal function, while the lower-wattage filament handles the running light function.
The 1157 uses a BAY15d bayonet base, which features two offset pins positioned at different heights on the base. This offset pin design prevents incorrect insertion of a single-filament bulb into a dual-filament socket.
The 1157 is standardized under ANSI specifications and is recognized across the United States and Canada, placing it within a widely distributed bulb family.
The Harley-Davidson FXWG Wide Glide uses the 1157 bulb for the brake light position across the 1980-1984 model years.
Because the 1157 is a dual-filament type, substitution with a single-filament equivalent such as the 1156 would be electrically incompatible with a socket wired to operate two independent filaments.