Honda Motorcycle GL1500CF Valkyrie Interstate Turn Signal Bulb Size
Honda Motorcycle GL1500CF Valkyrie Interstate front turn signal bulbs use a P21/5W size while rear turn signal bulbs use a P21W size. The replacement chart covers 1999 to 2001 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 Honda Motorcycle GL1500CF Valkyrie Interstate uses two distinct bulb types across its turn signal positions: P21/5W at the front and P21W at the rear, both governed by ECE standards recognized in Europe and worldwide.
Both bulb types operate on a 12V electrical system, which is standard for motorcycles in this class.
The P21/5W is a dual-filament bulb rated at 21W and 5W, with the lower-wattage filament typically serving a secondary function such as a position or running light alongside the primary turn signal filament.
The P21W is a single-filament bulb rated at 21W, dedicated solely to turn signal operation at the rear of the GL1500CF Valkyrie Interstate.
The front turn signal position uses a BAY15d bayonet base, which is an offset twin-pin fitting. This base type is not interchangeable with the rear bulb's base.
The rear turn signal position uses a BA15s bayonet base, which is a single-pin fitting. Substituting a P21/5W with a BAY15d base into a BA15s socket is not physically compatible.
Despite both bulb types sharing the same 21W primary wattage rating, the differing base configurations and filament counts make front and rear turn signal bulbs non-interchangeable on this motorcycle.
The P21/5W and P21W specifications remained consistent across the 1999-2001 model years for both the front and rear turn signal positions on the GL1500CF Valkyrie Interstate.