Honda Motorcycle GL1500CT Valkyrie Tour Turn Signal Bulb Size
Honda Motorcycle GL1500CT Valkyrie Tour front turn signal bulb size measures P21/5W or 1034, while rear turn signal bulb size measures P21W. The replacement chart covers 1997 through 2000 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 GL1500CT Valkyrie Tour uses three distinct bulb types across its front and rear turn signal positions: P21/5W, 1034, and P21W.
The P21/5W and 1034 are both dual-filament bulbs rated at 12V with a 21W main filament and a 5W secondary filament, sharing the BAY15d bayonet base configuration.
Despite their shared base type and wattage ratings, the P21/5W follows the ECE standard used in Europe and worldwide markets, while the 1034 follows the ANSI standard used in the US and Canada.
The 1034 is a variant of the 1157, a widely used ANSI-coded dual-filament bulb, which places it within a well-established North American automotive bulb family.
The front turn signal on the GL1500CT Valkyrie Tour changed from the 1034 bulb in 1997-1999 to the P21/5W in 2000, representing a shift from the ANSI standard to the ECE standard for that position.
The rear turn signal uses the P21W across all listed model years from 1997-2000, indicating no change in that specification over the production run covered.
The P21W is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, which is a different base type from the BAY15d used in the front turn signal positions.
The BA15s and BAY15d bases are not interchangeable. The BAY15d features offset pins to ensure correct dual-filament orientation, while the BA15s has a single-contact, symmetrical pin arrangement suited to single-filament applications.
Because the front and rear turn signals use different base types, bulbs from one position cannot be substituted into the other, regardless of wattage similarity.
For the 2000 model year, both the front P21/5W and the rear P21W carry the ECE designation, though their differing filament counts and base types make them distinct, non-interchangeable components.