Honda Motorcycle GL1100 Gold Wing Turn Signal Bulb Size
Honda Motorcycle GL1100 Gold Wing front turn signal bulb size measures 1034, while rear turn signal bulb size measures P21W. The replacement chart covers 1980 to 1983 model 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 GL1100 Gold Wing uses two distinct bulb types across its front and rear turn signal positions for the 1980-1983 model years.
The front turn signal on the GL1100 Gold Wing (1980-1983) takes the 1034 bulb, an ANSI-standard type used in the United States and Canada.
The 1034 is a dual-filament bulb operating at 12V with a 21/5W output, meaning one filament handles the higher-wattage turn signal function while the second filament serves a lower-wattage secondary role.
The 1034 uses a BAY15d bayonet base, which is an offset twin-pin mount. This base design physically prevents incorrect single-filament bulbs from being seated in its place.
The 1034 is a variant of the widely available 1157 bulb, sharing the same base type and dual-filament configuration, though the two are not necessarily interchangeable due to potential differences in wattage ratings.
The rear turn signal on the GL1100 Gold Wing uses the P21W bulb, an ECE-standard type recognized across European and international markets.
The P21W is a single-filament bulb rated at 12V and 21W, dedicated solely to signalling functions with no secondary filament.
The P21W uses a BA15s bayonet base, which is a single-pin mount. This base is not compatible with the BAY15d offset twin-pin base of the front 1034 bulb, making the two non-interchangeable despite both being bayonet-style fittings.
The front and rear turn signals on the GL1100 Gold Wing follow different international standards, with the front position conforming to ANSI specifications and the rear position conforming to ECE specifications.
Both the 1034 and P21W share a 12V operating voltage and a 21W primary filament wattage, but their base types, filament counts, and regulatory standards differ in ways that make substitution between the two positions inadvisable.