Honda Motorcycle GL1500I Gold Wing Interstate Turn Signal Bulb Size
Honda Motorcycle GL1500I Gold Wing Interstate front turn signal bulb size 1034 and rear turn signal bulb size P21W, 1073. The replacement chart covers 1992 to 1996 production years with bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle GL1500I Gold Wing Interstate uses the 1034 bulb across all listed model years (1992-1996) for the front turn signal position, making it the most consistent fitment in these specifications.
The 1034 is an ANSI-standard dual-filament bulb rated at 12V and 21/5W, fitted with a BAY15d bayonet base, and is classified as a variant of the more widely known 1157.
A BAY15d base features two pins offset at different heights, which physically prevents single-filament bulbs from being seated in a dual-filament socket, serving as a built-in interchangeability safeguard.
The rear turn signal position shows a split between two different bulb types across the 1992-1996 range, with the P21W specified for 1992-1993 and 1995-1996, while the 1073 is specified exclusively for 1994.
The P21W is an ECE-standard single-filament signalling bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and is common in European and worldwide automotive applications.
The 1073 is an ANSI-standard single-filament bulb also using a BA15s bayonet base but rated at a lower 12V and 13W output, and is described as a lower wattage variant of the 1156.
Although the P21W and 1073 share the same BA15s base type, their wattage ratings differ significantly (21W versus 13W), which means they are not electrically equivalent and substituting one for the other may affect turn signal flash rate or circuit load.
The 1034 and P21W are not interchangeable due to differing base types, BAY15d versus BA15s respectively, in addition to their different filament configurations.