Honda Motorcycle GL1200A Gold Wing Aspencade Turn Signal Bulb Size
Honda Motorcycle GL1200A Gold Wing Aspencade front turn signal bulb size 1034 and rear turn signal bulb size 1073, P21W are specified in this replacement chart. The chart covers 1984 to 1987 production years with corresponding 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 GL1200A Gold Wing Aspencade uses two distinct bulb types across its front and rear turn signals, with the front and rear positions drawing from entirely different specifications.
The 1034 bulb is an ANSI-standard dual-filament bulb operating at 12V with a 21/5W output and a BAY15d bayonet base, classified as a variant of the 1157.
The GL1200A Gold Wing Aspencade uses the 1034 bulb in the front turn signal position across all four model years covered, spanning 1984-1987.
The BAY15d base of the 1034 features offset pins, which physically prevents it from being substituted with single-filament bulbs that use the BA15s base, such as the 1073 or P21W.
The rear turn signal position does not share a single bulb type across all model years. The 1984 and 1987 models use the 1073, while the 1985 and 1986 models use the P21W.
The 1073 and P21W are both single-filament bulbs sharing the BA15s bayonet base, meaning they are physically interchangeable at the socket level, though their wattage ratings differ significantly at 13W and 21W respectively.
The P21W is an ECE-standard bulb rated at 21W, whereas the 1073 is an ANSI-standard bulb rated at 13W. Installing a P21W in place of a 1073 introduces a higher current draw than the original specification for that model year.
The 1073 is described as a lower wattage variant of the 1156, which itself is a common ANSI single-filament automotive bulb. The 1073 and 1156 share the BA15s base but are not identical in wattage output.
The split between ANSI and ECE rear bulb specifications across the production run of the GL1200A Gold Wing Aspencade reflects differences in regional lighting standards that applied during that period.
Because the front turn signal uses a dual-filament 1034 bulb while the rear uses single-filament bulbs, the two positions serve different electrical functions and the bulbs are not interchangeable between front and rear regardless of model year.