Honda Motorcycle GL1500 Gold Wing Turn Signal Bulb Size
Honda Motorcycle GL1500 Gold Wing front turn signal bulbs measure 1034 in size, while rear turn signal bulbs measure P21W in size. The replacement chart covers 1988 to 1990 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 GL1500 Gold Wing uses two distinct bulb types across its front and rear turn signal positions for the 1988-1990 model years: the 1034 at the front and the P21W at the rear.
The 1034 is an ANSI-standard bulb used in the United States and Canada. It operates on a dual-filament design, meaning it serves two lighting functions from a single housing, and draws 12V at 21/5W through a BAY15d bayonet base.
The 1034 is a variant of the widely used 1157 bulb. While the two share a BAY15d bayonet base, they are not universally interchangeable, as wattage and filament ratings can differ between variants.
The P21W is an ECE-standard bulb used in European and worldwide markets. Unlike the 1034, it carries a single filament dedicated solely to signalling, drawing 12V at 21W through a BA15s bayonet base.
The BA15s base of the P21W and the BAY15d base of the 1034 are physically distinct. The BAY15d base features offset pins to prevent incorrect installation, while the BA15s base uses a single-contact, straight-pin design. The two are not interchangeable.
The single-filament P21W draws its full 21W on one filament, whereas the dual-filament 1034 splits its load between a 21W and a 5W filament. This difference in electrical draw is relevant when replacing bulbs or assessing load compatibility with the motorcycle's turn signal flasher relay.