Honda Motorcycle CB750 Nighthawk Turn Signal Bulb Size
Honda Motorcycle CB750 Nighthawk front turn signal bulbs measure 1034 in size, while rear turn signal bulbs measure 1073 and P21W in size. The replacement chart covers 1991 to 2003 model 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 CB750 Nighthawk uses the 1034 bulb across all front turn signal positions for every model year from 1991-2003, making it the only front turn signal bulb type in these specifications.
The 1034 is an ANSI-standard dual-filament bulb rated at 12V and 21/5W, fitted with a BAY15d bayonet base. Its dual-filament design means it is capable of serving both a primary and a secondary lighting function within a single housing.
As a variant of the 1157, the 1034 shares the same BAY15d base configuration but operates at a lower wattage output, which affects brightness and thermal load on the socket.
The rear turn signal position on the CB750 Nighthawk is split between two bulb types across the 1991-2003 model range: the 1073 and the P21W.
The 1073 is an ANSI-standard single-filament bulb rated at 12V and 13W, using a BA15s bayonet base. It is a lower-wattage variant of the 1156 and is specified for the rear turn signal on the 1991-2003 CB750 Nighthawk in model years 1997, 2000, 2001, and 2003.
The P21W is an ECE-standard single-filament bulb rated at 12V and 21W, also using a BA15s bayonet base. It is specified for the rear turn signal in model years 1991-1996, 1998-1999, and 2002.
Although the 1073 and P21W share the same BA15s bayonet base, their wattage ratings differ significantly at 13W and 21W respectively. Substituting one for the other may affect turn signal flash rate and socket compatibility.
The front and rear turn signal positions on the CB750 Nighthawk use physically incompatible bases. The front uses a BAY15d base (1034), while the rear uses a BA15s base (1073 or P21W), and these two base types are not interchangeable.