Honda Motorcycle CB700SC Nighthawk S Turn Signal Bulb Size
Honda Motorcycle CB700SC Nighthawk S front turn signal bulb uses 1034 size while rear turn signal bulb uses P21W or 1073 size. The replacement chart covers 1984 to 1986 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 CB700SC Nighthawk S uses three distinct bulb types across its front and rear turn signals for the 1984-1986 model years: the 1034, the P21W, and the 1073.
The 1034 is the most consistently specified bulb in these listings, appearing as the front turn signal bulb across all three model years, 1984-1986.
The 1034 follows the ANSI standard used in the US and Canada and is a dual-filament bulb operating at 12V with a 21/5W output, mounted on a BAY15d bayonet base.
As a variant of the 1157, the 1034 shares the same BAY15d base configuration, though it is a distinct part number and the two are not confirmed as interchangeable in these specifications.
The rear turn signal position shows variation across model years, with the P21W specified for 1984 and 1986, while the 1073 is specified for 1985.
The P21W follows the ECE standard used in Europe and worldwide, making it a non-ANSI bulb in a motorcycle otherwise associated with ANSI-standard front lighting.
The P21W is a single-filament bulb operating at 12V and 21W, fitted with a BA15s bayonet base, which is a different base type from the dual-filament 1034 used at the front.
The 1073 is an ANSI-standard single-filament bulb operating at 12V and 13W on a BA15s base, described as a lower wattage variant of the 1156, and it shares the same BA15s base as the P21W despite being a different standard and wattage.
Because the 1073 and P21W share a BA15s base but differ in wattage (13W versus 21W) and regulatory standard, physical fitment does not confirm electrical interchangeability between the two rear turn signal bulbs.
The front and rear turn signal positions on the CB700SC Nighthawk S use incompatible base types, with the BAY15d base at the front and the BA15s base at the rear, meaning bulbs from one position cannot be fitted to the other.