Honda Motorcycle CH150 Elite Turn Signal Bulb Size
Honda Motorcycle CH150 Elite front turn signal bulb uses 1034 size while rear turn signal bulb uses P21W size. Replacement chart covers 1985 to 1987 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 CH150 Elite uses two distinct bulb types across its turn signal positions: the 1034 for the front and the P21W for the rear, a split that held consistent across the 1985-1987 model years.
The 1034 is an ANSI-standard bulb used in the United States and Canada. It operates on a 12-volt circuit and carries a dual-filament design rated at 21/5 watts, meaning one filament handles the higher-intensity turn signal function while the other handles a lower-intensity secondary function.
The 1034 uses a BAY15d bayonet base. The BAY15d designation indicates an offset pin configuration, which physically prevents single-filament bulbs from being seated in its socket, as the two pins are positioned at different heights.
The 1034 is a variant of the 1157 bulb. While the two share the same BAY15d base and dual-filament design, they are not identical, and substitution between them may affect electrical compatibility or light output.
The P21W is an ECE-standard bulb used in European and worldwide markets. It operates on a 12-volt circuit and carries a single filament rated at 21 watts, dedicated solely to the turn signal function.
The P21W uses a BA15s bayonet base. The BA15s designation indicates a single-contact base with symmetrically placed pins, which is not interchangeable with the BAY15d base found on the 1034 front bulb.
Because the front and rear sockets on the CH150 Elite are built around different base types, BAY15d at the front and BA15s at the rear, the two bulb positions are not interchangeable with each other.
The regulatory standards behind each bulb reflect a market distinction. The ANSI-standard 1034 at the front aligns with North American electrical and lighting norms, while the ECE-standard P21W at the rear aligns with international regulations.