Suzuki Motorcycle GSF400 Bandit headlight bulb uses 9003 size for both high and low beam functions. The replacement chart covers 1991 to 1993 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 9003 bulb is the sole bulb type specified across all headlight positions in the Suzuki Motorcycle GSF400 Bandit headlight system, covering both high beam and low beam functions for the 1991-1993 model years.
The 9003 is a dual-filament halogen bulb, meaning a single physical unit contains separate filaments for both high and low beam output, rated at 60W for high beam and 55W for low beam on a 12V electrical system.
The 9003 bulb uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type is specific to the 9003 and its international equivalent, the H4, and is not interchangeable with single-filament base types such as P14.5s or P15d.
The 9003 carries an ANSI designation, indicating it conforms to standards established for the United States and Canadian markets. This is a relevant fitment consideration for units sourced or sold outside those regions, where the functionally equivalent H4 designation is more commonly referenced.
Because the 9003 serves both the high beam and low beam positions, the same bulb part number applies to both headlight sub-assemblies. No separate bulb type is required for each function.