The Suzuki Motorcycle DR-Z400S uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production spanning 2000 to 2019 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 Suzuki Motorcycle DR-Z400S uses the 9003 bulb size for both high beam and low beam headlight positions across the 2000-2019 model years, with the exception of 2010.
The 9003 is an ANSI-standardized bulb designation used in the United States and Canada, making it the North American equivalent of the internationally designated H4 bulb.
As a dual-filament halogen bulb, the 9003 houses two separate tungsten filaments within a single glass envelope, with one filament dedicated to the high beam function and the other to the low beam function.
The 9003 operates on a 12-volt electrical system and carries a wattage rating of 60W for the high beam filament and 55W for the low beam filament.
The 9003 uses a P43t base, which is a three-pronged bayonet-style mount. This base type positions the filaments at a fixed orientation relative to the reflector housing, which is critical for proper light projection.
Because both the high beam and low beam positions on the DR-Z400S share the same 9003 bulb specification, a single bulb type serves both lighting functions through its dual-filament construction rather than through two separate bulbs.
The H4 and 9003 designations refer to the same physical bulb, though the two standards originate from different regional classification systems. Fitment compatibility between them is generally recognized in the industry.