The Suzuki Motorcycle GS850 headlight uses a 9003 bulb size for both high beam and low beam applications. The replacement chart covers vehicle production spanning 1980 to 1983.
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 headlight bulb type specified for the Suzuki Motorcycle GS850 across all listed model years.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains both the high beam and low beam filaments within one housing.
The GS850 uses the same 9003 bulb size for both the high beam and low beam headlight positions across the 1980-1983 model years.
The 9003 operates on a 12-volt electrical system and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament.
The 9003 bulb uses a P43t base, which is a bayonet-style mount with a 43mm collar, and this base type determines physical fitment into the headlight socket.
The 9003 designation follows the ANSI standard applicable in the United States and Canada. It is functionally equivalent to the H4 bulb used under international IEC standards, though the designations originate from different standardization bodies.
Because the 9003 and H4 share the same physical base and filament configuration, aftermarket replacements labeled as either designation are generally interchangeable, provided the voltage and wattage ratings are compatible with the GS850 electrical system.