Suzuki Motorcycle GS1000 headlight bulbs utilize a 9003 size for both high beam and low beam functions. The replacement chart covers vehicle production spanning 1978 to 1982.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Suzuki Motorcycle GS1000 uses the 9003 bulb for both high beam and low beam headlight positions across all listed model years, 1978-1982.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one rated at 60W for high beam output and one rated at 55W for low beam output.
The 9003 operates on a 12-volt electrical system, which is standard for motorcycles of this class.
The bulb uses a P43t base, a bayonet-style fitting with a 43mm collar that physically locks the bulb into the headlight housing.
The 9003 designation follows the ANSI standard, which applies to the United States and Canada markets.
Because the same 9003 bulb code applies to both the high beam and low beam positions, the GS1000 headlight assembly relies on a single dual-filament bulb rather than two separate single-filament units.