Suzuki Motorcycle GS1100 headlight bulbs utilize a 9003 size for both high beam and low beam functions. 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 specified size for both the high beam and low beam headlight positions on the Suzuki Motorcycle GS1100 across the 1980-1983 model years.
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.
Because both headlight positions share the same 9003 bulb type, a single bulb serves both functions rather than requiring two separate bulbs of different types.
The 9003 operates on a 12V electrical system and uses a P43t base, which is a bayonet-style fitting with a 43mm flange used to seat and lock the bulb into the headlight housing.
The 9003 designation follows the ANSI standard as used in the United States and Canada. It is functionally equivalent to the H4 bulb used under European ECE standards, though the two designations reflect different regulatory frameworks and may carry minor specification differences.
The consistent use of the 9003 across all four model years and both beam positions means that a single replacement bulb type covers the full 1980-1983 GS1100 headlight fitment without variation.