The Honda Motorcycle VTX1800C uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production years spanning 2002 to 2008.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Honda Motorcycle VTX1800C uses the 9003 bulb size for both its high beam and low beam headlight positions across the full 2002-2008 model range.
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 bulb operates on a 12V electrical system and uses a P43t base, which is a bayonet-style fitting with a 43mm collar used to lock the bulb into its housing.
The 9003 designation follows the ANSI standard, which is the classification system used in the United States and Canada, as opposed to the ECE system used in many other regions.
Because the same 9003 bulb serves both the high beam and low beam positions on the Honda Motorcycle VTX1800C, the headlight assembly relies on a single bulb rather than separate units for each function.
The 9003 bulb is electrically and physically interchangeable with the H4 bulb type, which follows the ECE designation for the same dual-filament P43t-base halogen specification, though labeling may differ by market.