Honda Motorcycle VT500FT Ascot headlight bulbs use 9003 size for both high beam and low beam functions. The replacement chart covers 1983 to 1984 production years 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 9003 is the sole bulb type listed across all headlight positions for the Honda Motorcycle VT500FT Ascot, covering both the 1983-1984 model years.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains separate filaments for both high and low beam operation. This is why the same part number is specified for both beam positions.
The 9003 operates on a 12-volt electrical system and draws 60 watts on the high beam filament and 55 watts on the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type is standardized and determines physical fitment into the headlight housing.
The 9003 designation follows the ANSI standard, which is the applicable classification system for the United States and Canada. This standard governs the bulb's electrical and optical output requirements.
Because the high beam and low beam headlight positions share the same 9003 specification across both model years, the two positions are served by a single interchangeable bulb rather than separate dedicated units.