The Honda Motorcycle VT1300CT Interstate uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2010 through 2015 model 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 Honda Motorcycle VT1300CT Interstate uses the 9003 bulb for both high beam and low beam headlight positions across all model years from 2010-2015.
The 9003 is an ANSI-standard bulb recognized in the United States and Canada, operating on 12 volts with a dual-filament halogen construction rated at 60 watts on high beam and 55 watts on low beam.
Because the 9003 contains two filaments within a single housing, one bulb serves both beam functions, which is why the same part number appears in both the high beam and low beam positions in the specifications.
The 9003 uses a P43t base, a bayonet-style mount with a 43mm collar, which determines physical fitment into the headlight socket and is not interchangeable with single-filament base types such as H1 or H7.
The 9003 is functionally equivalent to the H4 bulb used in international markets, sharing the same dual-filament design and wattage ratings, though the designations reflect different regional standards and housings may vary slightly.