The Triumph Thunderbird ABS uses 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production years spanning 2010 to 2013.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Triumph Thunderbird ABS uses the 9003 bulb size for both high beam and low beam headlights across the 2010-2013 model years.
The 9003 is an ANSI-standard bulb recognized in the United States and Canada, operating at 12 volts with a dual-filament halogen design rated at 60 watts for high beam and 55 watts for low beam.
Because the 9003 contains two filaments within a single housing, one bulb serves both beam functions, which accounts for its use in both headlight positions on the Thunderbird ABS.
The 9003 bulb uses a P43t base, a bayonet-style mount with a 43mm collar, which determines physical fitment into the headlight socket.
The 9003 and H4 bulb types share the same dual-filament halogen construction and P43t base, making them functionally interchangeable in most applications, though the 9003 designation reflects the ANSI classification while H4 reflects the ECE standard used outside North America.
The uniform use of the 9003 across all four model years and both beam positions means a single bulb specification applies to the entire 2010-2013 Triumph Thunderbird ABS headlight system.