Harley-Davidson FLHTCUTG Tri Glide Ultra Headlight Bulb Size
Harley-Davidson FLHTCUTG Tri Glide Ultra headlight bulbs utilize a 9003 bulb size for both high and low beam functions. The replacement chart covers 2009 through 2013 vehicle production specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Harley-Davidson FLHTCUTG Tri Glide Ultra uses the 9003 bulb for both high beam and low beam headlight positions across the 2009-2013 model years.
The 9003 is an ANSI-standardized bulb designation recognized in the United States and Canada, making it a regionally specific classification rather than a universal international standard.
As a dual-filament halogen bulb, the 9003 houses two separate filaments within a single housing, which allows it to serve both high and low beam functions from one unit.
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 flange. This base type determines physical fitment and is not interchangeable with bulbs that use different base configurations.
The 9003 and H4 bulbs share the same dual-filament halogen design and P43t base, and are functionally equivalent in many applications. However, the 9003 follows ANSI standards while the H4 follows ECE standards, and subtle differences in filament positioning between the two can affect beam pattern compliance depending on the vehicle's optical system.