Harley-Davidson FXDWG Dyna Wide Glide headlight bulbs utilize 9003 size bulbs for both high and low beam functions. The replacement chart covers vehicle production spanning 1993 to 2017.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Harley-Davidson FXDWG Dyna Wide Glide uses the 9003 bulb for both high beam and low beam headlight positions across the 1993-2017 model range, with the sole exception of the 2009 model year, for which no specification is listed.
The 9003 is a dual-filament halogen bulb, meaning a single unit contains two separate filaments: one rated at 60 watts for the high beam and one rated at 55 watts for the low beam.
The bulb operates on a 12-volt electrical system, which is standard for motorcycle applications in this class.
The 9003 carries the P43t base designation, referring to a bayonet-style base with a 43mm collar. This base type determines physical fitment into the headlight housing and is not interchangeable with other base configurations.
The 9003 is an ANSI-recognized standard applicable in the United States and Canada. It is functionally equivalent to the European H4 bulb, though the designations originate from different standardization bodies.
Because the same 9003 bulb serves both the high beam and low beam functions, the headlight assembly on the FXDWG Dyna Wide Glide uses a single-bulb design rather than separate bulbs for each beam mode.
Substituting a single-filament bulb in place of the 9003 would result in the loss of one beam function, as single-filament alternatives cannot replicate the dual-beam operation provided by the 9003's two-filament construction.
The H4 and 9003 designations are often treated as interchangeable in the aftermarket, but base tolerances and filament positioning can vary between manufacturers, which may affect beam alignment in the housing.