Harley-Davidson FLHRC Road King Classic Headlight Bulb Size
Harley-Davidson FLHRC Road King Classic headlight bulbs utilize a 9003 bulb size for both high and low beam functions. The replacement chart covers 1998 to 2013 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 Harley-Davidson FLHRC Road King Classic uses the 9003 bulb for both high beam and low beam headlight positions across all model years from 1998-2013.
The 9003 is an ANSI-standardized bulb type recognized in the United States and Canada, operating on a 12-volt electrical system with a dual-filament halogen design rated at 60 watts for high beam and 55 watts for low beam.
Because both the high beam and low beam positions share the same 9003 specification, a single bulb type serves both functions within one housing unit, which is characteristic of dual-filament halogen technology.
The 9003 bulb uses a P43t base, a bayonet-style mount with a 43mm collar, which physically determines fitment and is not interchangeable with bulbs carrying different base types even when wattage or voltage ratings are similar.
The 9003 and H4 bulb types share the same P43t base and dual-filament halogen construction, making them functionally equivalent in many applications, though the 9003 designation follows ANSI standards while H4 follows ECE standards used in Europe.