Harley-Davidson FLHTCU Electra Glide Ultra Classic headlight bulbs utilize a 9003 bulb size for both high and low beam functions. The replacement chart covers 1989 through 2013 production 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 FLHTCU Electra Glide Ultra Classic uses the 9003 bulb size for both the high beam and low beam headlight positions across the 1989-2013 model range covered by these specifications.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments, one rated at 60W for high beam output and one at 55W for low beam output.
Because both the high beam and low beam positions share the same 9003 specification, a single bulb type serves both lighting functions in the headlight assembly rather than requiring two distinct bulb types.
The 9003 bulb operates on a 12V electrical system, which is standard for motorcycle applications of this type.
The 9003 designation follows the ANSI standard used in the United States and Canada. It is electrically equivalent to the European H4 bulb, though the two designations reflect different regional certification systems and may involve physical differences that affect interchangeability.
The P43t base is the mounting interface of the 9003 bulb. The "P" denotes a prefocus base, and "43t" refers to the base width in millimeters with a three-pin configuration, which locks the bulb into a fixed rotational position to maintain correct filament alignment within the reflector housing.