Ducati 748S high beam headlight uses an H1 bulb size while low beam headlight uses an H3 bulb size. The replacement chart covers 2000 to 2002 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 Ducati 748S uses the H1 bulb for the high beam headlight across the 2000-2002 model years. The H1 is a single-filament halogen bulb with a P14.5s base, commonly rated at 55 watts and designed for dedicated high beam applications.
The low beam headlight on the 748S is fitted with the H3 bulb across the same 2000-2002 span. The H3 is also a single-filament halogen type, distinguished by its PK22s base and a compact, elongated capsule form that differs structurally from the H1.
Although both the H1 and H3 are single-filament halogen bulbs operating at similar wattages, their bases are not interchangeable. The P14.5s base of the H1 and the PK22s base of the H3 are physically distinct, meaning each socket accepts only its corresponding bulb type.
The 748S maintains consistent bulb fitment across all three model years covered in the specifications, with no variation in bulb type for either the high beam or low beam positions between 2000 and 2002.
The H3 bulb used in the low beam position connects via a single wire and a ground through the bulb body itself, a wiring arrangement that differs from the two-pin connector style associated with some other halogen formats.