The Moto Guzzi V9 headlight uses a 9003 bulb size for both high beam and low beam functions. The replacement chart covers 2016 through 2018 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 9003 bulb is the sole type specified for the Moto Guzzi V9 across all listed model years and headlight positions, covering both high beam and low beam functions for 2016-2018.
The 9003 is a dual-filament halogen bulb, meaning a single physical bulb contains two separate filaments: one rated at 60W for high beam output and one at 55W for low beam output.
Because the 9003 serves both the high beam and low beam positions on the V9, both headlight circuits draw from the same bulb unit, which is a common arrangement in single-headlight motorcycle designs.
The 9003 operates on a 12V electrical system, consistent with the standard voltage architecture found in most production motorcycles of this period.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm collar. This base type determines physical fitment into the headlight housing and is not interchangeable with other base configurations without modification.
The 9003 is defined under ANSI standards and is the designated designation used in the United States and Canada. It is functionally equivalent to the H4 bulb used under European and international standards, sharing the same dual-filament design and P43t base, though the designations originate from different standardization bodies.