The Moto Guzzi 1100 California uses 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1995-1996 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 bulb type listed across all headlight positions in these specifications. It is a dual-filament halogen bulb, meaning a single unit contains two separate filaments to serve both high beam and low beam functions.
The 9003 operates at 12 volts and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament. These values reflect standard halogen output levels for motorcycle headlight applications of this period.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm flange. This base type is standardized, and physical fitment depends on matching this base configuration precisely.
The 9003 designation follows the ANSI standard used in the United States and Canada. It is functionally equivalent to the European H4 bulb, though the two designations originate from different regional standards bodies. Substituting one for the other requires confirming that the base and electrical ratings match the socket in use.
The Moto Guzzi 1100 California uses the 9003 bulb for both the high beam and low beam headlight positions across the 1995-1996 model years covered in these specifications. Because both positions share the same bulb type, a single replacement bulb serves either function.