Ducati Monster S4 front turn signal bulbs use 5008 size, while rear turn signal bulbs use either 5008 or 232 size. The replacement chart covers 2004 through 2007 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 5008 is an ANSI-standard single-filament bulb with a BA15s bayonet base, rated at 12V, and is classified as a lower wattage variant of the 1156.
The 232 is an ANSI-standard festoon bulb with an SV8.5 base, rated at 12V and 3W.
The BA15s bayonet base on the 5008 features a single contact pin, which distinguishes it from dual-contact bayonet bases and makes it incompatible with sockets designed for those configurations.
The Ducati Monster S4 front turn signals use the 5008 bulb across all four model years covered, spanning 2004-2007.
The rear turn signal position does not use a uniform bulb size across all covered years. The 2006 model year specifies the 232 festoon bulb, while the 2004-2005 and 2007 model years specify the 5008.
Because the 232 festoon bulb and the 5008 bayonet bulb use entirely different base types, the two are not interchangeable, and substituting one for the other in the rear turn signal socket is not possible without modification.
The 5008 and 1156 share the same BA15s bayonet base, but they differ in wattage. This distinction is relevant when considering cross-compatibility, as the higher wattage draw of the 1156 may affect the turn signal circuit on vehicles specifying the 5008.