The Evobus S 417 turn signal utilizes a 7440 bulb size for the specific lighting component located on the exterior of the vehicle. Available data covers the range from 2003 through 2018 for the specified equipment.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Evobus S 417 uses the 7440 bulb across all three turn signal positions, front, rear, and side of bus, for every model year from 2003-2018.
The 7440 is an ANSI-standardized bulb type recognized across the United States and Canada, which reflects its use in a vehicle intended for the North American market.
The 7440 is a single-filament wedge bulb, meaning it controls only one lighting function per socket, in this case the turn signal circuit exclusively.
The T20 designation refers to the bulb's wedge base form factor, a common base type in automotive signaling applications that seats directly into a wedge-style socket without a separate metal base.
The 7440 operates at 12 volts and 21 watts, which is a standard output level for automotive turn signal bulbs and produces sufficient luminosity for signaling visibility.
Because the same 7440 specification applies to the front, rear, and side-of-bus positions across the full 2003-2018 production span of the Evobus S 417, a single bulb type serves all turn signal sockets on the vehicle.
The single-filament construction of the 7440 distinguishes it from dual-filament variants such as the 7443, which shares the same T20 wedge base but carries two filaments for combined stop and turn signal functions. The two types are not interchangeable despite their physical similarity.