Hino SF17 front side marker bulbs use 194 or P21W size, while rear side marker bulbs use 67 size. The replacement chart covers 1988 to 1991 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hino SF17 front side marker position uses two distinct bulb types across its model years, with the 194 fitted to 1989-1991 models and the P21W fitted to the 1988 model.
The 194 is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, and is classified for use in the US and Canada.
The P21W follows the ECE standard used in Europe and worldwide, operates at 12V and 21W, and uses a BA15s single-contact bayonet base, making it a significantly higher-wattage front side marker than the 194 it replaced in later SF17 model years.
The BA15s bayonet base of the P21W is a single-contact fitting, which is a relevant interchangeability factor when sourcing a replacement for the 1988 Hino SF17 front side marker.
The rear side marker position on the Hino SF17 uses the 67 bulb across all listed model years, specifically 1989-1991.
The 67 is an ANSI-standard single-filament bulb rated at 12V and 8W, and it also uses a BA15s bayonet base, the same base type as the P21W used in the 1988 front side marker position.
Despite sharing a BA15s base with the P21W, the 67 and P21W are not interchangeable due to their substantial wattage difference, 8W versus 21W, which reflects different current draws and light output levels.
The 67 is described as a lower-wattage variant of the 1156 bulb, meaning it shares the same base and general form but draws less power, a distinction relevant to socket and circuit compatibility.
The front side marker position on the 1988 SF17 uses a bulb governed by ECE standards, while the same position on 1989-1991 models uses an ANSI-standard bulb, indicating a change in the regional specification basis between those model years.
The 194 wedge bulb uses no base pin or bayonet fitting, relying instead on its wedge-shaped plastic base for retention, which differs structurally from the BA15s base found on both the 67 and P21W bulbs also listed in these specifications.