Kenworth K150 front and rear side marker bulbs utilize 1157, 904, and 67 sizes, with the bulb size varying by marker location and application. The replacement chart covers 1990 through 1994 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 Kenworth K150 front and rear side marker positions draw from three distinct bulb types across the 1990-1994 model years: the 1157, 904, and 67.
The 1157 is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base. Its dual-filament design distinguishes it from the single-filament bulbs also present in these specifications.
The 904 is a miniature wedge-style bulb in a T10 form factor, rated at 12V and 8W. Its wedge base requires no locking rotation during installation, as the socket retains it by friction alone.
The 67 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 8W. It is described as a lower wattage variant of the 1156, meaning it shares the same base type but operates at reduced power output.
All three bulb types conform to ANSI standards applicable in both the United States and Canada.
The BAY15d base of the 1157 and the BA15s base of the 67 are physically similar in appearance but are not interchangeable. The BAY15d base has offset locating pins to accommodate its dual-filament design, while the BA15s base has symmetrical pins suited to a single-filament circuit.
The 904 wedge base is incompatible with the bayonet sockets used by the 1157 and 67, as the retention and contact mechanisms differ entirely between wedge and bayonet base types.
The front side marker position on the Kenworth K150 uses the 1157 in 1990, 1992, and 1994, while the 904 and 67 each appear in one of the remaining years, indicating that the front position is not standardized to a single bulb type across this production span.
The rear side marker position uses the 904 in 1990, 1991, and 1994, and the 67 in 1992 and 1993, with no instance of the 1157 appearing in the rear position across these years.
Because the front and rear positions on the same model year do not consistently share the same bulb type, a single replacement bulb does not serve both positions in most of the listed years.