International L150 utilizes a 194 bulb size for front side marker applications and a 97 bulb size for rear side marker installations. The replacement chart covers 1950 to 1952 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 International L150 uses two distinct bulb types across its side marker positions for the 1950-1952 model years: the 194 at the front and the 97 at the rear.
The 194 is an ANSI-standardized miniature wedge bulb in the T10 form factor, rated at 12 volts and 3.78 watts. The T10 designation refers to a tubular bulb body roughly 10/8 of an inch wide, with a wedge-style base that seats directly into a socket without a separate locking mechanism.
The 97 is an ANSI-standardized single-filament bulb rated at 12 volts and 13 watts, fitted with a BA15s bayonet base. The BA15s designation indicates a single-contact bayonet mount with a 15mm base width, which locks into its socket with a quarter-turn motion.
The 97 is noted as a variant of the 1156 bulb. While both share the BA15s bayonet base and single-filament construction, the 97 operates at a lower wattage than the standard 1156, which is rated at approximately 26.9 watts. This wattage difference makes the two bulbs non-interchangeable in applications where circuit load or light output is a factor.
The 194 and 97 are both recognized under ANSI standards applicable in the United States and Canada, indicating conformance to a defined set of electrical and physical tolerances within those markets.
The front and rear side marker positions on the International L150 draw on bulbs with notably different wattage ratings. The rear-mounted 97 at 13 watts draws significantly more power than the front-mounted 194 at 3.78 watts, reflecting the differing visibility requirements typically associated with rear marker lighting.