The Chevrolet C50 front and rear side marker bulb size specifications include 1157 and 194 bulb options. The replacement chart covers vehicle production years spanning 1960 to 1988.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet C50 front side marker position uses the 1157 bulb across nearly all model years in the specifications, making it the dominant fitment for that position.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with filaments drawing 21W and 5W respectively. Its two-filament design is what distinguishes it from single-filament marker bulbs.
The 194 is a miniature wedge-style T10 bulb rated at 12V and 3.78W, a single-filament unit with significantly lower wattage than the 1157. Both types conform to ANSI standards applicable in the United States and Canada.
The rear side marker position on the Chevrolet C50 uses the lower-output 194 bulb across the majority of model years covered, reflecting a common practice of using lower-wattage wedge bulbs in rear marker applications.
The 1157 and 194 use physically incompatible bases. The 1157 requires a BAY15d bayonet socket, while the 194 uses a wedge-type socket, meaning the two types are not interchangeable regardless of voltage compatibility.
The Chevrolet C50 front side marker for the 1984 model year specifies the 194 bulb rather than the 1157 used in surrounding years, indicating a socket difference specific to that year's front marker housing.
The rear side marker for the 1985 and 1987 model years specifies the 1157 rather than the 194 used in adjacent years, indicating those specific model years require a BAY15d bayonet socket in the rear marker position.