The Chevrolet P60 front and rear side marker bulbs utilize 1157 and 194 sizes, with both bulb configurations appearing in the specifications. The replacement chart covers 1983 to 1988 vehicle production years and contains bulb size specifications for side marker applications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet P60 front side marker position uses two distinct bulb types across the 1983-1988 model years, with the 1157 appearing in five of the six years listed and the 194 specified exclusively for the 1984 model year.
The 1157 is a dual-filament bulb operating at 12 volts with a BAY15d bayonet base, rated at 21W on its primary filament and 5W on its secondary filament. Its dual-filament design is a defining characteristic that distinguishes it from single-filament alternatives.
The 194 is a single-filament miniature wedge bulb of the T10 type, operating at 12 volts and rated at 3.78W. Its wedge base design is physically incompatible with the BAY15d bayonet socket used by the 1157.
Because the 1157 and 194 use fundamentally different base types, one cannot be substituted for the other without a socket adapter or wiring modification. The two bulbs are not interchangeable.
The Chevrolet P60 rear side marker position shows greater variation across the same model range, with the 194 specified for 1983, 1984, and 1988, while the 1157 is specified for 1985-1987.
The 1984 Chevrolet P60 is the only year in this specification set where both the front and rear side marker positions share the same bulb type, with the 194 listed for both positions.
The 1988 Chevrolet P60 presents a split configuration, with the larger 1157 at the front side marker position and the smaller 194 at the rear side marker position.
Both the 1157 and 194 conform to ANSI standards recognized in the United States and Canada, meaning their electrical and physical specifications are standardized across manufacturers producing bulbs under those designations.
The wattage difference between the two bulb types is substantial. The 1157 draws up to 21W on its main filament, while the 194 draws only 3.78W, reflecting their different roles and socket requirements within a vehicle's lighting circuit.
For the 1983 Chevrolet P60, the front side marker uses the 1157 while the rear side marker uses the 194, meaning the two positions on the same vehicle require different bulb types and different socket configurations.