The Chevrolet S10 side marker requires a 194 bulb size for the lighting components located on the exterior of the vehicle. Data for the specified component covers the range from 1995 to 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet S10 uses the 194 bulb as the dominant side marker bulb type across both front and rear positions, spanning model years 1982-2004.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, conforming to the ANSI standard recognized in both the United States and Canada.
The T10 wedge base design requires no locking tabs or twist to seat, relying instead on socket tension to hold the bulb in place.
For the 2004 Chevrolet S10, the front side marker position calls for the 194NA rather than the standard 194 used in all prior model years.
The 194NA shares the same T10 wedge form factor, voltage, and wattage as the 194, but its glass envelope is tinted natural amber to produce a yellow-orange output without a separate colored lens.
Because the 194NA and 194 are electrically and physically identical, the distinction between them is optical rather than mechanical, meaning the socket fitment is the same for both.
The rear side marker position on the 2004 model retains the standard 194, while only the front position requires the amber-tinted 194NA, indicating a position-specific optical requirement for that year.
Substituting a clear 194 in a front side marker application designed for the 194NA would alter the color output of that position, as the amber tint is built into the 194NA bulb itself rather than the housing lens.
The 3.78W power draw of the T10 194 series places it in the low-wattage category typical of marker and courtesy lighting, as opposed to the higher wattage bulbs used in headlamp or brake lamp applications.
The rear side marker specifications for the S10 list no equivalent to the 194NA, meaning the amber filtering for rear marker output on applicable years is handled by the lens assembly rather than the bulb.