The GMC Caballero front and rear side marker bulbs both utilize a 194 bulb size across all configurations. The replacement chart covers vehicle production spanning 1978 to 1987 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The GMC Caballero uses the 194 bulb for its front side marker across all listed model years from 1978-1987.
The 194 bulb is an ANSI-standardized type recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared by multiple manufacturers.
The 194 is classified as a miniature wedge bulb in the T10 form factor. The wedge base design means the bulb is held in its socket by the tension of the base itself rather than by a separate bayonet or screw mechanism.
The 194 operates at 12 volts and draws 3.78 watts, placing it in the low-wattage range typical of marker and courtesy lighting applications rather than primary illumination.
The rear side marker position on the GMC Caballero also uses the 194 bulb for the 1978-1979 model years, making the front and rear side marker positions interchangeable in terms of bulb fitment for those years.
Because the 194 is an ANSI-standardized type, aftermarket and OEM replacements from different suppliers are generally expected to share the same electrical ratings and T10 wedge base configuration, provided they carry the same ANSI designation.