The Chevrolet Spectrum front and rear side marker bulbs both utilize a 194 size bulb for proper illumination. The replacement chart covers 1985 to 1988 vehicle 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 194 bulb is the sole bulb type specified for the Chevrolet Spectrum across all side marker positions for the 1985-1988 model years.
The 194 bulb conforms to the ANSI standard recognized in both the United States and Canada, placing it within a regulated specification framework for miniature automotive lighting.
It is classified as a T10 miniature wedge bulb, a form factor defined by a wedge-shaped base that seats directly into a socket without a separate metal cap or bayonet pin.
The T10 designation refers to the bulb's tubular envelope width, expressed in eighths of an inch, making it a relatively compact light source suited to side marker housings.
The 194 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles of this era.
Its rated wattage of 3.78W places it in the low-power category, reflecting the limited current draw typical of side marker applications.
The same bulb size, 194, is specified for both the front and rear side marker positions on the Chevrolet Spectrum, indicating full interchangeability between those two locations on the vehicle.
Because the 194 uses a wedge base rather than a indexed or keyed fitting, physical installation orientation is determined by the socket housing rather than the bulb itself.