The GMC Sonoma side marker utilizes a 194 bulb size for illumination purposes. Data for the specific component covers the range from 1995 through 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The GMC Sonoma uses the 194 and 194NA bulb types across its front and rear side marker positions, both of which follow the ANSI standard recognized in the United States and Canada.
Both the 194 and 194NA are T10 miniature wedge bulbs operating at 12 volts with a power draw of 3.78 watts, making them identical in electrical and physical form.
The sole distinction between the two types is that the 194NA features natural amber-tinted glass, while the standard 194 uses clear glass.
The GMC Sonoma front side marker uses the 194NA for the 2002-2004 model years, meaning those positions require a bulb that produces an amber output through its tinted glass rather than through a colored lens alone.
The front side marker for the 1991-2001 model years uses the standard clear 194 bulb, indicating that amber output in those earlier model years was achieved through the lens rather than the bulb itself.
Because the 194 and 194NA share the same T10 wedge base and electrical ratings, one will physically seat in the socket of the other, which creates a risk of installing a clear bulb where an amber-tinted one is specified, or vice versa.
The rear side marker across all listed years, spanning 1999-2004, uses the standard clear 194 bulb without exception.
The T10 wedge base format means the bulb is retained by the tension of the socket contacts alone, with no separate locking mechanism or bayonet pins involved in the fitment.