Chevrolet S10 Map Light Bulb Size

The Chevrolet S10 Map Light utilizes 212-2, 168, and 194 bulb sizes according to the provided specifications. Data for the bulb sizes covers the range from 1987 to 2004.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2004	212-2
1998	168
1994-1997	212-2
1987-1993	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

Other Locations

Additional Notes

The Chevrolet S10 map light specifications cover model years 1987 through 2004, with three distinct bulb types used across that span: the 212-2, the 168, and the 194.
The 212-2 is a festoon-style bulb with a 41mm length and an SV8.5 base, operating at 12V and 12W. Festoon bulbs are cylindrical lamps that mount by pressing their end caps into spring clips rather than inserting into a socket.
The 194 and 168 are both T10 miniature wedge bulbs, meaning they share the same physical wedge-base form factor and T10 envelope size. However, they are not electrically identical, as the 194 draws 3.78W while the 168 draws 4.9W.
The Chevrolet S10 uses the 194 bulb for the map light across model years 1987-1993, making it the most frequently specified bulb type in these listings.
The 212-2 festoon bulb is specified for model years 1994-1997 and again for 2004, and it is physically and electrically incompatible with the T10 wedge-base 194 and 168 bulbs due to its different base type and higher wattage.
The 168 bulb appears exclusively in the 1998 model year specification. Although it shares the T10 wedge form factor with the 194, substituting one for the other involves a wattage difference that may affect circuit load.
The SV8.5 base designation on the 212-2 refers to a festoon cap width of 8.5mm, which determines socket compatibility. A festoon bulb with a different cap width would not seat correctly in the same holder.
All three bulb types listed carry ANSI standard designations valid in both the United States and Canada, indicating they conform to a shared North American specification for bulb geometry and electrical ratings.
The 12W rating of the 212-2 is notably higher than either T10 wedge type, which means the map light housing and wiring for years using the 212-2 are designed around a greater power draw than those using the 194 or 168.
Because the 212-2 festoon and the T10 wedge types differ in both base design and wattage, a direct substitution between the bulb groups used in different S10 model years is not supported by these specifications.