Chevrolet Blazer Courtesy Bulb Size

The Chevrolet Blazer courtesy light utilizes bulb sizes 168, 212-2, 1003, 211-2, and 105 depending on the specific version. Available data covers a range from 1969 through 2003.

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
1998-2003	168
1997	212-2
1996	1003
1995	212-2
1993-1994	168
1992	211-2
1987-1991	1003
1974	105
1973	212-2
1969-1972	211-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	105

Other Locations

Additional Notes

The bulb size 168 is the most frequently specified courtesy bulb across the Chevrolet Blazer model years listed, appearing in 1992-1994 and 1998-2003. It is a T10 miniature wedge bulb rated at 12V and 4.9W, making it the lowest-wattage type found in these specifications.
The 1003 bulb is specified for the Chevrolet Blazer from 1987-1991. It uses a BA15s single-contact bayonet base and operates at 12V with a 21W output, the highest wattage among all bulb types listed in these specifications.
The 211-2 and 212-2 are both festoon-type bulbs with a 41mm length and SV8.5 base, each rated at 12V and 12W. Despite sharing identical physical and electrical characteristics, they carry distinct ANSI part numbers and are listed separately across different model years.
Because the 211-2 and 212-2 share the same base type, voltage, wattage, and physical length, substitution between them is a practical consideration, though the specifications list them as separate part numbers for specific years.
The 105 bulb, specified for the 1974 Blazer, uses the same BA15s bayonet base as the 1003 but is rated at 13W rather than 21W. It is noted as a variant of the 1156 bulb family, which means physical fitment with other BA15s bulbs is possible, but wattage differences would affect light output.
The wedge base of the 168 bulb is not interchangeable with the bayonet base of the 1003 or 105, nor with the festoon-style SV8.5 base of the 211-2 and 212-2. Each base type requires a physically distinct socket, so cross-type substitution is not possible without socket modification.
All five bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating consistent regulatory compliance across the full range of model years listed.
The 1996 Blazer is specified with the 1003 bulb, while the adjacent 1995 and 1997 model years use the 212-2. These three years represent three different bulb types in close succession, which reflects non-uniform courtesy bulb fitment across that period of the model's production.