Chevrolet K5 Blazer Courtesy Bulb Size
Chevrolet K5 Blazer courtesy bulb sizes include 1003, 1004, and 1156 bulb options across different model configurations. The replacement chart covers vehicle production years from 1975 to 1986 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.
Bulb Size by Year Range
| Years | Bulb Size |
|---|---|
| 1985-1986 | 1003 |
| 1984 | 1004 (With 2 Headlamps) |
| 1983 | 1003 (With 2 Headlamps) |
| 1980 | 1156 |
| 1979 | 1003 |
| 1975-1978 | 105 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1003 |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W. | 1004 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1156 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W. | 105 |