GMC C2500 Suburban Courtesy Bulb Size
The GMC C2500 Suburban courtesy bulb utilizes 3 distinct sizes: 168, 561, and 194, with each bulb size corresponding to specific applications within the vehicle's interior lighting system. The replacement chart documents courtesy bulb specifications across the 1979 to 1999 production range for this model.
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 |
|---|---|
| 1999 | 168 |
| 1998 | 561 |
| 1996-1997 | 194 |
| 1995 | 168 |
| 1993-1994 | 1003 |
| 1992 | 168 |
| 1985-1986 | 168 |
| 1984 | 1003 |
| 1983 | 1004 |
| 1980 | 161 |
| 1979 | 1156 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W. | 168 |
| ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W. | 561 |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W. | 194 |
| 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). Miniature wedge bulb (T10). 12V, 1W. | 161 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1156 |