GMC C25 Instrument Panel Bulb Size
The GMC C25 instrument panel utilizes 3 distinct bulb sizes: 1816, 168, and 1445, with each size serving specific illumination functions within the dashboard assembly. The replacement chart documents vehicle production data spanning 1967 to 1978, correlating each model year to its corresponding bulb 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 |
|---|---|
| 1978 | 1816 |
| 1977 | 168 |
| 1976 | 1816 |
| 1975 | 1445 |
| 1974 | 1816 |
| 1971-1972 | 168 |
| 1970 | 1445 |
| 1969 | 161 |
| 1968 | 57 |
| 1967 | 161 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T3.25). 12V, 4W. | 1816 |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W. | 168 |
| ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W. | 1445 |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 1W. | 161 |
| ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W. | 57 |