GMC K25 Suburban Instrument Panel Bulb Size
The GMC K25 Suburban instrument panel requires 3 distinct bulb sizes: 1816, 1445, and 168, with each size serving specific dashboard illumination functions. The replacement chart covers vehicle production years spanning 1967 to 1978, detailing bulb specifications across the 12-year manufacturing period.
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 |
|---|---|
| 1976-1978 | 1816 |
| 1975 | 1445 |
| 1974 | 1816 |
| 1972 | 1445 |
| 1971 | 168 |
| 1969-1970 | 1445 |
| 1968 | 57 |
| 1967 | 53 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T3.25). 12V, 4W. | 1816 |
| ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W. | 1445 |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W. | 168 |
| ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W. | 57 |
| ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W. | 53 |