GMC P4500 Instrument Panel Bulb Size
The GMC P4500 instrument panel utilizes unique bulb sizes 161, 168, 194, and 1893 for the internal illumination components. Data for the specified lighting hardware covers the range from 1979 to 1990.
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 |
|---|---|
| 1989-1990 | 161 (Medium Duty) |
| 1987-1988 | 194 |
| 1986 | 168 (Medium Duty) |
| 194 (Medium Duty, With 2 Rectangular Headlights) | |
| 1984-1985 | 194 |
| 1983 | 161 (Medium Duty) |
| 194 (Medium Duty, With 2 Rectangular Headlights) | |
| 1982 | 194 (Medium Duty) |
| 161 (Medium Duty, With 2 Rectangular Headlights) | |
| 1981 | 194 |
| 1980 | 161 |
| 1979 | 1893 (Medium Duty) |
| 194 (Medium Duty, With 2 Rectangular Headlights) |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 1W. | 161 |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W. | 194 |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W. | 168 |
| ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W. | 1893 |