GMC C3500HD Check Engine Bulb Size
The GMC C3500HD check engine light requires bulb size 74 or 194 depending on the specific instrument cluster configuration. Data for the light covers the range from 1991 through 1997.
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 |
|---|---|
| 1993-1997 | 74 |
| 1991 | 194 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W. | 74 |
| ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W. | 194 |