GMC K35 Turn Signal Bulb Size
GMC K35 front and rear turn signal bulbs utilize 198, 1156, and 199 sizes, with front applications requiring 198 or 1156 bulbs and rear positions accommodating 198, 1156, or 199 bulbs. The replacement chart covers 1968 through 1978 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Turn Signal
| Years | Bulb Size |
|---|---|
| 1977-1978 | 198 |
| 1973-1974 | 198 |
| 1968-1972 | 1156 |
Rear Turn Signal
| Years | Bulb Size |
|---|---|
| 1977-1978 | 198 |
| 1973-1974 | 198 |
| 1970-1972 | 1156 |
| 1969 | 199 |
| 1968 | 1073 |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W. | 198 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1156 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W. | 199 |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W. | 1073 |