Mercury Cyclone Engine Compartment Light Bulb Size
The Mercury Cyclone engine compartment light requires bulb size 631 or P21W depending on the specific application. Data for the listed components covers the period from 1964 to 1970.
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 |
|---|---|
| 1967-1970 | 631 |
| 1964-1966 | P21W |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W. | 631 |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W |