Ski-Doo Formula SL Tail Light Bulb Size

The Ski-Doo Formula SL tail light requires a 1157 bulb size for proper illumination and function. Data for the specific component covers the period from 1995 through 1999.

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
1995-1999	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

Other Locations

Additional Notes

The 1157 is the sole bulb type listed across all tail light positions in these specifications, covering the Ski-Doo Formula SL for model years 1995-1999.
The 1157 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, one rated at 21 watts and one at 5 watts, allowing it to serve both a higher-intensity stop function and a lower-intensity running light function simultaneously.
The bulb operates on a 12-volt electrical system, which is standard for powersports and automotive applications of this era.
The 1157 uses a BAY15d bayonet base, a two-pin offset base design that prevents incorrect insertion by positioning the two locating pins at different heights, ensuring polarity alignment with the socket.
The 1157 designation follows the ANSI standardization system recognized in both the United States and Canada, meaning the bulb is subject to defined performance and dimensional tolerances under that standard.
Because the 1157 is a dual-filament type, substituting it with a single-filament equivalent such as the 1156 would result in the loss of one lighting function, as the 1156 shares the same bayonet base style but lacks the second filament.