Ski-Doo Summit 550 Fan Brake Bulb Size

The Ski-Doo Summit 550 Fan brake utilizes 1157 and P21/5W bulb sizes according to the provided technical data. Information for the specified component covers the period from 2003 through 2009.

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
2003-2009	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 Ski-Doo Summit 550 Fan uses the 1157 bulb for its brake light across the 2003-2009 model years.
The 1157 is an ANSI-standardized bulb type recognized across the United States and Canada, establishing a consistent specification for fitment and replacement.
As a dual-filament bulb, the 1157 contains two separate filaments within a single envelope, operating at different wattages depending on the active circuit.
The 1157 operates on a 12-volt system, with the higher-output filament rated at 21 watts for the brake function and the lower-output filament rated at 5 watts for the running light function.
The 1157 uses a BAY15d bayonet base, which features two offset pins at different heights on the base, a design that prevents incorrect single-filament bulbs from being seated in the socket.
The offset pin configuration of the BAY15d base is a deliberate fitment control, as a single-filament BA15s or BA15d bulb is not interchangeable with the 1157 despite sharing a similar bayonet-style mounting format.