Ski-Doo Summit 500 Brake Bulb Size

Additional Notes

• The 1157 is the sole brake bulb size listed for the Ski-Doo Summit 500 across all specified model years, covering 1996-1998 and 2001-2002.
• The 1157 is an ANSI-standardized bulb recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical parameters shared by all compliant manufacturers.
• As a dual-filament bulb, the 1157 contains two separate tungsten filaments within a single glass envelope, allowing it to serve two distinct lighting functions at different brightness levels from one socket.
• The 1157 operates on a 12-volt circuit and draws 21 watts on its high-intensity filament and 5 watts on its low-intensity filament, with the higher wattage filament typically associated with the brake or stop function.
• The 1157 uses a BAY15d bayonet base, which features two offset pins positioned at different heights on the base. This asymmetric pin arrangement is a deliberate anti-rotation design that prevents the bulb from being inserted in the wrong orientation, ensuring each filament connects to its correct circuit.
• The BAY15d base is not interchangeable with single-filament bayonet bases such as the BA15s, which shares a similar form but lacks the second pin required for dual-filament operation. Substituting an incompatible base type would result in incorrect circuit connections.