Polaris 800 XC Brake Bulb Size

The Polaris 800 XC brake light utilizes 3157 and 921 bulb sizes for the lighting components. Data for the specific bulb requirements covers the range from 2003 to 2004.

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
2004	3157 (With Adjustable Seat)
2004	921 (With Fixed Seat)
2003	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 3157 is a dual-filament wedge bulb classified under the T25 body type. It operates at 12 volts and carries two wattage ratings, 27W for the high-intensity filament and 7W for the low-intensity filament. This dual-filament design allows a single bulb to serve both brake and running light functions within one housing.
The 921 is a single-filament wedge bulb classified under the T15 body type. It operates at 12 volts with a fixed output of 16W. Unlike the 3157, it serves only one lighting function per circuit.
Both the 3157 and 921 conform to ANSI standards recognized in the United States and Canada, meaning their physical and electrical specifications follow a defined industry standard rather than a proprietary format.
The Polaris 800 XC uses different brake bulb sizes depending on seat configuration in the 2004 model year. Units with an adjustable seat take the 3157, while units with a fixed seat take the 921.
The T25 and T15 designations refer to the wedge base body types of the 3157 and 921 respectively. These two body types are not interchangeable, as they differ in physical size and pin configuration.
The 3157 and 921 also differ in electrical draw. The 3157 pulls up to 27W on its primary filament, while the 921 draws 16W. Substituting one for the other would result in a mismatch with the circuit's intended load.
The 2003 Polaris 800 XC uses the 921 bulb for the brake light, which is the same bulb specified for the fixed seat variant of the 2004 model year.