Polaris 400 Brake Bulb Size

The Polaris 400 brake light utilizes a 90 bulb size for the specific lighting components on the vehicle. Data for the bulb size covers the range from 1985 to 1991.

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 Type	Shop
1985-1991	90	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90	Check Price

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Additional Notes

The Polaris 400 uses the ANSI 90 bulb across all listed model years, 1985-1991, for the brake light position.
The 90 bulb is a single-filament type, meaning it serves one lighting function rather than combining two, such as brake and tail, into a single unit.
It operates on a BA15s bayonet base, a single-contact fitting where the pin is centered on the base, distinguishing it from the dual-contact BA15d variant used in twin-filament applications.
The 90 bulb is rated at 12 volts and 13 watts, placing it in the low-wattage range typical of auxiliary and signal lighting rather than primary illumination.
The ANSI 90 designation confirms the bulb meets a standardized specification recognized in both the United States and Canada, indicating consistent physical and electrical parameters across manufacturers.
Because the 90 bulb is single-filament with a BA15s base, substitution with a dual-filament bulb sharing a similar base style, such as a BA15d-based type, would result in an incompatible fit due to the differing pin configuration.