Polaris Star Brake Bulb Size

The Polaris Star brake light utilizes a 90 bulb size for illumination purposes. Available information covers a span of time from 1983 through 1990 for the specified vehicle.

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
1983-1990	90

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90

Other Locations

Additional Notes

The bulb size 90 is the sole brake bulb specification listed for the Polaris Star across all recorded model years from 1983 to 1990.
The 90 bulb follows the ANSI standard, which is the American National Standards Institute designation used in the United States and Canada to define bulb performance and dimensional criteria.
It operates on a 12-volt electrical system and draws 13 watts, placing it in the low-wattage range typical of brake and signal lighting applications.
The 90 bulb uses a single filament, meaning it serves one lighting function only, as opposed to dual-filament bulbs that can handle two functions such as brake and tail lighting simultaneously.
The base type is BA15s, a bayonet-style mount with a 15mm collar and a single contact pin. The "s" designation indicates a single contact at the base, consistent with the single-filament construction.
The BA15s bayonet base requires a quarter-turn locking motion for installation and is not interchangeable with BA15d bases, which carry two offset pins and are designed for dual-filament bulbs.