Polaris 600 Brake Bulb Size

The Polaris 600 brake light utilizes a 90 bulb size for the specific lighting components listed in the provided technical data. Information for the specified vehicle covers the period from 1985 through 1987.

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
1985-1987	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 bulb type 90 is an ANSI-standardized single-filament bulb rated at 12 volts and 13 watts, fitted with a BA15s bayonet base. The BA15s designation indicates a single-contact bayonet cap with a 15mm base width, which is a non-indexed base style meaning it can be inserted in any rotational orientation.
The Polaris 600 uses the type 90 bulb for its brake light across the 1985-1987 model years. The BA15s base is not interchangeable with the BA15d double-contact bayonet base, and substituting one for the other is not possible without modification.
The single-filament construction of the type 90 bulb means it serves one lighting function only. This contrasts with dual-filament bulbs, which share a single housing for two separate functions such as braking and running lights.
At 13 watts on a 12-volt circuit, the type 90 draws approximately 1.08 amperes. This draw is relevant when assessing socket and wiring compatibility during a bulb replacement.