Subaru Brat Back Up Light Bulb Size

The Subaru Brat back up light utilizes the 1156 bulb size for specific applications within the provided technical data. Information for the lighting components covers the range from 1978 to 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 Size
1978-1987	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Subaru Brat uses the 1156 bulb for its back up lights across all listed model years, spanning 1978-1987.
The 1156 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
This bulb operates on a 12-volt electrical system, which is consistent with standard automotive DC voltage.
The 1156 carries a 21-watt rating, placing it in the mid-range of incandescent automotive bulb wattages.
The 1156 uses a BA15s bayonet base, which is a single-contact bayonet mount. The "s" in BA15s denotes a single contact point at the base, as opposed to the dual-contact BA15d found on other bulb types.
Because the 1156 is single-filament, it serves only one lighting function per socket. It is not interchangeable with dual-filament bayonet bulbs such as the 1157, which shares the same BA15 base family but carries a second contact and filament for a separate function.