Ford B-600 Back Up Light Bulb Size

The Ford B-600 back up light requires a bulb size of 1156 for the rear exterior lighting system. Data for the specified component covers the range from 1980 to 1994.

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
1980-1994	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 Ford B-600 uses the 1156 bulb for its back up light across the 1980-1994 model years.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are governed by a recognized North American standard shared across the United States and Canada.
The 1156 operates at 12 volts and 21 watts, placing it in the range typical of single-filament automotive signal and reverse lighting applications.
As a single-filament bulb, the 1156 serves one lighting function only, which is consistent with its role in a dedicated back up light circuit.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width.
The BA15s base type is not interchangeable with the BA15d base, which is a dual-contact variant. Substituting one for the other is not possible without a socket modification.
The 1156 is sometimes cross-referenced with the 7506 bulb in international markets, though fitment should be confirmed against socket and voltage compatibility before substitution.