Ford B-600 Parking Light Bulb Size

The Ford B-600 parking light requires a 1157 bulb size for proper installation and function within the lighting assembly. Available data covers the production range from 1980 through 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	1157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157

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Additional Notes

The Ford B-600 parking light uses the 1157 bulb across all listed model years from 1980-1994.
The 1157 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.
The 1157 is a dual-filament bulb, which means it contains two separate filaments within a single housing, allowing it to serve two distinct lighting functions from one unit.
The bulb operates on a 12-volt electrical system, consistent with the standard automotive electrical architecture found in most passenger and commercial vehicles of this era.
The two filaments in the 1157 are rated at 21 watts and 5 watts respectively, with the higher-wattage filament typically associated with brighter signaling functions and the lower-wattage filament used for a reduced-intensity mode.
The 1157 uses a BAY15d bayonet base, a two-pin offset base design. The offset pin placement is a deliberate fitment feature that prevents incorrect insertion orientation during installation.
Because the BAY15d base uses offset pins, a 1157 bulb is not physically interchangeable with single-filament bayonet bulbs that use a symmetrical two-pin base, such as the BAY15s type found on bulbs like the 1156.