Ford E-100 Back Up Light Bulb Size

Ford E-100 back up light bulb specifications include 1156 and 199 sizes. The replacement chart covers vehicle production years spanning 1972 to 1983.

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
1973-1983	1156
1972	199

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	199

The Ford E-100 back up light specifications cover model years 1972-1983.
The 1156 bulb is the back up light fitment for the Ford E-100 across 1973-1983.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
A BA15s bayonet base uses a single contact pin, which corresponds to the single-filament design of the 1156.
The 1972 Ford E-100 uses the 199 bulb rather than the 1156 for its back up light.
The 199 is also an ANSI-standard single-filament bulb rated at 12V and 21W with a BA15s bayonet base, and is classified as a variant of the 1156.
Although the 199 and 1156 share the same base type, voltage, wattage, and filament count, they are distinct ANSI designations, and substitution between them warrants verification before fitment.