Ford C7000 Back Up Light Bulb Size

The Ford C7000 back up light utilizes bulb size 1156 for the rear illumination system. Data for the specified component covers the period from 1971 through 1986.

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
1980-1986	1156
1971	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 1156 is the sole back up light bulb size listed for the Ford C7000 across all model years in the specifications.
The Ford C7000 uses the 1156 bulb for model years 1980-1986 and 1971.
The 1156 is an ANSI-standardized bulb recognized in both the United States and Canada.
As a single-filament bulb, the 1156 serves one dedicated function rather than splitting duties across multiple circuits, which is consistent with its application in a back up light.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and rotated to lock into place.
The 1156 operates at 12 volts and 21 watts, which are standard ratings for automotive incandescent bulbs in this application.
The BA15s base designation indicates a single-contact bayonet fitting with a 15mm base width, distinguishing it from the dual-contact BA15d variant used in other bulb types.
The 1157, a common point of confusion, shares the same BA15 base family but features a dual-filament design and dual-contact base, making it a non-interchangeable substitute for the single-contact 1156 in the Ford C7000.