Jeep CJ7 Back Up Light Bulb Size

The Jeep CJ7 back up light utilizes 1156, P21W, and 199 bulb sizes according to the provided specifications for the lighting components. Available information covers the range from 1976 through 1986 for the specified vehicle and bulb types.

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
1978-1986	1156
1977	199
1976	1156

Bulb Specifications

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

Other Locations

Additional Notes

The Jeep CJ7 backup light bulb specifications cover model years 1976-1986.
The 1156 bulb is the dominant fitment across this vehicle, appearing in ten of the eleven model years listed, specifically 1976 and 1978-1986.
The 1156 is an ANSI-standard single-filament bulb rated at 12 volts and 21 watts, fitted with a BA15s bayonet base.
A BA15s bayonet base uses a single locating pin, which locks the bulb into its socket at a fixed rotational position.
The 1977 Jeep CJ7 uses the 199 bulb rather than the 1156.
The 199 is also an ANSI-standard single-filament bulb sharing the same BA15s bayonet base, 12-volt rating, and 21-watt output as the 1156, and is classified as a variant of it.
Despite their shared electrical and physical base characteristics, the 199 and 1156 are distinct ANSI designations, and fitment should follow the year-specific specification rather than assuming full interchangeability.
Both bulb types fall under ANSI standards applicable in the United States and Canada.