Jeep Scrambler Back Up Light Bulb Size

The Jeep Scrambler back up light utilizes bulb size 1156 and P21W for the rear illumination system. Data for the specified lighting components covers the range from 1981 through 1985.

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
1981-1985	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 Jeep Scrambler uses the 1156 bulb for the back up light across all listed model years, spanning 1981-1985.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its dedicated role as a back up light.
The 1156 operates at 12 volts and 21 watts, placing it within the standard low-voltage DC range used in automotive electrical systems.
The 1156 is built on a BA15s bayonet base, a single-contact mount that locks into the socket with a twist and is not interchangeable with dual-contact bayonet bases such as the BA15d.
The 1156 carries ANSI standardization, indicating it meets a defined set of electrical and physical specifications recognized across the United States and Canada.
Because the BA15s base is single-contact, substituting a dual-filament bulb such as the 1157, which uses a BA15d base with two contacts at different heights, would result in an incompatible fit.