Jeep M151 Back Up Light Bulb Size

The Jeep M151 back up light requires either a 1156 or 1073 bulb size depending on the specific vehicle configuration. The replacement chart covers vehicle production years spanning 1965 to 1972 with corresponding bulb size specifications.

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
1972	1156
1968	1073
1965-1967	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. Lower wattage variant of 1156. 12V, 13W.	1073

Other Locations

Additional Notes

The 1156 bulb is the most frequently specified backup light bulb across the Jeep M151 model years covered, appearing in 1965-1967 and 1972.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The BA15s bayonet base uses a single contact pin, which locks the bulb into its socket with a push-and-twist motion.
The 1073 bulb is specified for the Jeep M151 in 1968 and shares the same BA15s bayonet base as the 1156.
Although the 1073 and 1156 share the same base type, they are not identical in output. The 1073 operates at 12V and 13W, while the 1156 operates at 12V and 21W, making the 1073 a lower-wattage variant.
The wattage difference between the two bulbs means the 1073 produces less light output than the 1156, which is a relevant consideration for backup light visibility.
Both the 1156 and 1073 conform to ANSI standards applicable in the United States and Canada.
Despite sharing a base type, substituting a 1156 for a 1073 in a year where the lower-wattage bulb is specified may place unintended electrical load on the circuit.