Plymouth Barracuda Back Up Light Bulb Size

The Plymouth Barracuda back up light utilizes 1156, 1073, and P21W bulb sizes depending on the specific production requirements for the vehicle. Data for the lighting components covers the period from 1964 through 1974.

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
1966-1974	1156
1965	1073
1964	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 Plymouth Barracuda uses the 1156 bulb for the back up light across most of its model years, specifically 1964 and 1966-1974.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base.
The BA15s bayonet base features a single contact at the base, which corresponds directly to the single-filament design of the 1156.
The 1965 Plymouth Barracuda is the only model year in these specifications to use the 1073 bulb rather than the 1156.
The 1073 shares the same BA15s bayonet base and 12V operating voltage as the 1156 but draws significantly less power at 13W versus 21W.
Despite the shared base type between the 1073 and 1156, the wattage difference means the two bulbs are not direct equivalents, and substituting one for the other affects light output.