Plymouth Satellite Back Up Light Bulb Size

The Plymouth Satellite back up light uses 1156, P21W, and 1073 bulb sizes depending on the specific version of the vehicle. Available data for the lighting components covers the range from 1965 to 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

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 Satellite uses the 1156 bulb for the back up light across the 1966-1974 model years, while the 1965 model year uses the 1073 bulb instead.
Both the 1156 and 1073 are ANSI-standardized bulbs recognized in the US and Canada, each operating on a 12-volt electrical system.
The 1156 is a single-filament bulb rated at 21 watts, mounted on a BA15s bayonet base.
The 1073 shares the same BA15s bayonet base and single-filament construction as the 1156, but is rated at a lower 13 watts.
The BA15s bayonet base uses a single contact pin, which physically distinguishes it from dual-pin bayonet variants and determines socket compatibility.
Although the 1073 and 1156 share the same base type, the wattage difference between the two means they are not interchangeable without accounting for the variation in light output and current draw.