Plymouth Voyager Back Up Light Bulb Size

The Plymouth Voyager back up light utilizes 3057, 921, 1156, and P21W bulb sizes depending on the specific version required for the rear illumination system. Available data covers the range from 1984 through 2000 for the various components listed in the provided 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
1996-2000	3057
1991-1995	921
1984-1990	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3057
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Plymouth Voyager back up light specifications cover model years 1984 through 2000 and reference three distinct bulb sizes across that span: the 1156, the 921, and the 3057.
The 1156 bulb is a single-filament type with a BA15s bayonet base, rated at 12V and 21W. The BA15s designation indicates a single-contact bayonet fitting, which is not interchangeable with dual-contact bayonet bases.
The Plymouth Voyager used the 1156 bulb for back up lights across the 1984-1990 model years.
The 921 is a single-filament wedge bulb of the T15 size class, rated at 12V and 16W. Its wedge base design requires no locking pins or bayonet rotation to seat, relying instead on socket tension.
The 921 bulb was specified for the Voyager's back up lights during the 1991-1995 model years, representing a base-type change from the bayonet-style 1156 used in earlier years.
The 3057 is a dual-filament wedge bulb of the T25 size class, rated at 12V with a 27W main filament and a 7W secondary filament. Despite carrying two filaments, only one is relevant in a dedicated back up light circuit.
The Plymouth Voyager used the 3057 bulb for back up lights across the 1996-2000 model years.
All three bulb types, the 1156, 921, and 3057, conform to ANSI standards recognized in both the United States and Canada, meaning their electrical and physical ratings follow a standardized specification rather than a proprietary one.
The 921 and 3057 share a wedge base construction but differ in size class, T15 versus T25 respectively, making them physically incompatible with each other's sockets despite the similar base style.
The wattage ratings across the three bulbs differ notably: the 1156 draws 21W, the 921 draws 16W, and the 3057 draws up to 27W on its primary filament, which reflects differences in socket and housing design across the affected model years.