Plymouth Grand Voyager Map Light Bulb Size

The Plymouth Grand Voyager map light requires bulb sizes 578, 906, and 912 depending on the specific version of the vehicle. The provided data covers a range from 1987 to 2000.

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	578
1993-1995	906
1987-1992	912

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W.	912

Other Locations

Additional Notes

The Plymouth Grand Voyager map light bulb specifications cover model years 1987 through 2000 and reference three distinct bulb types: 578, 906, and 912.
The 578 is a festoon-style bulb with a 41mm length and end-cap contacts, operating at 12V and 12W. Festoon bulbs seat into spring-loaded clips at each end rather than a socket, which distinguishes their installation from wedge-type bulbs.
The Plymouth Grand Voyager uses the 578 bulb for its map light across the 1996-2000 model years.
The 906 is a miniature wedge bulb of the T10 designation, rated at 12V and 8W. The wedge base is held in place by friction within its socket, with no separate locking mechanism.
The 906 bulb applies to the 1993-1995 model years.
The 912 is a T15 wedge bulb rated at 12V and 12W. It is noted as a variant of the 921 bulb, meaning the two share a similar form but differ in wattage, with the 921 typically rated at 18W.
The 912 bulb is specified for the 1987-1992 model years.
All three bulb types carry ANSI standardization for the US and Canadian markets, meaning they conform to defined performance and dimensional standards rather than being proprietary specifications.
The 578 and 912 share the same 12V and 12W ratings, but their physical forms are entirely different. The 578 is a festoon type while the 912 is a wedge type, making them non-interchangeable despite identical electrical ratings.
The 906 draws less wattage than either the 578 or the 912, operating at 8W versus 12W, which reflects a lower current draw at the same 12V supply.