Chrysler Town & Country Map Light Bulb Size

Additional Notes

• The Chrysler Town & Country map light bulb specifications span model years 1956 through 2016, with six distinct bulb types used across that range.
• The PC579 is the most frequently specified bulb in these records, covering the Town & Country from 2001 through 2016 (excluding 2005-2007). It is a 12V festoon bulb distinguished from the standard 579 by its printed circuit board socket, which is not interchangeable with conventional end-cap festoon holders.
• The 579 and 578 are both 12V, 12W festoon bulbs with end-cap contacts, but they differ in length. The 579 measures 44mm while the 578 measures 41mm, making them physically incompatible with each other despite their similar ratings.
• The 562 is also a 44mm festoon bulb rated at 12V and 12W, sharing the same physical length as the 579. However, the 562 and 579 are separate ANSI designations and are not confirmed as interchangeable within these specifications.
• The 912 is a T15 wedge bulb rated at 12V and 12W. It is classified as a variant of the 921, meaning some 921-compatible sockets may accept it, though fitment depends on the specific housing design.
• The 906 is a T10 miniature wedge bulb rated at 12V and 8W. Its lower wattage distinguishes it from the 912, and the two wedge types are not interchangeable due to differences in base size and power draw.
• The 1004 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21/5W output. It is listed as a variant of the 1157, though the dual-filament design is atypical for a map light application and reflects the engineering conventions of the era in which it was specified (1956-1966).
• The bulb designated 90 uses a BA15s single-contact bayonet base and is rated at 12V and 13W. The bayonet base format differs fundamentally from the wedge and festoon types used in later model years, requiring a socket specific to that base style.
• The 1895 is a T5 miniature wedge bulb rated at just 0.9W, making it the lowest-wattage bulb in these specifications by a considerable margin. It was specified for the 1971 model year only.
• Across the full specification range, the Town & Country transitions through bayonet, festoon, and wedge base formats, meaning bulbs from different eras are not cross-compatible without a corresponding socket change.