Dodge Grand Caravan Map Light Bulb Size

Additional Notes

• The Dodge Grand Caravan map light uses the PC579 bulb across the 2005-2019 model years, making it the most frequently specified bulb type in these specifications.
• The PC579 is a festoon-style bulb operating at 12V, distinguished from standard festoon types by its printed circuit board socket, which is not interchangeable with conventional end-cap festoon sockets.
• The 578 bulb is specified for the 2000-2004 model years, as well as 1996-1998. It is also a 12V festoon type, rated at 12W, with a 41mm length and end-cap contacts.
• Although the PC579 and 578 are both festoon bulbs operating at 12V, their socket designs differ. The PC579 requires a printed circuit board socket, while the 578 uses standard end-cap contacts, making the two types non-interchangeable.
• The 1999 model year is specified with the PC579, while the surrounding years from 1996-1998 and 2000-2004 use the 578, indicating a socket type change occurred across those production years.
• The 906 bulb is specified for the 1993-1995 model years. It is a T10 miniature wedge bulb rated at 12V and 8W, a physically distinct form factor from the festoon types used in later years.
• The 168 bulb appears in the 1990 and 1992 model years. Like the 906, it is a T10 miniature wedge type, though it draws considerably less power at 4.9W versus the 906's 8W.
• The 912 bulb is specified for the 1987-1989 and 1991 model years. It is a T15 wedge bulb rated at 12V and 12W, and is noted as a variant of the 921 bulb type.
• The T15 wedge base of the 912 is physically larger than the T10 wedge base shared by the 906 and 168, meaning these wedge types are not interchangeable despite sharing the same 12V operating voltage.
• Across the full range of these specifications, the Dodge Grand Caravan map light position has used four distinct bulb form factors: the PC579 festoon with PCB socket, the 578 festoon with end-cap contacts, the T10 miniature wedge, and the T15 wedge.