Jeep Wrangler Dome Light Bulb Size

Additional Notes

• The Jeep Wrangler dome light draws from three distinct bulb types across its model years: the 912 wedge bulb, and the 578 and 211-2 festoon bulbs.
• The 912 is a T15 wedge-base bulb rated at 12V and 12W. It is a variant of the 921 bulb and follows the ANSI standard applicable in the US and Canada.
• The 578 is a festoon-style bulb rated at 12V and 12W, with a 41mm length and end-cap contacts. It also conforms to the ANSI standard for the US and Canadian markets.
• The 211-2 is a festoon bulb rated at 12V and 12W, with a 41mm length and an SV8.5 base. Despite sharing the same voltage, wattage, and physical length as the 578, its SV8.5 base differs from the end-cap contact design of the 578, making the two non-interchangeable.
• The 212-2 shares the same 12V, 12W rating, 41mm length, and SV8.5 base as the 211-2. The two bulbs are closely related within the festoon family.
• The Jeep Wrangler uses the 912 bulb for model years 2010-2020, representing the longest continuous fitment span in the specifications.
• Model years 2007-2009 use the 578 festoon bulb, which differs in base type from the 211-2 used in the 2003-2006 model years, making cross-substitution between those groups incompatible without socket modification.
• The 912 wedge base and the festoon-style 578 and 211-2 bulbs are physically incompatible with one another, as wedge bases and festoon sockets are fundamentally different mounting systems.
• Model years 2000-2002 use the 912 bulb, the same type specified for 2010-2020, though the intervening years from 2003-2009 use different bulb types entirely.
• The 1995 Wrangler uses the 212-2, while the 2003-2006 models use the 211-2. Both share the same physical and electrical specifications, though they carry distinct ANSI designations.