Jeep Wrangler Map Light Bulb Size

The Jeep Wrangler map light utilizes bulb sizes 578 and 212-2 for the interior lighting components. Available data covers the period from 1989 through 2018 for the specified vehicle.

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
2010-2018	578
1995	212-2
1989-1993	212-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2

Other Locations

Additional Notes

The Jeep Wrangler map light specifications list two bulb types across the model's history: the 578 and the 212-2.
Both the 578 and 212-2 are ANSI-standardized festoon bulbs rated at 12V and 12W, making them identical in voltage, wattage, and physical length at 41mm.
Despite sharing the same voltage, wattage, and length, the 578 and 212-2 differ in their contact design. The 578 uses end-cap contacts, while the 212-2 uses an SV8.5 base, which means the two types are not interchangeable.
The Jeep Wrangler (2010-2018) takes the 578 bulb for the map light position.
The 578 is the more recent of the two bulb types represented in these specifications, covering a nine-year span of Wrangler production.
The Jeep Wrangler (1989-1995) takes the 212-2 bulb for the map light position.
The SV8.5 base designation on the 212-2 refers to a festoon-style base with a specific cap size, a format common in older automotive interior lighting applications.
End-cap contacts on the 578 make contact at both ends of the bulb along its central axis, a design that relies on spring tension within the fixture rather than a keyed base socket.