Jeep Gladiator Dome Light Bulb Size

Additional Notes

• The 912 bulb is the most frequently specified dome light bulb across the Jeep Gladiator model years listed, appearing in six of the nine model years covered by the specifications.
• The 912 is a T15 wedge-type bulb rated at 12 volts and 12 watts, conforming to ANSI standards recognized in both the United States and Canada.
• As a variant of the 921 bulb, the 912 shares the same wedge base form factor, though the two are not identical and substitution between them warrants verification before use.
• The 212-2 is a festoon-type bulb with an SV8.5 base, also rated at 12 volts and 12 watts, and likewise meets ANSI standards for the US and Canadian markets.
• Festoon bulbs such as the 212-2 are held in place by spring-loaded end caps rather than a socket, which is a physically distinct mounting method from the wedge base used by the 912.
• The 212-2 has a 41mm length, a specification that is critical for fitment since festoon bulbs must match the physical span of the housing to seat correctly.
• The Jeep Gladiator (1965-1967) uses the 212-2 festoon bulb, while the surrounding model years use the 912 wedge bulb, indicating a change in dome light housing design across those production periods.
• Despite sharing the same voltage and wattage ratings, the 912 and 212-2 are not interchangeable due to their fundamentally different base types and mounting configurations.