GMC K2500 Map Light Bulb Size

Additional Notes

• The GMC K2500 map light specifications reference two distinct bulb types across the 1993-2000 model years: the 168 and the 211-2.
• Both the 168 and 211-2 are ANSI-standardized bulbs recognized in the United States and Canada, meaning they conform to defined electrical and physical standards rather than being proprietary parts.
• The 168 is a T10 miniature wedge bulb rated at 12V and 4.9W. The wedge base design means the bulb is held in place by the socket gripping its glass envelope directly, with no separate metal base pins.
• The 211-2 is a festoon-style bulb with an SV8.5 base and a 41mm length, rated at 12V and 12W. Festoon bulbs are cylindrical and mount by pressing their end caps into spring-loaded contacts within the housing.
• The 211-2 draws 12W compared to the 168's 4.9W, meaning the two bulbs are not electrically equivalent and are not interchangeable despite both operating on a 12V system.
• The physical form factors of the 168 and 211-2 are also incompatible. A wedge-base socket and a festoon-style socket are mechanically different, so substitution between the two types is not possible without a socket change.
• The GMC K2500 used the 211-2 festoon bulb for the map light across the 1994-1997 model years, as well as in 1995 and 1999, making it the more frequently specified of the two bulb types in this application.
• The 168 wedge bulb was specified for the GMC K2500 map light in the 1993, 1998, and 2000 model years.
• The alternation between bulb types across model years indicates that the map light housing or socket configuration was not consistent throughout the K2500's production run, and the correct bulb type is therefore year-specific.
• Because the 1999 K2500 uses the 211-2 and the 2000 model uses the 168, consecutive model years in this range do not share the same map light bulb specification.