GMC G2500 Map Light Bulb Size

The GMC G2500 map light requires a 906 bulb size for proper installation and function within the interior lighting system. Available data covers the specific time range from 1985 through 1995.

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
1992-1995	906
1985-1987	906

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906

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Additional Notes

The GMC G2500 uses the 906 bulb size across all specified model years for the map light position.
The years covered by these specifications are 1985-1987 and 1992-1995.
The 906 is an ANSI-standardized bulb, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
It belongs to the T10 miniature wedge bulb family, a form factor that uses a wedge-shaped base rather than a metal contact pin, allowing it to be held in place by the socket itself.
The 906 operates at 12 volts, which is consistent with standard automotive electrical systems.
Its rated wattage is 8W, placing it in the low-power range typical of interior courtesy and reading light applications.
The wedge base design of the T10 means fitment depends on socket compatibility with that specific base type, and substitutions using different base styles would not be physically interchangeable.