GMC Sierra High Beam Indicator Bulb Size

GMC Sierra high beam indicator bulb uses a 74 size for this component across the specified production range. The replacement chart covers 1999 to 2002 model years with corresponding bulb size data.

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
1999-2002	74

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74

Other Locations

Additional Notes

The GMC Sierra uses the 74 bulb for the high beam indicator across the 1999-2002 model years.
The 74 bulb follows the ANSI standard, which is the recognized classification system for miniature bulbs in the United States and Canada.
It is a T5 miniature wedge type, meaning it uses a wedge-shaped base rather than a screw or bayonet fitting, and the bulb body is 5/8 of an inch wide.
The 74 bulb operates at 12 volts, which is consistent with standard automotive electrical systems.
At 1.4 watts, the 74 bulb draws very low power, which is typical for dashboard indicator lamps rather than exterior lighting.
The wedge base design of the 74 bulb means it is held in place by tension from the socket itself, with no separate metal base or locking mechanism required.