GMC K2500 Side Marker Bulb Size

The GMC K2500 side marker requires a 194 bulb size for proper illumination of the exterior lighting housing. Available data for the specified component covers the range from 1995 through 2000.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Side Marker

YearsBulb Size
1992-2000194
1990-1991194 (With Halogen Capsule Headlamps)
1988-1989194
1979-1986168

Rear Side Marker

YearsBulb Size
1993-2000194
1980194
197967

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.194
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.168
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.67

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