GMC C2500 Suburban Courtesy Bulb Size

The GMC C2500 Suburban courtesy bulb utilizes 3 distinct sizes: 168, 561, and 194, with each bulb size corresponding to specific applications within the vehicle's interior lighting system. The replacement chart documents courtesy bulb specifications across the 1979 to 1999 production range for this model.

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

YearsBulb Size
1999168
1998561
1996-1997194
1995168
1993-19941003
1992168
1985-1986168
19841003
19831004
1980161
19791156

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.168
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.561
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.194
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.1003
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.1004
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 1W.161
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.1156

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