GMC K2500 Suburban Courtesy Bulb Size

The GMC K2500 Suburban courtesy bulb utilizes 3 distinct sizes: 561, 74, and 1003 bulb configurations. The replacement chart documents vehicle production data spanning from 1979 through 1999.

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
1999561
199874
19971003
1996194
1994-1995168
1993194
1992168
1985-1986168
19841004
19831003
1979-19801156

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.561
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.74
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.1003
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). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.1004
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.1156

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