GMC W6500 Forward Parking Brake Indicator Bulb Size

The GMC W6500 Forward parking brake indicator uses bulb sizes 158, 168, and PC74 according to the provided specifications for the vehicle lighting system. Data for the specific components covers the range from 1987 through 1996 for the listed automotive application.

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
1995-1996158 (Tiltmaster)
1994PC74 (Tiltmaster)
1993158 (Tiltmaster)
1992PC74 (Tiltmaster)
1989-1991158 (Tiltmaster)
1988158 (Tiltmaster)
168 (With 2 Round Headlamps)
1987158
168 (With 2 Round Headlamps)

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3W.158
ANSI standard (US & Canada). Miniature wedge bulb (T5) with printed circuit board twist-lock socket, for instrument clusters. 12V, 1.4W.PC74
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.168

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