GMC P4500 High Beam Indicator Bulb Size

The GMC P4500 high beam indicator utilizes bulb sizes 1445, 194, and 168 for the instrument panel lighting system. Available data for the specified components covers the span from 1979 to 1988.

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
19881445
1985-19871445
194 (Medium Duty)
1980-19841445
19791445
168 (Medium Duty)

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.1445
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.194
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.168

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