Chevrolet Corsica High Beam Indicator Bulb Size

The Chevrolet Corsica high beam indicator utilizes bulb sizes 74, PC37, and PC74 across the various production versions of the instrument cluster. Available data for the specified lighting components covers the period from 1987 through 1996.

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

Years	Bulb Size
1994-1996	PC74
1992-1993	PC37
1991	PC74
1987-1990	74

Bulb Specifications

Description	Bulb Size
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 (T5) with printed circuit board twist-lock socket, for instrument clusters. 12V.	PC37
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74

Other Locations

Additional Notes

The Chevrolet Corsica high beam indicator uses three distinct bulb types across its production run: the PC74, PC37, and 74, all of which conform to ANSI standards applicable in the United States and Canada.
All three bulb types share the T5 miniature wedge form factor, which is a small tubular bulb with a wedge-shaped base that seats directly into a matching socket without a separate holder or bayonet mechanism.
The PC74 and PC37 types both use a printed circuit board twist-lock socket, a mounting interface designed specifically for instrument cluster panels where space is constrained and direct board integration is required. The 74 type uses a standard wedge socket without this twist-lock mechanism.
The PC74 and 74 are both rated at 12V and 1.4W, making them electrically equivalent despite their different socket types. This shared wattage reflects a low-power draw appropriate for a dashboard indicator function.
The PC37 carries a 12V rating but no wattage value is specified in the available data, which distinguishes it from the PC74 and 74 in terms of documented electrical characteristics.
The Chevrolet Corsica (1987-1990) used the 74 bulb, while the 1991 model year transitioned to the PC74, indicating a socket type change between those years despite the identical wattage rating.
The 1992-1993 model years used the PC37, representing a departure from the PC74 used in 1991, before the PC74 was reinstated for the 1994-1996 model years.
Because the PC74 and 74 share electrical ratings but differ in socket type, they are not directly interchangeable without a corresponding socket adapter or cluster modification.