Chevrolet Blazer Parking Brake Indicator Bulb Size

Additional Notes

• The Chevrolet Blazer parking brake indicator uses three distinct bulb types across its model years: the PC74, the 194, and the 168, all of which conform to ANSI standards applicable in the United States and Canada.
• The PC74 is a T5 miniature wedge bulb rated at 12V and 1.4W. It is designed for use with a printed circuit board twist-lock socket, making it specific to instrument cluster applications rather than general lighting sockets.
• The Chevrolet Blazer uses the PC74 for its parking brake indicator across the 1995-2003 model years, representing the longest continuous application of a single bulb type in these specifications.
• The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W. The Blazer uses this bulb for the parking brake indicator in the 1989-1991 and 1993-1994 model years.
• The 168 bulb is also a T10 miniature wedge bulb but is rated at a higher 4.9W output compared to the 194. The Blazer uses the 168 for the 1987-1988 model years.
• Although the 194 and 168 share the same T10 wedge form factor and 12V operating voltage, their wattage ratings differ, and they are not listed interchangeably within these specifications.
• The twist-lock socket required by the PC74 is physically distinct from the standard wedge socket used by the 194 and 168, meaning these bulb types are not cross-compatible with one another.
• The shift from the 168 to the 194 and later to the PC74 reflects progressively lower wattage ratings for the parking brake indicator position across the Blazer's production span covered by these specifications.