Chevrolet Blazer Instrument Panel Bulb Size

Additional Notes

• The T10 wedge base is the most prevalent bulb format across the Chevrolet Blazer instrument panel specifications, covering the majority of model years from 1971 through 2003. This base type accepts a wedge-shaped glass envelope that locks directly into a matching socket without a separate metal base, making it a widely standardized format in automotive instrument cluster applications.
• The PC-prefix bulb designations, specifically PC168, PC175, and PC194, are T10 wedge bulbs adapted for printed circuit board instrument clusters. Their twist-lock sockets are designed to mount directly onto a flat printed circuit board rather than into a conventional wired socket holder, which makes them physically incompatible with earlier socket types despite sharing the T10 envelope form.
• The 1997 Blazer uses the 161 bulb, a T10 wedge type rated at 12V and 1W. At 1W, it operates at a notably lower wattage than other T10 variants in these specifications, such as the 168 at 4.9W or the 194 and PC194 at 3.78W, which reflects a difference in intended brightness output.
• The 168 and 194 bulbs share the T10 wedge base and 12V operating voltage but differ in wattage, with the 168 rated at 4.9W and the 194 at 3.78W. Both are ANSI-standardized for the US and Canadian markets. Although they share a physically compatible base, wattage differences mean they are not electrically interchangeable without affecting illumination levels.
• The 1970 Blazer uses the 1816 bulb, a T3.25 miniature wedge type rated at 12V and 4W. The T3.25 designation indicates a narrower envelope than the T10 used in later years, and this bulb is not interchangeable with T10-based types due to the difference in physical size and socket fitment.
• The 1969 Blazer uses the 1445 bulb, which is the only specification in this set that does not use a wedge base. The 1445 is a single-filament bulb with a BA9s bayonet cap base, rated at 12V and 2W. The BA9s base requires a round socket with two retaining pins, which is mechanically distinct from all wedge-type sockets used across the remaining model years.
• The PC194 is the only PC-prefix bulb in these specifications with a stated wattage of 3.78W, matching the non-PC 194 bulb. The PC168 and PC175 do not have wattage values listed in the provided descriptions, though all three PC-prefix types share the T10 envelope and twist-lock printed circuit board socket.
• The 2002-2003 Blazer and the 1996 Blazer both specify the PC168, while the 2000-2001 and 1995 model years specify the PC175. These PC-prefix bulbs require printed circuit board sockets and are not compatible with the conventional wired sockets associated with the non-PC 168 and 175 bulb types used in earlier years.