The Pontiac Grand Am uses 194NA and 194 bulb sizes for front side marker applications, while rear side marker positions accommodate 3157, 194, and 24 bulb sizes. The replacement chart covers vehicle production spanning 1973 to 2005 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac Grand Am uses three distinct bulb types across its front and rear side marker positions: the 194NA, 194, and 3157 for the front and rear side markers, and the 24 for select rear side marker years.
The 194NA is a T10 miniature wedge bulb rated at 12V and 3.78W, distinguished from the standard 194 by its natural amber glass envelope, which produces an amber output without the need for an amber-tinted housing or lens.
The 194 shares the same T10 miniature wedge form factor, voltage, and wattage as the 194NA at 12V and 3.78W, but its glass is clear rather than amber-tinted.
The Pontiac Grand Am (front side marker) specifies the 194NA for model years 1991-1996 and 1999-2005, while the standard 194 is specified for 1973-1990 and 1997, indicating that the amber glass variant became the predominant front fitment from the early 1990s onward.
The 194 and 194NA are not interchangeable in applications where the housing relies on the bulb itself to produce the required amber color. Installing a clear 194 in a position specified for the 194NA may result in non-compliant marker light color output.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and a 7W low filament, making it a significantly higher-wattage component than the 194-series bulbs used elsewhere in the side marker system.
The rear side marker of the Grand Am transitions to the 3157 for model years 1999-2005, a notable departure from the 194-series bulbs used in prior years, reflecting a change in the rear lamp assembly design for that generation.
The bulb designated 24 uses a BA9s bayonet base rather than a wedge base, making it physically incompatible with sockets designed for T10 or T25 wedge-type bulbs. It is rated at 12V and 2W, the lowest wattage of any bulb in these specifications.
The 24 bulb is specified for the Grand Am rear side marker only in 1992-1993, with the surrounding model years using the 194 instead, meaning the socket type in those two years differs from the majority of the rear side marker fitment history.
All four bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada.