The Pontiac Grand LeMans front and rear side marker bulbs both utilize a 194 bulb size. The replacement chart covers 1975 through 1981 production years 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 LeMans uses the 194 bulb for both front and rear side marker positions across the 1975-1981 model years.
The 194 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American industry standard applicable in both the United States and Canada.
This bulb follows the T10 miniature wedge form factor, which uses a tapering plastic base that presses directly into a socket without requiring a separate metal base or locking pins.
The 194 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this era.
At 3.78 watts, the 194 draws relatively low power, which is typical for side marker applications where continuous illumination is required without significant electrical load.
Because the same bulb size applies to both the front and rear side marker positions, a single bulb type services all four side marker sockets on the Grand LeMans.
The T10 wedge base format is a widely produced size, and the 194 designation specifically identifies a particular wattage and voltage rating within that base family, meaning not all T10 wedge bulbs are interchangeable with the 194 despite sharing the same physical base type.