Pontiac Grand Prix License Plate Bulb Size

Additional Notes

• The Pontiac Grand Prix uses the 194 bulb for the license plate position across the 1973-2004 model years, making it by far the most frequently specified bulb type in these specifications.
• The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W. Its wedge base design means it is held in place by tension from the socket rather than by a locking bayonet mechanism.
• The 97, 67, and 1155 bulbs all share the BA15s single-contact bayonet base, meaning they are physically interchangeable at the socket level. However, their wattage ratings differ significantly, which affects whether one can substitute for another.
• The 97 bulb is rated at 12V and 13W, while the 67 is rated at 12V and 8W. Both are described as variants of the 1156, but the wattage difference means they are not electrically equivalent despite sharing the same base type.
• The 1155 bulb, specified for the 1964 Grand Prix, carries the highest wattage among the bayonet-base bulbs in these specifications at 12V and 21W. Substituting a lower-wattage bayonet bulb in its place would result in reduced output.
• The 1965-1971 Grand Prix models use either the 67 or 97 bulb. Although both fit the same BA15s socket, using a 97 in a position specified for a 67 would draw more current than the circuit was originally designed to handle.
• All four bulb types listed are ANSI standards applicable to both the United States and Canada, indicating they conform to a shared North American specification rather than a manufacturer-specific part.
• The T10 wedge format of the 194 is not compatible with the BA15s bayonet sockets used by the 67, 97, and 1155 bulbs. The two base types require different socket housings and are not interchangeable.