Jeep CJ3 Dome Light Bulb Size

Additional Notes

• The Jeep CJ3 uses the 212-2 bulb for the dome light across all listed model years, spanning 1959-1966.
• The 212-2 is an ANSI-standardized bulb, meaning it conforms to a defined specification recognized across the United States and Canada.
• This bulb follows a festoon design, which means it is cylindrical in shape and mounts by pressing horizontally between two spring-loaded contacts at each end, rather than inserting into a socket.
• The 212-2 has a length of 41mm, which is a critical fitment factor, as festoon bulbs must physically span the contact points of the fixture to seat correctly.
• It uses an SV8.5 base, a designation that refers to the 8.5mm width of the end caps on a festoon-style bulb.
• The 212-2 operates at 12 volts, consistent with the standard 12-volt electrical systems found in automotive applications of that era.
• At 12 watts, the 212-2 draws a moderate amount of current for an interior dome application, and any replacement bulb should match this wattage to avoid overloading the fixture or wiring.
• Because the Jeep CJ3 dome light specification is uniform across 1959-1966, a single bulb type serves the entire production run covered in these specifications, with no variation by year.