Jeep Patriot Map Light Bulb Size

Additional Notes

• The Jeep Patriot uses the 578 bulb size for the map light across all model years covered in the specifications, spanning 2007-2017.
• The 578 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are defined by a recognized North American standards body and are consistent across manufacturers.
• The 578 bulb follows a festoon design, which means it is cylindrical in shape and mounts by pressing horizontally between two spring-clip contacts rather than inserting into a socket.
• The festoon body of the 578 measures 41mm in length, which is the critical fitment factor when considering a replacement, as festoon bulbs of differing lengths are not interchangeable even if voltage and wattage ratings match.
• The 578 bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
• The bulb carries a 12-watt rating, which reflects its power draw from the vehicle's electrical system during operation.
• The end-cap contact design of the 578 means electrical connection is made through metal caps at each end of the bulb body, a construction typical of festoon-type bulbs used in interior lighting applications.
• Because the 578 is an ANSI-defined standard, it is produced by multiple bulb manufacturers under the same designation, and units from different brands sharing the 578 number are generally considered direct replacements for the Jeep Patriot map light position.