Ram ProMaster Daytime Running Light Bulb Size

Additional Notes

• The Ram ProMaster uses the 7440 bulb for the daytime running light position across the 2014-2024 model years.
• The 7440 is a T20 wedge-base bulb, meaning it uses a plastic wedge at its base rather than a metal pin or bayonet fitting to secure itself in the socket.
• The 7440 operates at 12 volts and draws 21 watts, which is consistent with standard automotive electrical systems.
• The 7440 is a single-filament bulb, meaning it produces only one light output level and is not capable of serving dual functions such as combined stop and tail lighting from a single unit.
• The 7440 conforms to ANSI standards, indicating it meets a defined specification recognized across the United States and Canada for consistent physical and electrical characteristics.
• The T20 bulb family includes both single-filament and dual-filament variants. The 7440 is the single-filament type, while the 7443 is the dual-filament equivalent. These two types share the same T20 wedge base form, but the 7443 has an offset pin arrangement that physically prevents it from seating in a socket designed for the 7440, making the two non-interchangeable.