Ram ProMaster Brake Bulb Size

Additional Notes

• The 7443 bulb is the most frequently specified brake bulb across Ram ProMaster model years, covering 2014-2022.
• The 7443 is a dual-filament wedge bulb following the T20 form factor, rated at 12V with a 21W high filament and a 5W low filament, conforming to ANSI standards for the US and Canadian markets.
• Its dual-filament design allows a single bulb to serve two lighting functions simultaneously, typically combining brake and tail light operation within one housing.
• The 2024 Ram ProMaster uses the 7440 bulb, which shares the T20 wedge form factor and 12V/21W rating with the 7443 but carries only a single filament.
• Because the 7440 and 7443 share the T20 form factor and physical base, they are physically interchangeable in the socket, though substituting one for the other affects the number of available filaments and may result in lost lighting functionality.
• The 2023 model year uses the 921 bulb, a T15 wedge type rated at 12V and 16W, which is a physically smaller and lower-wattage single-filament bulb compared to the T20 types used in surrounding model years.
• The T15 base of the 921 is not compatible with T20 sockets, making the 921 non-interchangeable with either the 7440 or the 7443 without a socket adapter.
• All three bulb types specified across the ProMaster lineup conform to ANSI standards applicable to the US and Canadian markets.