The Dodge Ram 4500 brake light requires a 1157 bulb size for proper installation and function within the rear lighting assembly. Data for 1157 bulbs covers the range from 2008 to 2010.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge Ram 4500 uses the 1157 bulb for brake lights across the 2008-2010 model years.
The 1157 is a dual-filament bulb, meaning it serves two lighting functions within a single unit, typically combining stop and tail light operation through separate filaments rated at 21W and 5W respectively.
The 1157 uses a BAY15d bayonet base, a two-pin offset base design that prevents incorrect installation by ensuring only one rotational orientation fits the socket.
The center high mount stop light on the Dodge Ram 4500 uses the 912 bulb for the 2008-2010 model years.
The 912 is a single-filament wedge-type bulb in the T15 form factor, operating at 12V with a 12W output.
The 912 is a variant of the 921 bulb, and while the two are closely related, they are not always interchangeable due to wattage differences; the 921 is rated at 16.8W, which exceeds the 912's 12W rating.
Both the 1157 and 912 conform to ANSI standards applicable in the United States and Canada.
The BAY15d base of the 1157 is distinct from the wedge base of the 912, meaning the two bulb types are not interchangeable with each other regardless of application.