Dodge Ram 4500 Back Up Light Bulb Size

Dodge Ram 4500 back up light bulb uses a 1156 size bulb for the specified vehicle production range. The replacement chart covers 2008 to 2010 model years with corresponding bulb size data.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2008-2010	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

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Additional Notes

The 1156 is the back up light bulb size for the Dodge Ram 4500 across the 2008-2010 model years.
The 1156 bulb follows the ANSI standard, which governs its electrical and physical characteristics for the US and Canadian markets.
It is a single-filament bulb, meaning it serves one lighting function rather than sharing a housing with a second filament for an additional function such as braking or running lights.
The 1156 operates at 12 volts and 21 watts, which is consistent with standard automotive electrical systems.
It uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place.
The BA15s designation indicates a single-contact base with a 15mm collar, distinguishing it from the dual-contact BA15d base used in two-filament bulbs of similar physical size.
Because the 1156 and the visually similar 1157 share the same bayonet collar width, the 1157 does not serve as a direct replacement, as its dual-contact base is electrically and physically incompatible with a single-contact socket.