Dodge Ram 5500 Back Up Light Bulb Size

The Dodge Ram 5500 back up light utilizes 1156 and P21W bulb sizes according to the provided data. Information for the specified component covers the period from 2008 through 2010.

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 specified back up light bulb size for the Dodge Ram 5500 across the 2008-2010 model years.
The 1156 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard shared across the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is consistent with standard automotive reverse lighting applications.
The 1156 uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, as opposed to the dual-pin BA15d variant. These two base types are not interchangeable despite their similar appearance.
The 1156 is a single-filament bulb, meaning it serves only one lighting function. This distinguishes it from dual-filament types such as the 1157, which handles two functions within one housing.