Dodge Ram 5500 Dome Light Bulb Size

Dodge Ram 5500 dome light bulb uses a 578 size bulb for interior lighting applications. The replacement chart covers vehicle production spanning 2008 to 2010 with corresponding bulb specifications.

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	578

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578

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Additional Notes

The 578 bulb is the dome light bulb size for the Dodge Ram 5500 across the 2008-2010 model years.
The 578 is a festoon-type bulb, meaning it is cylindrical in shape and mounts by pressing its end-cap contacts against spring clips at both ends of the fixture, rather than using a socket base.
The 578 bulb has a length of 41mm, which is a standard festoon size used across a wide range of automotive interior lighting applications.
It operates at 12 volts and draws 12 watts, consistent with conventional incandescent automotive interior bulbs.
The 578 follows ANSI standards recognized in both the United States and Canada, indicating a standardized specification for the bulb's electrical and physical characteristics.
Festoon bulbs of the same length are not always interchangeable, as wattage and voltage ratings must also match the vehicle's fixture requirements for proper function.