Dodge Nitro Map Light Bulb Size

The Dodge Nitro map light requires a bulb size of 578 for the interior lighting system. Data for the specified component covers the range from 2007 through 2011.

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
2007-2011	578

Bulb Specifications

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

Other Locations

Additional Notes

The Dodge Nitro uses the 578 bulb size for the map light across its 2007-2011 model years.
The 578 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the US and Canada.
The 578 is a festoon-style bulb, a cylindrical form factor that seats between two spring-loaded clips or end-cap contacts rather than fitting into a socket with a base pin.
The 578 bulb has a length of 41mm, which is the critical fitment factor for festoon bulbs, as the housing span must match the bulb length for proper contact and retention.
End-cap contacts on the 578 mean electrical connection is made at both flat ends of the bulb, which is characteristic of the festoon type and distinguishes it from wedge or bayonet base bulbs.
The 578 operates at 12 volts, consistent with standard automotive electrical systems.
The 578 is rated at 12 watts, placing it in a moderate output range for an interior courtesy or map light application.
Because festoon bulbs are sized by length, substituting a festoon bulb of a different millimeter length, even at the same voltage and wattage, would result in an improper fit in the Dodge Nitro map light housing.