Dodge B1500 Dome Light Bulb Size

The Dodge B1500 dome light requires bulb size 579 or 906 depending on the specific configuration of the interior lighting system. Data for the bulb sizes covers the range from 1995 to 1998.

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
1998	579
1995-1996	906

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	579
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906

Other Locations

Additional Notes

The 906 bulb is a miniature wedge type in the T10 form factor, operating at 12V and drawing 8W. It uses a wedge base, meaning the glass envelope itself acts as the retaining mechanism with no separate metal base required.
The 579 bulb is a festoon type, 44mm in length, with end-cap contacts at both ends. It operates at 12V and draws 12W. Festoon bulbs seat by pressing lengthwise between two spring clips inside the fixture.
Both the 579 and 906 are ANSI-rated standards recognized in the United States and Canada, indicating conformance to a defined set of electrical and physical tolerances.
The Dodge B1500 uses the 906 bulb for the dome light across the 1995-1996 model years, while the 1998 model year uses the 579 bulb instead.
The 579 and 906 are not interchangeable. The 579 is a festoon bulb held by end-cap contacts, whereas the 906 uses a wedge base socket. The mounting mechanisms are physically incompatible.
The wattage difference between the two bulbs is notable. The 579 draws 12W compared to the 906 at 8W, meaning the 1998 fixture is designed to handle a higher wattage load than those used in 1995-1996.