Dodge Ram 50 Dome Light Bulb Size

The Dodge Ram 50 dome light requires a DE3175 bulb size for proper installation within the interior overhead housing. Data for the specific component covers the range from 1987 to 1991.

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
1987-1991	DE3175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175

Other Locations

Additional Notes

The Dodge Ram 50 uses the DE3175 bulb for the dome light across the 1987-1991 model years.
The DE3175 is a festoon-type bulb, meaning it is cylindrical in shape and seats by pressing between two spring-clip contacts at each end rather than using a bayonet or wedge base.
The 31mm length of the DE3175 refers to the overall span of the bulb between its two end-cap contacts, which is the critical fitment factor for festoon bulbs in their holders.
The DE3175 operates at 12 volts, which is consistent with standard automotive electrical systems.
The DE designation in the bulb code indicates it conforms to ANSI standards recognized in both the United States and Canada, reflecting a standardized specification rather than a proprietary one.
Because festoon bulbs rely on contact length for fitment, substituting a festoon bulb of a different length, such as a 28mm or 36mm unit, would result in an improper fit in the Dodge Ram 50 dome light socket.
The DE3175 shares its 31mm festoon form factor with other bulbs in the DE31 family, and certain cross-compatible variants may carry different suffixes, though fitment should be confirmed against the 31mm contact-to-contact specification.