Isuzu Trooper Dome Light Bulb Size

The Isuzu Trooper dome light utilizes a DE3175 bulb size for interior illumination within the cabin area. Provided information covers a specific time span ranging from 1994 through 2002.

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
1994-2002	DE3175

Bulb Specifications

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

Other Locations

Additional Notes

The Isuzu Trooper uses the DE3175 bulb size for the dome light across all listed model years, spanning 1994-2002.
The DE3175 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
Festoon bulbs are held in place by spring-loaded clips that press against the end caps, a mounting method common in interior dome light housings.
The DE3175 has a nominal length of 31mm, which is a physical fitment specification that determines whether the bulb seats correctly within the spring clip holder.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles and light trucks.
The DE3175 designation follows ANSI standards, indicating the bulb conforms to specifications recognized across the United States and Canada.
Because the DE3175 is an ANSI-standardized part, it is produced by multiple manufacturers, and units from different brands are generally interchangeable provided the 31mm length and end-cap contact design are maintained.
Substituting a festoon bulb of a different length, such as a 36mm or 41mm unit, would result in improper fitment within the Trooper's dome light housing due to the fixed spacing of the spring clips.