Mitsubishi Montero Dome Light Bulb Size

Additional Notes

• The Mitsubishi Montero uses the DE3175 bulb size for the dome light across all listed model years, spanning 1995-2006, with the exception of 2000, which is not present in the specifications.
• The DE3175 is an ANSI-standardized bulb type, meaning its physical and electrical characteristics conform to a defined North American standard recognized in both the United States and Canada.
• The DE3175 belongs to the festoon bulb family, a cylindrical form factor in which the bulb bridges two end-cap contacts rather than using a screw or bayonet base.
• The festoon construction of the DE3175 means the bulb is held in place by spring-tension clips at each end of the housing, a common mounting method in interior dome light fixtures.
• The DE3175 has a nominal length of 31mm, which is the measurement between its two end contacts and determines physical fitment within the dome light socket.
• The bulb operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles and light trucks.
• Because the DE3175 is an ANSI-designated part, it is interchangeable with other bulbs carrying the same designation regardless of manufacturer, provided the 31mm festoon form factor and 12V rating are matched.
• Substituting a festoon bulb of a different length, such as the 36mm DE3423 or the 28mm DE3022, would result in an improper fit within the Montero dome light housing due to the fixed spacing of the end-cap contacts.