Ford Aspire Trunk Bulb Size

The Ford Aspire trunk light requires bulb size DE3021 or 6428 depending on the specific version of the vehicle. Data for the lighting components covers the range from 1994 to 1997.

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
1997	DE3021
1994-1996	6428

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3021
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6428

Other Locations

Additional Notes

The Ford Aspire uses two distinct festoon bulb types across its 1994-1997 model years for the trunk: the DE3021 and the 6428.
A festoon bulb is a cylindrical lamp that mounts horizontally between two end contacts or a base socket, commonly used in enclosed interior and trunk lighting applications.
The 6428 bulb is specified for the 1994-1996 Ford Aspire trunk, making it the more widely applied of the two types across this model's production span.
The 1997 Ford Aspire trunk requires the DE3021 bulb, which differs from the 6428 used in prior years and is not a direct substitute for it.
Both the DE3021 and the 6428 conform to ANSI standards applicable in the United States and Canada, indicating standardized electrical and physical tolerances for each type.
The DE3021 is a 31mm festoon bulb with end-cap contacts and operates at 12 volts, while the 6428 is a 36mm festoon bulb with an SV8.5 base, also rated at 12 volts and 5 watts.
The 5mm difference in length between the DE3021 and the 6428 means the two bulbs are physically incompatible with each other's housings, and substitution between the two types is not supported by these specifications.
The SV8.5 base designation on the 6428 refers to a festoon base with an 8.5mm contact width, a detail relevant to socket fitment in the 1994-1996 trunk housing.
The DE3021 uses end-cap contacts rather than a named base designation, reflecting a different mounting interface than the SV8.5 socket required by the 6428.