Ford Probe Dome Light Bulb Size

The Ford Probe dome light uses bulb sizes 13050, 6428, DE3021, and 912 depending on the specific version of the vehicle. Available data for the lighting components covers the range from 1990 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	13050
1995-1996	6428
1994	DE3021
1992-1993	912
1991	DE3021
1990	6428

Bulb Specifications

Description	Bulb Size
OEM/Wagner part number. Halogen bulb, specialty application. 12V.	13050
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6428
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3021
ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W.	912

Other Locations

Additional Notes

The Ford Probe dome light specifications span the 1990-1997 model years, with four distinct bulb sizes used across that range: 13050, 6428, DE3021, and 912.
The 6428 is an ANSI-standard festoon bulb with an SV8.5 base, a 36mm length, and a 12V, 5W rating. It appears in the Ford Probe for the 1990, 1995, and 1996 model years.
The DE3021 is an ANSI-standard festoon bulb operating at 12V and measuring 31mm in length. Unlike the 6428, it uses end-cap contacts rather than an SV8.5 base, making the two festoon types physically incompatible despite sharing the same general form factor.
The 912 is an ANSI-standard wedge bulb of the T15 type, rated at 12V and 12W. It is described as a variant of the 921 bulb, though the two are not confirmed as interchangeable within these specifications.
The 13050 is an OEM and Wagner part number rather than an ANSI standard designation. It is a halogen bulb rated at 12V and is classified as a specialty application type, which distinguishes it from the other three bulb sizes listed.
Festoon bulbs, such as the 6428 and DE3021, are cylindrical lamps that seat between two spring contacts at each end of a housing. The difference in length between the two, 36mm for the 6428 and 31mm for the DE3021, means each requires a housing sized to match its specific length.
The Ford Probe (1993-1992) uses the 912 wedge bulb, while the adjacent 1994 model year shifts to the DE3021 festoon type. This represents a change in both bulb format and socket type between those model years.
The 1997 Ford Probe uses the 13050 halogen bulb exclusively for the dome light, setting it apart from all other model years in the specification range, which rely on non-halogen bulb types.
Because the 6428 and DE3021 are both festoon bulbs but differ in length and base contact style, substituting one for the other would result in an improper fit within the dome light housing.
The 912 wedge bulb carries a notably higher wattage rating of 12W compared to the 6428 at 5W, reflecting a fundamental difference in power draw between the wedge and festoon formats used across this model range.