Ford F-150 Engine Compartment Light Bulb Size

The Ford F-150 engine compartment light uses bulb sizes 912, 90, and 105 depending on the specific version of the vehicle. Available information covers a range from 1975 through 1998 for the components listed in the provided data.

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
1992-1998	912
1988-1991	90
1985-1986	90
1975-1979	105

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W.	912
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 13W.	90
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	105

Other Locations

Additional Notes

The Ford F-150 engine compartment light bulb specifications cover model years 1975-1998, with three distinct bulb types used across that span: the 912, the 90, and the 105.
The 912 bulb is a T15 wedge-type unit rated at 12V and 12W, conforming to ANSI standards for the US and Canadian markets. It is classified as a variant of the 921 bulb.
The 912 is the bulb specified for the Ford F-150 engine compartment light across the 1992-1998 model years.
The 90 bulb uses a BA15s bayonet base and is a single-filament type rated at 12V and 13W, also meeting ANSI standards for the US and Canadian markets.
A BA15s bayonet base features a single contact pin, which is what distinguishes it from dual-contact bayonet variants and makes it non-interchangeable with those types.
The 90 bulb is specified for the F-150 engine compartment light across the 1985-1991 model years, with the exception of 1987, for which no specification is listed.
The 105 bulb shares the same BA15s bayonet base and 12V, 13W rating as the 90 bulb, but it is classified as a variant of the 1156 rather than being identical to the 90.
Although the 90 and 105 bulbs share the same base type and electrical ratings, their classification as separate ANSI types indicates they are not confirmed as interchangeable.
The 105 bulb is specified for the F-150 engine compartment light across the 1975-1979 model years.
The shift from the 105 to the 90 bulb, and later from the 90 to the 912 wedge-type bulb, reflects changes in the base design used for this application across different generations of the F-150.