Ford F-150 Roof Marker Bulb Size

The Ford F-150 roof marker utilizes 168 and 97 bulb sizes for the lighting components. Data for the specific bulb sizes covers the range from 1975 to 1979.

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
1978-1979	168
1975-1977	97

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	97

Other Locations

Additional Notes

The Ford F-150 roof marker uses two distinct bulb types across the 1975-1979 model years: the 168 and the 97.
The 168 bulb is a T10 miniature wedge type rated at 12V and 4.9W, conforming to ANSI standards for the US and Canadian markets.
The T10 wedge base on the 168 bulb connects by friction fit rather than a locking mechanism, which is a common trait of low-wattage marker and courtesy light applications.
The 97 bulb uses a BA15s single-contact bayonet base and is rated at 12V and 13W, also under ANSI standards for the US and Canadian markets.
At 13W, the 97 draws notably more power than the 4.9W 168, reflecting a different design intent despite both serving the roof marker position.
The 97 is described as a variant of the 1156, meaning it shares the BA15s bayonet base but differs in wattage and physical size from the standard 1156 specification.
The Ford F-150 (1978-1979) uses the 168 bulb for the roof marker, while the 1975-1977 model years use the 97 bulb, making the two types non-interchangeable across this production span.
The wattage difference between the 168 and the 97 means the socket wiring and housing for each generation are matched to different current loads, which is a relevant fitment consideration.