Ford Sprint Map Light Bulb Size

The Ford Sprint map light requires bulb size 631 or 1895 depending on the specific application. Data for the bulb sizes covers the range from 1963 to 1964.

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
1964	631
1963	1895

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	631
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 0.9W.	1895

Other Locations

Additional Notes

The Ford Sprint map light draws from two distinct bulb types across its 1963-1964 model years, with each year using a different specification entirely.
The 1964 Ford Sprint map light uses the 631 bulb, an ANSI-standard single-filament type with a BA15s bayonet base, rated at 12V and 21W.
The 631 is a variant of the 1156 bulb family, sharing its BA15s bayonet base design, which is a single-contact base that locks into the socket with a twist.
At 21W, the 631 is a relatively high-output bulb for an interior map light application, reflecting the electrical design standards of mid-1960s vehicles.
The 1963 Ford Sprint map light uses the 1895 bulb, an ANSI-standard miniature wedge type in a T5 form factor, rated at 12V and 0.9W.
The T5 designation refers to the bulb's tubular shape, with a width of 5/8 of an inch, making it a significantly smaller physical unit than the 631.
At 0.9W, the 1895 draws considerably less power than the 631 used in the following model year, reflecting a fundamentally different circuit and socket design.
The BA15s bayonet base of the 631 and the wedge base of the 1895 are mechanically incompatible, meaning the two bulbs are not interchangeable between the 1963 and 1964 model years.