Ford F-350 Map Light Bulb Size

The Ford F-350 map light requires a bulb size of 105 for the interior lighting system. Data for the specified component covers the range from 1985 through 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
1988-1997	105
1985-1986	105

Bulb Specifications

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

Other Locations

Additional Notes

The Ford F-350 uses the 105 bulb size across all listed model years for the map light position.
The years covered by these specifications span 1985-1997, with the 105 bulb designated for the map light throughout.
The 105 is an ANSI-standardized bulb type recognized in both the United States and Canada.
This bulb operates at 12 volts with a 13-watt output, which is typical of low-intensity interior lighting applications.
The 105 uses a BA15s bayonet base, a single-contact fitting where the bulb is inserted and twisted to lock into place.
The single-filament design of the 105 means it serves one lighting function only, with no secondary filament for a reduced-brightness mode.
The 105 is a variant of the 1156 bulb. While the two share the BA15s bayonet base, they are not identical, and substitution between them warrants attention to wattage and voltage tolerances before use.