The Ford C-Max brake light requires a 7443 bulb size for proper installation and function within the rear lighting assembly. Available data for the specified component covers the period from 2013 through 2018.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford C-Max uses the 7443 bulb for its brake lights across the 2013-2018 model years.
The 7443 is an ANSI-standard dual-filament wedge bulb in the T20 form factor, rated at 12V with a 21W/5W output, where the higher wattage filament serves the brake function and the lower wattage filament serves a secondary role such as running lights.
As a dual-filament type, the 7443 is not interchangeable with single-filament bulbs of similar physical size without a loss of one lighting function.
The Center High Mount Stop Light on the Ford C-Max uses the 12961 bulb across the 2013-2018 model years.
The 12961 is a Philips part number designation for a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base, rated at 12V and 5W.
The T10 form factor of the 12961 is physically smaller than the T20 form factor of the 7443, making the two bulbs non-interchangeable despite sharing the same 12V operating voltage.
The W2.1x9.5d base on the 12961 is a wedge-type base, meaning it is held in place by contact pressure rather than a bayonet or screw mechanism.