The ingenious American engineering behind early sequential signals in Ford Mustangs and Mercury Cougars

By rotating a cam assembly, three lobes completed circuits for individual bulbs: inner, middle, and outer.
The electric Ford Mustang Mach E SUV is the latest FoMoCo product to feature sequential turn signals, blinking taillights that show, by flashing individual LED bulbs, the direction you’re turning. But what if I told you this is old technology, nothing new, and first saw use in the mid-1960s?

First introduced on the 1965 Ford Thunderbird and popularized on the more powerful Ford Mustang and Mercury Cougar, sequential turn signals were a novel way to differentiate Ford products from the rest of the muscle cars.