The Kettering system (Figure 1) used a single ignition coil to produce a high voltage, which was passed to a rotor arm that effectively pointed the voltage to a series of electrical contacts located in the distributor assembly (one contact for each cylinder). ![]() The battery, a generator and a more complete vehicle electrical system provided a relatively stable electrical supply to the ignition coil. ![]() For the first time, he devised an electrical system that powered the starter motor and ignition at the same time. The first coil-based ignition system is credited to the American inventor Charles Kettering, who developed a coil ignition system for a major vehicle manufacturer around 1910/1911. ![]() Although ignition systems have certainly evolved over time – in particular incorporating more and more electronics – they still bear the hallmarks of the original coil ignition systems that were introduced more than 100 years ago.
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