The ignition switch is what controls the electrical system within a locking mechanism that utilizes a key for security. These keys possess a frequency chip as an added theft deterrent.
Most components, however, require DC current to run. The solution is a set of diodes that serve as a kind of electrical check valve for current coming out of the alternator. Diodes only allow current to flow in one direction, so when AC goes in on one side, only DC comes out on the other.
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