The battery supplies both positive and ground circuits which complete the electron cycle. The positive side of the system circuit starts at the PDC provided by the battery.
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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