A power distribution center is used to route positive battery power throughout the vehicle using relays and fuses. This center is powered directly off of the positive post of the battery using a positive battery cable.
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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