Medium duty fuses are used to protect average amperage circuits such as power windows and seat heaters. These fuses also provide an observation window which is needed for inspection.
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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