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.
Both Fox and Overholser agreed that a voltmeter is both safer and a more accurate gauge of the system’s health. First, not all the power has to go through them.
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