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.
Naturally the chassis and body need to ground on the same component, but Fox suggested grounding critical components like the headlights, taillights, and dashboard directly to the engine block or transmission.
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