Re: Stupid Question #2: how does an iron frame act as a ground on our cars
Steel and iron are excellent conductors of electricity. The frame is used instead of running a "common" grond wire. It was a pretty common practice back in the day and was part of keeping the cost of cars down. Separate ground wires are better, and used a lot more on modern cars because so much of new cars are made using plastic parts which don't conduct electricity.
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