A wiring schematic is a line diagram of an electrical circuit showing all the components needed to
operate the circuit and the wiring paths that connect them. Back in the early days, a diagram including every
circuit on the car would only take up a few pages. Today, it can add up to a small book. That is one reason that
many schematics have been simplified into "block" diagrams, focusing on just one circuit and
showing only those elements needed by that circuit.
The Electrical System Roadmap
—
by