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A circuit should have a power source like electricity supplied by means of a wall socket, battery, or generator. All electrical circuits need a load. When tracing different automobile wiring diagrams, you must recognize the different wiring circuits used in your engine.
Wires on some places want to cross one another, but it doesn’t automatically mean that they connect. With 4 wire system there’s no blue wire. You’ll observe the colored individual wires when they exit the typical sheathing at every end.