A relay wiring schematic diagram is a graphic depiction of an electrical or electromagnetic circuit. Using symbols and lines, the diagram illustrates the flow of the electricity through various relays.
A circuit is series of relays that conducts electricity and forces it through various logic states. The origin of the electrical signal is a power source such as a battery, and in a complete circuit, the electricity flows back to the power source. The schematic diagram illustrates the relays through which the electricity passes on its journey through the circuit. Circuit wiring may be in parallel with electricity flowing through different relays, or it may be in series with the current flowing through the same components.