Free Wiring Diagrams - No Joke - FreeAutoMechanic Wiring Diagrams This is not an automated service. Each Diagram that is requested has to be hand selected and sent. As this is a free service it receives an overwhelming amount of requests and may take up to a week or longer for a response. Just submit a request for the wiring diagram you want (ex. "Need wiring diagram for charging system") Wiring diagram - Wikipedia A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the power and signal connections between the devices. A wiring diagram usually gives information about the relative position and arrangement of devices and terminals on the devices, to help in building or servicing the device.