Free Wiring Diagrams - No Joke - FreeAutoMechanic Just submit a request for the wiring diagram you want (ex. "Need wiring diagram for charging system") We will provide you with the basic free wiring diagrams in an email that can be viewed, saved or printed for future use. Automotive basic wiring diagrams are available free for domestic and Asian vehicles. Classic Car Wiring . Com : Home of the original color All wire colors (including tracers) and component information is from the original factory service manuals. This means the wire colors on the diagram are the same as what was originally in your car. Diagram covers the complete basic car including: interior and exterior lights, engine & engine compartment, firewall, under dash, instrumentation, etc.