Free wiring diagrams are available on websites such as FreeAutoMechanic.com and WilsonAutoElectric.com, but many other websites require a subscription fee in order to access their diagram database. For example, AutoZone requires a membership in order to access its wiring diagrams for do-it-yourself repairs.
Some wiring diagrams may be printed inside a vehicle's manual, which is given to the vehicle's owner upon purchase. Wiring diagrams are also located within the automotive repair manual of a given model of vehicle. As of 2015, some of these manuals are priced at about $20 on various websites, such as Haynes.com. Some specific vehicle wiring diagrams may be impossible to find at no charge.