1. Vehicle Repair Manuals: You can find wiring diagrams in vehicle repair manuals specifically for the 1983 C10. These manuals are often available online or at automotive stores. Some popular options include the Chilton or Haynes repair manuals.
2. Manufacturer Websites: Some vehicle manufacturers provide wiring diagrams for their vehicles online. Check the Chevrolet website or the specific parts catalog for your vehicle to see if they offer wiring diagrams.
3. Online Automotive Forums: Online automotive forums dedicated to Chevrolet or C10 trucks may have wiring diagrams shared by other users. Joining a relevant forum and searching for wiring diagram-related posts can be helpful.
4. Wiring Diagram Suppliers: Companies specializing in automotive electrical components and diagrams may also provide or sell wiring diagrams. An example is Standard Wiring, known for its extensive collection of automotive wiring diagrams.
Remember that working with electrical systems requires caution, and it's always best to consult with a qualified mechanic if you're not confident in performing electrical work.