* Your Corvette's Owner's Manual: The most likely place to start. Check the section on engine maintenance or electrical systems.
* Haynes or Chilton Repair Manuals: These manuals are readily available online and in auto parts stores. They usually have detailed diagrams and explanations.
* Online Automotive Repair Databases: Sites like AllDataDIY or Mitchell1 (subscription required) offer comprehensive repair information, including wiring diagrams, for various vehicles.
* Factory Service Manual (FSM): This is the most detailed manual, usually used by mechanics. Finding a digital copy might require searching online forums dedicated to Corvettes or eBay.
* Online Corvette Forums: Forums dedicated to Corvettes (like CorvetteForum.com) often have members who can help you find the diagram or even provide a picture from their own manual. Searching the forum for "1986 Corvette spark plug wiring diagram" is a good starting point.
Important Note: The 1986 Corvette came with different engine options (e.g., L98, etc.). Make sure you specify the *exact* engine you have when searching for the diagram. The wiring will vary depending on the engine.
