* Haynes or Chilton Repair Manual: These manuals are readily available at auto parts stores and online retailers. They usually include comprehensive wiring diagrams. Make sure you get one specifically for a 1991 Ford Aerostar.
* Ford Dealer or Parts Department: A Ford dealership's parts department might be able to access the wiring diagram through their computer system, though they may charge a fee.
* Online Forums and Communities: Search online forums dedicated to Ford Aerostars or classic Ford vehicles. Someone in the community may have a scanned copy of a wiring diagram they're willing to share. However, be cautious about the reliability of information found on forums.
* eBay or Similar Sites: You might find a used repair manual or a standalone wiring diagram on eBay or similar online marketplaces.
Keep in mind that the specific wiring diagram you need will depend on the options your Aerostar had (e.g., engine type, automatic vs. manual transmission, etc.). The diagrams in the repair manuals usually have sections dedicated to different systems (lighting, fuel injection, etc.).
