* Haynes Repair Manual or Chilton Repair Manual: These are readily available at most auto parts stores and online retailers. They usually contain detailed wiring diagrams, often sectioned by system (e.g., lighting, ignition, etc.). These are your best bet for a comprehensive and relatively inexpensive option.
* Ford's Official Repair Manual (OEM): These are the most accurate but also the most expensive. You might find a used copy online or through a mechanic, but new ones can be pricey. They're also often more technical and less user-friendly than Haynes or Chilton manuals.
* Online Forums and Communities: Websites like Ford-trucks.com or Explorerforum.com often have members who may have scanned copies of diagrams or can offer assistance. Search the forums using keywords like "1994 Ford Explorer wiring diagram," specifying any particular system you're interested in (e.g., "1994 Ford Explorer 4x4 XL headlight wiring diagram"). Be prepared to sift through a lot of information.
* AutoZone, Advance Auto Parts, or similar websites: Some auto parts store websites offer free online access to wiring diagrams, although coverage varies by vehicle. Try searching their websites using your vehicle's year, make, and model.
Important Considerations:
* Specificity: The more specific your search terms, the better your chances of finding the right diagram. Knowing the specific system you're working on (e.g., tail lights, fuel pump, etc.) will greatly assist your search.
* Year and Trim Level: While the general wiring may be similar across different trims of the 1994 Explorer, slight variations can exist. Specifying the "4x4 XL" trim is helpful.
* Diagram Quality: Be aware that some online diagrams may be low-resolution scans or poorly copied, making them difficult to read.
Remember to always disconnect the battery's negative terminal before working with any automotive wiring to prevent electrical shocks or damage. If you're uncomfortable working with electrical systems, it's best to consult a qualified mechanic.