* Haynes Repair Manual or Chilton Repair Manual: These are widely available at auto parts stores and online retailers. They contain detailed wiring diagrams for most Ford Tempo models. This is generally the best option for accuracy and comprehensiveness.
* Online Forums: Search online forums dedicated to Ford vehicles or classic cars. Sites like Ford-trucks.com (even though it's truck-focused, they often have broader Ford discussions), or dedicated Tempo forums (if you can find one) might have members who have scanned diagrams or can point you to a resource. Be aware that information found here might be less reliable than professional manuals.
* eBay or similar auction sites: You might find a scanned copy of a wiring diagram or a repair manual on sale.
* Your local library: Some libraries have access to repair manuals through subscription services.
* A Ford dealership (as a last resort): They might have access to diagrams, but it may cost you money.
When searching, always specify the year of your Ford Tempo GL. The model year is crucial for finding the correct wiring diagram. Without it, you'll likely find incorrect information.