* Factory Service Manual: This is your best bet. A 1980 Cadillac Brougham factory service manual will contain detailed wiring diagrams, including the one for the wiper relay. You can often find these manuals through online retailers like eBay, Amazon, or specialized automotive parts websites. Look for manuals specifically labeled as "wiring diagrams" or "electrical schematics."
* Haynes or Chilton Repair Manual: These are less comprehensive than factory manuals but often include simplified wiring diagrams. Again, check online retailers or automotive parts stores.
* Online Forums and Communities: Websites and forums dedicated to classic Cadillacs or GM vehicles (like the Cadillac Owners forum) might have members who have scanned relevant pages from their manuals or have experience troubleshooting the wiper system. Searching for "1980 Cadillac Brougham wiper wiring" or a similar phrase might yield results.
* Local Auto Parts Stores: Some larger auto parts stores might have access to digitized versions of repair manuals or wiring diagrams, though this is becoming less common.
Important Note: When working with car electrical systems, always disconnect the negative battery terminal before starting any work to avoid short circuits and potential damage. If you're not comfortable working with automotive electrical systems, it's best to take your car to a qualified mechanic.
