* Online Automotive Parts Websites: Websites like AutoZone, Advance Auto Parts, and Napa Auto Parts sometimes have free wiring diagrams available, although you might need to register or browse their online catalog for the specific year and model. Search for "1978 Pontiac Trans Am wiring diagram" (using a year within your range) and look for downloadable PDFs. These diagrams might not be as detailed as a factory manual.
* eBay or Online Forums: Search eBay for "1977-1979 Pontiac Trans Am service manual." You might find a used factory manual or a reproduction. Online forums dedicated to Pontiac Trans Ams (like specific forums on sites like www.thirdgen.org or others focused on classic cars) are excellent resources. Someone there may have scanned sections of a manual or have a diagram they're willing to share. Be sure to carefully phrase your search; specifying "power window" will help you filter out irrelevant results.
* Haynes or Chilton Manuals: While less detailed than factory manuals, Haynes and Chilton repair manuals often include wiring diagrams. Check their websites or local auto parts stores for availability. These manuals might not have the level of detail needed for a very specific problem.
* Local Libraries: Some libraries have collections of automotive repair manuals.
Important Note: Remember that even with a wiring diagram, working with car electrical systems can be risky. If you're not comfortable with electrical work, it's best to take your car to a qualified mechanic. Improper wiring can cause damage to your car or even create a fire hazard.
Remember to be as specific as possible in your searches (year, make, model, and "power window wiring diagram"). Good luck with your search!
