* Online Repair Manuals: Sites like Haynes.com or ChiltonDIY.com often sell downloadable repair manuals. These manuals usually contain detailed wiring diagrams. Look for a manual specifically for a 1999 Chevrolet Cheyenne.
* Factory Service Manual: This is the most comprehensive source, but also the most expensive. You might be able to find a used copy online (eBay, Amazon) or through a parts store that specializes in older vehicles. These manuals often have color-coded wiring diagrams.
* Online Forums: Search Chevrolet truck forums (like those on sites dedicated to Chevy trucks) for "1999 Cheyenne running light wiring diagram." Someone might have already posted one or have advice on finding one. Be sure to specify the body style (e.g., extended cab, regular cab) as wiring can differ slightly.
* AutoZone, Advance Auto Parts, or similar: Some auto parts stores offer free access to wiring diagrams in their stores, either in a book or through a computer terminal. It's worth checking with them. They may require your vehicle's VIN.
Important Considerations:
* Year and Trim Level: The wiring diagram will be slightly different depending on the exact trim level (LS, LT, etc.) and options your truck has. Providing this information when searching online will improve your chances of finding the correct diagram.
* Safety: Working with car electrical systems can be dangerous. If you are not comfortable working with electricity, it's best to have a qualified mechanic perform the work. Always disconnect the battery's negative terminal before starting any electrical work.
Remember to double-check that the diagram you find is specifically for a 1999 Chevrolet Cheyenne and matches your truck's options. The diagrams are usually quite detailed, but may use abbreviations and symbols you need to understand.
