* Online Parts Stores: Websites like AutoZone, Advance Auto Parts, and Napa Auto Parts often have online catalogs. While they might not offer free diagrams, you can often find the diagrams if you search for your specific vehicle year, make, and model and then look for electrical components or repair manuals. Sometimes you need to purchase a manual to gain access to it.
* eBay or Online Auction Sites: Search for "1989 Dodge Ram Charger repair manual" or "1989 Dodge Ram Charger wiring diagram." You might find a scanned copy of a factory manual or a standalone wiring diagram. Be cautious about the quality and authenticity of these sources.
* Haynes or Chilton Repair Manuals: These publishers create repair manuals for many vehicles, including older trucks. Check their websites or your local auto parts store. These manuals typically include wiring diagrams.
* Specialty Vehicle Parts Suppliers: Websites that specialize in parts for classic or older Dodge trucks might have access to wiring diagrams or know where to find them.
* Your Local Mechanic: A trusted mechanic, especially one who works on older vehicles, might have access to a wiring diagram or a repair manual. This is likely your best option if other methods fail.
Important Note: Wiring diagrams are complex. If you are not comfortable working with automotive electrical systems, it is strongly recommended you seek the assistance of a qualified mechanic. Improper wiring can lead to damage to your vehicle or even injury.
