* Auto Parts Stores: Major auto parts stores like AutoZone, Advance Auto Parts, NAPA Auto Parts, and O'Reilly Auto Parts may have some harnesses in stock, or be able to order them. Be prepared to provide your vehicle's VIN (Vehicle Identification Number) for the most accurate match. They likely won't have full schematics available to the public.
* Online Retailers: Websites like eBay, Amazon, and specialized auto parts websites often list used or new wiring harnesses. Again, the VIN is crucial for a proper fit. Be cautious when buying used parts; inspect listings carefully.
* Junkyards/Salvage Yards: A local junkyard or salvage yard with Pontiac Sunfires might be your best bet for a used harness at a lower cost. You'll need to physically inspect the harness to ensure it's in good condition.
* Dealership: A Pontiac dealership (if one still exists nearby or has parts availability) might be able to order a new harness, but this will likely be the most expensive option.
* Repair Manuals: Repair manuals (like Haynes or Chilton) for your specific year and model Sunfire *might* contain some wiring diagrams, but usually not a full schematic of the entire harness. They tend to focus on individual circuits and components.
Regarding Schematics: Complete wiring schematics for vehicles are usually considered proprietary information by the manufacturer. You're unlikely to find a complete, free, and easily accessible schematic online. Dealerships sometimes have access to these, but are unlikely to share them freely.
Important Considerations:
* VIN: Always provide your vehicle's VIN when ordering parts to ensure compatibility. Different options and trims can have variations in wiring.
* Condition: If buying a used harness, carefully inspect it for damage, corrosion, or broken wires before installation.
* Professional Installation: Wiring harnesses are complex. Unless you have significant electrical and automotive experience, it's strongly recommended to have a qualified mechanic install the harness. Incorrect installation can lead to electrical problems or even a fire.
Start with the auto parts stores and online retailers. If those avenues are unsuccessful, proceed to junkyards and finally, as a last resort, the dealership. Remember to always use your VIN for accurate part identification.
