1. Your Owner's Manual: The most likely place. Check the manual thoroughly; it should have a section dedicated to fuses and relays, often with a diagram.
2. Ford's Website (Possibly): Ford's website might have some archived information, but finding documentation for such an old vehicle is challenging. Their parts lookup might be more helpful (see below).
3. Online Repair Manuals (Haynes, Chilton): These manuals often include detailed wiring diagrams and fuse box layouts. Search for "1985 Ford E350 Haynes manual" or "1985 Ford E350 Chilton manual" on sites like Amazon or eBay.
4. Ford Parts Department: Contact a Ford dealership's parts department. They might have access to the diagram, though they likely won't give it away for free. Explaining you need it for repairs might help. They can also use your VIN to specify the correct diagram for your exact truck model.
5. Online Forums: Search specific Ford E-Series forums (e.g., forums dedicated to classic Ford trucks). Someone might have already scanned or photographed their fuse box diagram and posted it.
Important Considerations:
* Multiple Fuse Boxes: The 1985 E350 likely has multiple fuse boxes (one under the hood, possibly one inside the cab). The diagram will likely show the locations of all.
* VIN Number: Your vehicle's Vehicle Identification Number (VIN) is crucial. Slight variations in trim or options could mean differences in fuse box layouts. Providing this number to a parts department will ensure you get the right diagram.
Start with your owner's manual and then proceed to the other options. Good luck!
