Here are the most common locations, in order of likelihood:
1. Under the dashboard, on the driver's side: This is the most likely location. Look closely under the dash, possibly behind the glove box or lower down near the steering column. You might need a flashlight and to feel around. Sometimes a small access panel needs to be removed.
2. Under the hood: Less common for the main fuse box in a '65, but there might be a smaller fuse box or a relay center under the hood. Check near the battery.
3. In the glove box (rare): While uncommon for the main fuse box, some early Mustangs *might* have had a small fuse panel within the glove box.
Tips for finding it:
* Consult your owner's manual: If you have the original owner's manual, it should have a diagram showing the fuse box location.
* Use a 1965 Mustang shop manual: These manuals provide detailed diagrams and information about the car's systems, including fuse box locations. You can often find these online (for purchase or sometimes as PDFs).
* Online forums and communities: Search online Mustang forums (like Mustang forums or the Mustang Club of America forums) for "1965 Mustang fuse box location." Someone else has likely had the same problem. Include the body style (coupe, convertible, fastback) in your search.
* Look for wiring harnesses: Trace the thicker wiring harnesses from the battery and other components. The fuse box is usually located where these harnesses converge.
Be patient and methodical in your search. The fuse box is there, it's just often well-hidden! Good luck!