There isn't a single, universally easy-to-find picture online showing the *exact* location across all 1965 Impalas, as the dash trim varies slightly. Your best bet is to:
1. Consult your owner's manual: If you have the original owner's manual, it will have a diagram showing the fuse box location.
2. Check online forums dedicated to 1965 Impalas: Websites and forums dedicated to classic car enthusiasts often have detailed information and photos from other owners who have tackled similar tasks. Search for "1965 Impala fuse box location" on sites like Impala forums or general classic car forums.
3. Look carefully under the dash: Systematic visual inspection is your best bet. Carefully examine the area under the dash on the driver's side, looking for a panel that might be removable or an area where wires seem to converge.
Remember to disconnect the negative battery terminal before working on the electrical system to prevent accidental short circuits.