Why would the hi beams work and the low beam not?

If the high beams are functioning while the low beams are not, it could indicate a problem with the low beam bulbs, such as a burned-out filament. Another possibility is a blown fuse specifically for the low beam circuit. Additionally, issues with the headlight switch or wiring could also prevent the low beams from operating while allowing the high beams to function properly. It's advisable to check the bulbs and fuses first before investigating further.