My Ford Falcon 2005 low beam headlights aren't working, however the high beams and park lights work fine. Please help.

The relays are next to your battery. The first one is the horn relay (the yellow one closest to the headlight), then the lo and high beams after that, I forgot which order, and then the starter relay.

Get a freind to check which one clicks when you turn on the high beams (put your finger on it), and swap it over with the one next to it.

Check to see if the headlights work, but the high beams not. If this is the case, the relay is fried. If the high beams are still not working, then check the contacts in the combination switch (on the steering column), or the wiring... this is a bit more difficult to trace, none the less, not that difficult.