Ef falcon I have a number of electrical faults no park lights no dash lights and no driving lights I have check all relays and they work fine .. Could I be using the wrong relays ?? Or would it be a faulty bcm ?

Mayby something is not earthing properly

Had same problem in my EF, it was a short in the brake lights that kept blowing fuses, yours may not be the same but worth a look!

Try checking your dash bulbs etc. if that fails try replacing your headlight switch altogeather