why don't the headlights work on my 06 Hyundai Tucson?

[Rodger C]

I have an 06 Tucson, the DRL's work fine,but when I turn the headlight switch on,the DRL's go out,but the headlights don't come on either beam. Bulbs are good, fuses too. There is power going to the headlight relays, on the main terminal,but doesn't seem to be any power on the switching terminal..any ideas? The park lights work fine...
Tks,
Rodg