I turn on the headlights and the dash lights and the tail lights dont come on, is this a fuse or is the headlight switch bad?

Do the headlights still work? Double check all the fuses. The actual headlight switch could be bad. It's common for the multifunction switches to go bad.

No. Dash lights being out could be a bad headlight switch, since the dash lights are routed through the headlight switch, not the dimmer switch. Park and tail lights also controlled by the headlight switch.

tail lights and dash lights should be on th same fuse and sounds like u have a bad headlight bulb also 2 problems!

possible lite switch needed

headlight switch bad,possibly a bad dimmer switch they do short out in time

The relay has nothing to do with the tail lights, but replacing the switch sounds like a good idea. There's a nut holding it in place, see http://www.skandix.de/en/spare-parts/electrics/switches/switch-headlight/1027524/ to get an idea of the construction. And the price. This is not worth fiddling about unreliable workarounds...
In addition, if fuses 15 and/or 16 burn frequently there might be a problem with the tail light cabling.

Good luck
Ingo

look for the relay for the parking light

head light switch is bad

disconnect head lights, and replace fuse. Then turn the light back on to see if it blow a fuse again. if not, plug on light in at a time. You might have a bad headlight???? then unplug that one if nothing happens. Then plug the other one in. It could also be a bad taillight bulb. I have had bad tail light bulbs. Do all of them, one at a time.

You would have to check and see if you are getting any power out of the light switch. There is a seperate wire for the headlights and the dash lights.