Rear and dash lights stop working

I installed a new head unit. I did it by splicing the old harness (from a old sony HU) and wired a JVC head unit. Now when i pull my knob for my lgihts out, only my front outside lights come one, but if i push the knob in so the dim (running lights) are supposed to be on, my dash lights come on but my running lights dont. So if i fiddle with the knob i can get both the dash and outside lights to come on. Any idea what this is. I checked the fuses for my lgihts, they are fine. I drive a 1989 FOrd Bronco II 4WD. I tried looking at a wiring diagram and its gibberish to me. IM a noob at this. Any help will be greatfull

You say you fiddle with the switch and it works- that points to a bad switch.My ex once told me I have a perfect face for radio.

did you hook up your illumination wire?  Disconnect it, if that dosn't fix it, run to the junk yard and grab a used switch.2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.

ok, ill unhook the illumination wire. If that doesnt work then ill get me a new switch., thanks for the help

it seems to be the switch, i unhooked the illumination wire and the same thing happened, i also have 2 dimmer wires comming from my harness, should those be connected?