1990 F150 2WD single cab 4.9. Hi, I changed my dash cluster bulbs to LED. They were all working. I then changed the small bulb that lights up the wiper and headlights ***** at the bottom left side of the dash and everything quit working. I played with all the bulbs and even turned them 180 degrees in the sockets. They worked both ways prior to them going out. I’m praying it isn’t a huge problem. Thanks for the help.

 

Have you tried putting the old bulb back in there? Have you turned the headlight **** a bit to see if it's a bad spot on the rheostat?

 

old bulb didn’t work either. Headlights and taillights are still working. All fuses were intact. Dimmer **** doesn’t change a thing except the brightness on the ac lights.

 

It was the headlight switch.