I know this is farely common in our trucks with these years. Right now with planning a funeral and work I dont have alot of time to get out and troubleshoot it properly so I'm asking for some advice to hopefully get it going tonight. I'm supposed to be driving to Georgia monday night so I definatly need them working haha. I have a 92 silvy. Last night I was rushing to my parents house. I noticed the lights flickered a little bit when I first got in the truck but the 20 minute drive they worked perfectly. After the truck sat for an hour I went back to it, started it up and have no headlights now. The parking lights turn on, blinkers and all the other lights work. It slipped my mind to see if the hi-beams work which I'm going to do in just a moment. I replaced the switch which had a burn mark on one of the prongs but that didnt do anything. What other things can I check? I also swapped the 2 silver colored relays below the steering wheel and nothing changed. I'm thinking it could possibly be a bad ground but like I mentioned I'm strapped on time for troubleshoot. Thanks in advance for any help. I really appreciate it.