I'm having similar problems with my 97 2-dr Tahoe. The high beams will flip to low beams by themselves. Running light dash light comes on/off. High beams will turn back on when they feel like it. Makes for an interesting ride especially at night. I had one mechanic tell me he wants to do further diagnostics on it, but that he felt like it was due to wiring from steering column too. I haven't gone back yet for that because I've also got a CO2 sensor that's gone bad and that's $120+.....All I wanted to do was get this damn truck rust free, painted, get flares off/trim on and new nerf bars on and it's one step forward and two steps back, three to the side with my shoes untied. It has been non-stop with truck. Still look for pillar post that of course GM discontinued. (I used to deal with GM and its always been fun how they know you need parts A-F but discontiue parts C & E) Has anyone had ANY luck with headlight issue?