Ok so I have not messed with any of the wiring and all of a sudden i started up the blazer, the low beams did not work. I checked the interior fuses and the engine comp fuses. They were all fine. I also checked the headlights themselves and they seemed fine. Now the low beams will not come on, but the high beams do. Even if I go to turn the switch in the car to on for the low beams there is still nothing. Usually they would jus go on by themselves but there is no light coming from them. What is the deal...anyone?

 

had a similar problem and it turned out the dashboard light switch was faulty. I knew it wasn't that uncommon when autozone stocked the part too. I've also heard of the day time running light sensor in the dash having problems as well. good luck