So I've got a 2002 Silverado that refuses to turn on it's headlamps. The switches of course don't work and all the fuses have been checked. I've also changed the relay in the fuse box for the headlamps as well and nothing. All of the other lights work except for the headlamps. The brights even work but the headlights will not. I'm on the verge of changing both bulbs but I can't picture both of them going out at the same time. Any ideas anyone?