I want to update my headlights , they are not bright. Been looking at a Supernova Led. But anyway. My question is , on a 2001 silverado , on low beam only one light is on. OK good. On high beam , only one beam on. Shouldn't both be on. Then I checked our blazer , same. One light at a time. I would think that on high both would be. I really didn't pay any attention until now.