We are having problems with our new truck. Its a 2000 Chevy 2500 silverado Somehow the lights are messed up and we can't figure it out. THis is confusing so, bare with me. When the plow lights are on the left head light is out. This only happens when it is on low beam. I know its the bulb, already checked that. When you put the high beems on, they work fine. This is the tricky part. When you put the left turn signal on, the head light along with the running lights blink, including the truck head light!! I checked the grounds and connections, so any thoughts would help. I would take it in to get looked at, but we are expecting more snow and don't have the time.