I am having this same issue. I have a 2010 DJ 3.5L v6 and when i turn on the car the headlights and high beams will flicker but not turn on. I got a new battery because i thought that was the issue and it fixed it for like a day and then started doing it again. Now, the headlights will work perfectly fine one morning, i will park it, and the next morning they wont turn on, only flicker. I really need help figuring out this issue if anyone knows, I have to get from work and back and idk what else to do.