headlights not working and......

So my headlights decided not to work anymore. The brights only work if I hold the switch/toggle back. Foglights are working fine. If I turn the lights from the on position to off quicky, the marker light remain on? Also, an older issue, I get a tailgate open alert and the inside lights flash on and off while braking. Wait, not done yet! Door lock also dont work from the inside, also an older issue. If anyone could guide me in the right direction, that would be great.

Sorry, I posted in the wrong section. I have a 03 kj.

Battery issue maybe