bad fuse or relay switch
its normal. its so the lights on the inside of your car aren't bright enough to impair your vision while looking outside
A weak alternator and/or battery.
could be the alternator is about to go out
Headlights have two filaments, one for dim, one for bright. From your description it appears that one of the high beam filaments is burned out. Replace the bulb.
The lights on your vehicle may be going dim because the bulb is getting ready to blow out. Try changing your bold and see if that helps.
The alternator is probably getting weak and not charging as much as it should. The belt could be loose and slipping some.
Could be bad bulbs (double filamented) or bad dimmer switch
I was driving down the road and my car lights went dim and my 1992 lumina started to lose power.
What kind of flicker do you mean? I own an '05 Aveo (my first car) and I find that my running lights get dim, go back to full brightness, and repeat. My interior clock goes in and out too. Why I mention the clock is that when I did a little research, I found that the circuit for the clock and the headlights are connected. After checking it out, I found that when the lights are bright, the clock is out, and when the lights were dim, the clock was on. I don't know if this is your issue, but it could help.
I would check all the wiring first. Then, you should probably figure out if any lights need to be replaced. That's my guess.
The lights are automatic for your daytime running lights AND your regular head lights. There is a light sensor on your dash that knows when it get dark. When it's dark your headlights will automatically come on, daytime lights turn off and your dashboard lights will dim as a result, since you no longer need them to be that bright when it's dark. As far as the parking brake, it triggers your daytime lights to turn off, so when you disengage your parking brake, they will turn on for normal driving. All of this is a good thing because you never have to worry about turning your on/off...ever.
You could have a blown fuse, these lights may also have a knob to dim them make sure this is on.