Had that problem when still under warranty on my 02 when all lights would momentarily flicker, including the head lights, and the dealer replaced my alternator. There was a service bulletin put out on that problem. Also just recently, my lights would dim and I found a broken ground wire on the left front side on my engine block after checking all ground connections. Good luck.
Flickering lights, on a Cadillac STS, is usually a sign of a loose wire. When all of the lights flicker, it is an indication of a loose battery ground cable.
Might be a weak battery
power surge. happens all the time
On my Lexus I had an issue with the lights staying off when it was cold. This was the case for all of my dashboard lights. Then they would flicker back on. There are Caps on the board for the instrument panel that were blown. This was the case for my fuel cage that didn't work consistently work as well
check for blown fuse. Or check and see if fuse is in all the way.
If all of the lights flicker I would check for a loose or corroded ground. If only 1 light flickers then check to see if the bulb is properly plugged in to its socket, or if there is dirt, corrosion or rust causing a poor connection.
Check all fuses. Wait until dark. Park where you could see the glow of the brake lights from inside the truck, were they to illuminate. Press and hold the brake pedal. Wiggle the turn signal switch about for a few seconds. If this causes the brake lights to work or to flicker, replace turn signal switch. Move tilt steering up and down. If this causes the brake lights to work or to flicker, replace turn signal switch. Switch 4-way flash hazard lights on and off a few times. See if that does anything interesting. Check for Body codes.
The rheostat in the light stalk is dirty and getting a bad connection causing the dash lights to flicker dim to bright and so on. Try turning the reading and dash lights on and off several times moving the rotary switch from all the way off to all the way on abd back several times. This sometimes will clear the problem for a period. If not, the light stalk will require replacement.
I would say 1 of your door switches are bad or your door doesn close all the way.
your headlight switch needs to be replaced. My Lincoln had the same problem, it all stems from the auto dimmer feature...replace the headlight switch (mine was 70-100 dollars) and your lights will work fine.
Not in all of them. Flicker is new and they show some old episodes. But in the new episodes, Flicker is usually in them
Check the voltage levels. If the regulator is having a little trouble, the voltage may jump around a little. It's usually not much of a problem, but if you're very concerned, take the vehicle to an auto parts retail store that has the ability to check your charging system. my problem on my Chevy blazer was the keyless entry http://www.youtube.com/watch?v=E9qlLrQ6v5E