Sound driving me crazyyyyyyy

OK, so the gsx is braking down ( like thats new ). Brakes went bad so I got new ones. Front right CV shaft went bad in like 2 days s I changed it. Handle broke so I got one from the dealer. Window stopped working so that took a day to fix. So when everything looks perfect, something else goes wrong.
Here is my problem.

When I turn the car on its all good. When I turn the lights on or press the brake pedal a continues sound BEEEP goes on. When I let go of the brakes or turn the headlights off the sound goes off. It wont stop beeping when I am pressing the brake on a stoplights or when I have my foglights on. Is that some kind of warning for my battery not getting charged or alternator overloading or something? I cant figure out what the sound is for. I have no check engine lights or anything. Come on guys, help me out here.

Thanks

Never heard of that.. and I ran the car with no alternator. Didn't get any beeping at all. Where is it coming from?

Sound is coming from behind the top vents where the rear defroster button and hazard switch is. Its a constant beeping when I use brake or foglights.

Does it sound like the same noise when you leave the keys in the car with the door open or you leave the lights on with the car being off?

how good it your battery and alt.? i had that too but if i remember i change m battery cuz it goes almost shot and it fixed it. i think it is one of those because when you have our lights on, then pressing brakes(which turn on more lights on the rear), it takes more power.does the sound ALMOST sound like the blinkers?