Brake Lights Flicker?

[truck1014]

on my 2000 gmc sierra 1500 5.3 with 187,000 miles, when i go to put the window up at night the headlights dim terribly and the radio loses a little power, and also ive been told that at night my brake lights dim and flicker accationaly .. even the dash flickers a little until i give it a little gas lol ..?? is it because of all my audio stuff? i mean it just started doing it though.. whats the deal???

[Alljackedup408]

what kinda voltage is ur alternator putting out??? that could very well be the issue.

[pennzoil29]

You may also have a loose ground wire.