I've got a 2002 2500hd, 6.0 vortec The digital gear selector on the dash is starting to flash along with the clock on the radio. Its weird. Like it isnt just flashing on and off, its flashing like it doesnt have enough power.. I've noticed it does it more often when I've got the lights on and I hit the brakes. But it doesnt seem to be running low on volts on the gauge. Other than the gauge goes down just barely when I roll the windows up and down and move the mirrors around.. Is it just another thing that I am paranoid about or is it really a problem like a battery or alternator?