Electrical Issues (maybe alternator)

[caall99]

So today i leave school to go home and see that my brake light is flickering even when i am not touching the brake pedal. Also i hear an odd buzzing noise everytime i hit the brake coming from the bottom left of the dash, close to the fuse panel, but above it. The car also begins to idle slightly rougher than usual. Now i notice that a yellow dummy light in my cluster is coming on evertime i hit the brake pedal, including the battery voltage warning light and the brake light, but all of them are oddly flickering. I check the voltage at my battery and it reads 12.1 to 12.3 volts with the car running. I checked/cleaned all my grounds. I need to get home and i have run out of ideas besides removing the alternator and getting it tested. Any relay or fuse i should be looking at? what else could be the problem?

Thanks

[SoSideways]

Sounds like your alternator or battery is on its way out.

With the car running your battery should read around 14v, not 12v.

[caall99]

turns out it was the alternator. i replaced it with a ka24de alternator. I swapped the pullies ground away some of the excess metal and bored out the top mounting hole. the battery now reads 4.2 volts. :D

[SoSideways]

4.2v?

Or 14.2v?

4.2v = only your clock in the gauge cluster will work (what's happening with my car)

[caall99]

oops, correction: 14.2 volts. the alternator seems to come on irregularily tho, which is kind of odd, what else could be going on? maybe something else on my car?