My 2002 Hyundai Accent battery keeps dying. I got a new one yesterday and had it fully charged and this morning my car was completly dead. I'm not sure what is it that is draining my battery. I just had my alternator replaced and check at AutoZone and they said it was good. That nothing should be draining my battery but something is. Can you please help me out. Thank you!

SOURCE: 97 hyundai accent no headlights or heater fan

Under the dash fuse box ,fuse 15 (TCM ECT) is a combination of cluster, heater and headlights.probably a relay fuse!!!!! fuse 16is a relay fuse.

SOURCE: I have a 2002 hyundai accent. I just replaced the

It really sounds like maybe that alternator is bad. You can get it checked at a local parts house like an AutoZone, Advance or Pepboys. They can check the voltage at the battery with the car running, it should be above or around 14 volts, if it is lower then the alternator is not working properly. You should call and check to see if there is a warranty on this alternator if it went bad so quickly, but every shop and parts manufacturer has different warranties.
I can't say that that brake light is directly related to this but you should definitely check and make sure that the fluid level in the reservoir is at the proper level. The brake fluid reservoir is under the hood on the drivers side of the car right up by the firewall (the wall that separates you from the engine bay). It is usually a cylindrical container. You should see Max and Min fluid level marks. Make sure the fluid is in that range. If it is not you make need some brakes replaced. If the fluid level is fine it may be related to the fact that the battery is running low voltage, car computers get wacky when they do not get the proper voltage to them.