I was driving and the brake light , abs and airbag

Hi, Same problem - with my Hyundai Getz. Thought I'd pummelled the horn too much. However, I'm told that it might be the alternator. Battery completely died and couldn't be charged - AA man cleaned around the alternator ready for new battery, which seemed to work - advised to get new alternator. Didn't! Battery died again few weeks later, but still some power so that I can jump start the car - all lights on! ABS, airbag, brake - you name it! Also, car is brakig itself when driving - this only occurs when all lights are on. Lights eventually go off, and car resumes back to normal driving again - no more bunny hoping a it brakes, and no more smell of rubber. Have read that low power can be a problem for airbag light, and so checking battery, and alternator is a must. My alternator is now being ordered. Hope this helps. If it was anything else let me know.