my car battery died yesterday night.., what happend? Options

[yellowxboy]

yesterday night i was out with my gf .. after dinner we went back to her place to take a nap and when we decided to go out for some coffee, my car wouldn't start. all the lights were very dim, my guages didn't light up, it made a faint clicking noise when i tried turning the key but the motor didnt even move.

at first i assumed the battery died, but i just bought the battery not too long ago (5 months i think). my friends came over to jump start my car and everything is back to normal. my gf's dad thinks that the alternator is old and that i need to buy a new one because it is draining my battery..

any suggestions? i want to get a general idea before i bring it to a machanic to get it fixed.

[ i didnt leave anything on while my car was parked, i have 2 subs that are powered by a 900 watt amp, i rarely turn on my glow lights. but i do drive with my lights on in the morning.. could that be a reason why it drains? ]

[Mynzeyes]

you can have autozone check your alternator to see if it's good or bad...just take it off, and run up there when you go to get one and have them check it. .