Alright i am kind of confused. I've been through 2 optima yellow tops in 3 years. I understand that i might have alot hooked to the battery like 2 amps, sub, and alarm system. But one day i came to my car and all the lights, alarm chirping and everything worked but when i tried to start the car it was nothing, not even trying to turn over. So i started thinking it was the fuel pump that went bad. So i purchased a new fuel pump(haven't installed it yet) and now i'm thinking i need a new battery because the battery wasn't giving a charge or anything at autozone. So what do you all think the problem is?? I hope it's not the alternator. :?