Keep going through batteries

For some reason there is a constant drain on the battery of my 2003 Olds Alero 3.4L. If it is driven every day there isn't too much of a problem as long as I drive it long enough to charge the battery. If it sits for a couple days the battery is dead and I have to charge it up to get it to turn over. Then there's the problem of getting it started ... don't know if it is the fuel pressure regulator or the relay for the fuel pump. It's a nightmare operating this car. Once its running it's a fun car to drive .... it's just getting it to that point that's such a drag. So what is draining my batteries ..... anyone have any suggestions? I don't want to just start throwing money around .... cuz it's a 2003!!
I woke up one night and saw the head lights flashing on and off all by them selves, I went down stairs and turned them on and off again... well I put it back to "auto" any ways as there is no such thing as "OFF" on this car. I did replace the hazard light switch as the blinkers gained a mind of there own as to when they'd work and when they wouldn't... but I still hear the darn unit clicking intermittently even though none of the turning lights/hazard lights are actually on. The hazard light unit relays are a clicking away off and on for no good reason in spite of the fact it's a brand new unit.
So again what can be draining my battery down, it's getting expensive replacing them? I'd like to sell this thing and put all the problems onto the next unsuspecting "fool- enough- to- buy- an- Alero" ... but I simply can't do that in good conscience, any help would be greatly appreciated.
I woke up one night and saw the head lights flashing on and off all by them selves, I went down stairs and turned them on and off again... well I put it back to "auto" any ways as there is no such thing as "OFF" on this car. I did replace the hazard light switch as the blinkers gained a mind of there own as to when they'd work and when they wouldn't... but I still hear the darn unit clicking intermittently even though none of the turning lights/hazard lights are actually on. The hazard light unit relays are a clicking away off and on for no good reason in spite of the fact it's a brand new unit.
So again what can be draining my battery down, it's getting expensive replacing them? I'd like to sell this thing and put all the problems onto the next unsuspecting "fool- enough- to- buy- an- Alero" ... but I simply can't do that in good conscience, any help would be greatly appreciated.
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