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You may or may not need to replace the battery. To check if it is a drain from one of the systems on your car; unhook the battery overnight and see if it kept the charge till morning. If it is still charged in the morning then it is not the battery.
Put a voltmeter on the battery. With engine off you should read 12.0 volts. Engine running you should read between 13.7 volts and 15.1 volts. Problem could be Battery, Alternator or Regulator.
Connect a 12 volt DC test light between battery cable & post on positive terminal.(remove terminal) (inline) When that light is on, there is a draw. Radio memory, alarm/antitheft systems, etc will cause a draw, so make notes & pull them first. Light will be dull on low draw, bright on high draw. Watch light closely & start pulling fuses, when you see it dim down,or go off you;ve found a draw. If no change, put it back in & continue. I usually start with the suspected draw spots like listed above, and accessories fuses.(like a cigarette lighter stuck in.) If all else fails, I've had to remove all the fuses then start replacing one at a time, until light gets bright, to point me in direction of major draw. Don't be proud, if you don't think it's labeled well enough for you to remember where they all go, make your own drawing & notes. Keep me posted of your progress.
i found it best to remove radiator first before trying to tackle the alternator... once that is removed then you can easily get to it to unloosen bolt and swap
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