[34dohc]

Try removing the positive battery terminal and clip a voltmeter that reads dc volts between the battery (+) terminal and the (+) battery wire, in line. check to see if there is any voltage being drawn through on the meter while everything in your car is turned off.This is called a parasitic drain test. dont forget about the underhood light if you have one. If there is a draw, remove one fuse at a time until you get almost a zero reading because of things like clock/radio, alarms and such. if you can get this down to zero and still cant get it to start, I would check your pos and neg battery cables with a voltmeter (ohms) or possible corrosion between contact surfaces. I would probably check the battery cables and connections first only because its easier.