Remove the positive cable from the battery and check the continuity from the loose cable end to the chassis or motor. There should be no continuity with the switch turned off. If you don't have a volt/ohm meter (multi-meter) to test for continuity, try touching the loose battery cable-end to the empty battery post. If there is a spark, a short somewhere is draining your battery. If there is no continuity the most likely thing is that your voltage regulator isn't working or you are not getting voltage generated, causing the battery to run down. The tests I mentioned are assuming that you don't have a clock or something else that are constantly on. If you do have a meter, you should be getting a reading of 14 volts, more or less, between the plus and minus terminals of the battery with the motor running.
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