evfan, a lot of good advice so far. To expand a little, check the small belt to the starter/generator and make sure it is tight. Next if you have a digital meter, set for 20 VDC and connect to the battery terminals should read close to 12.5 VDC, place the golf cart in neutral, and start the cart, at medium RPM, the voltage should go to 14.5 VDC for charging. Final test, disconnect the positive battery lead, set your digital meter for AMPS start at the 5 to 2 amp range, and connect the meter between the battery positive terminal and the positive battery lead, if you get a reading you have a parasitic load. Start removing the fuses one at a time until you find the source of the drain. The repair of the parasitic drain will depend on what is causing it.
Hope this helps.
NOTE: I have the equipment and expertise to help you if you do not, let me know.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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