Go to Harbor freight and buy your self a 100 amp load tester, a hydrometer and a voltmeter. Test each battery, fill with distilled water each time you charge it. If a battery is using water most likely it is a bad battery. Don't drain a battery more than 50%. Don't recharge a hot battery, wait for them to cool down first. If need be, remove the batteries and charge each with a 6v charger or put two batteries in series and charge two of them with a 12v charger. Most golf cart charges charge at 20 amps for 12 hours or more. Load test each battery, hydrometer test each cell, clean all terminals and coat them with a grease that prevents corrosion. Remove any battery that fails the load test or hydrometer test. All batteries must have the same electrical properties, amp hour, capacity and volts. Make a wiring diagram before you begin removing wires. Take a pic too.
When your charger is on, the total output voltage is 3-4 volts more than 36v on the older golf cart and same for newer 48v carts, 3-4 volts more.
Had a charger go bad and it melted the insulation off transformers secondary windings and the output was only 2vdc.
Diodes go bad and many times the electronic brain box that turns the charger off goes out or shuts off too soon. By pass the brain box and see what the output is. Put your charger on a timer and charge it for 12 hours at a time and do hydrometer checks checks on each cell.
Good luck. If you can't do the above, move to a retirement village and the retired people can show you how to keep a golf cart going.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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