Chances are your charger is just fine. Golf cart batteries will discharge to a lower voltage when not used for extended periods of time (months). Golf cart chargers will look for a minimum voltage before they activate or turn “on”. Therefore, if you know the golf cart has been sitting for extended periods, measuring the voltage should give an indication if this low voltage issue is occurring. If low voltage is determined, each battery will need to be charged on its own by another type of charger (bench charger) or if you can get the golf cart or batteries to a reputable battery specialist, they can charge it for you. However, please be aware that age of batteries can determine if the batteries can be salvaged with a charge!