I have manually charge each of the batteries so that the cart runs. When I plug in the cart charger, it won't register and won't charge the cart. I have cleaned all terminals, cables and battery maintenance just before the last charge. The batteries were drained really good as I was playing 27 holes and did not complete 14 before I lost power. I assume, that as I was charging the cart overnight, the charger never activated. I plugged the cart in at the golf coourse using another ez go charger and my cart did not charge, but when I used that same charger on another cart, it started charging the other cart. To get my batteries charged I used the 12V charger that I use for my trolling motor, but I charge two golf cart batteries at at time in a series of 2.