A few days ago my cart stopped then started again. I checked water level in batteries and found them low. I towed cart to garage where batteries were topped off and charger attached. Charger shut off the following day. Batteries were all reading 8.23v. Went to use cart today and it does nothing, but batteries are still at 8.23v. Any suggestions on troubleshooting this problem? Run-tow switch is in correct position.