I'm trying to repair a 1999 Yamaha golf cart that isn't running and have some questions. I changed batteries, controller and solenoid but the cart still won't run. If we jump the small post of the solenoid it will move but if we jump the 2 big post nothing. I found that most of the white corrosion on the connections have been rotting away at the battery cables so we have also addressed that problem. Where do go from here on getting this golf cart repaired?