Getting power but it won't go forward or back.

Getting power but it won't go forward or back.

Our E-Z-Go 2009 ST Custom gas golf cart was working fine. We stopped for an hour or so, turned the key on, hit the accelerator to back up, it engaged and then stopped. The lights and gauges still work. We've checked the wiring but don't see anything obvious. Any suggestions on what might be wrong?