Was mowing yesterday for about 50 minutes when mower just stopped. Won't restart, no voltage showing when turn key. Tested the battery & its perfect. Any suggestions. Please

Hi,
Sounds as if you blew the fuse. This would affect voltage at the switch, which in turn would close the backfire solenoid shutting off fuel flow. Possibly a bare wire somewhere. The rear harness is what I would check first. Area of interest would be the right rear side of the frame.
Peace,
Clarke