Electric Start Toro not working

there should be a switch next to the battery. if it's blown replace it. try testing the new battery it could be bad. I know it sounds stupid but it happens. if that checks out ok. if it is grounded check the grounding wire connection and the wire hooked up to it. if that's good. I know u did this, but check the switch for continuity. if that's good I would say it's the two wires connecting from the switch, to the battery. disconnect both ends, and check each wire with a continuity tester. if everything else checks out okay, I would say its those wires. also make sure there making a good connection. an gently shake the wires as you test for continuity. if it intermittently sounds. that's your problem and replace that wire. hope this helps. good luck.