Troubleshooting Engine will not crank Safety switch button not depressed Be sure deck is disengaged all the way, parking brake is engaged and operator is sitting on the seat. Battery is installed incorrectly The battery must be installed with negative terminal attached to black ground wire. Charge battery fully before installing.
Battery is weak or dead Check fluid level in battery.
If fluid is low, fill to just below split rings with water. Charge battery fully. Blown fuse Replace with an automotive type fuse. Check for loose connections in fuse box, bare wires, and pinched wires. Loose engine ground wire Engine should have a black ground wire running from engine to frame or mounting bolt.