Hi Steve, The links below might help mate.........CHEERS..
How to test a lawn mower Key switch....
https://www.youtube.com/watch?v=q8G7kxCl9hY&nohtml5=False
How to test lawn mower key switch
How to test a solenoid....
https://www.youtube.com/watch?v=MsvJMnpQBas&nohtml5=False
How to test lawn mower solenoid
How to test lawn mower electrical safety switches.... https://www.youtube.com/watch?v=Xi3p465MN1E How to test lawn mower electrical safety switches
Shows all safety switches disabled....
https://www.youtube.com/watch?v=l1nQO3bhlTw
Disable all lawnmower safety switches