Every once in a while I would turn the key and there would be nothing, letting off on the key and trying again the starter woud crank, and engine ran. This problem became more frequent and now will not even click at the starter. When I turn the key to "ON" I hear a mild click that seems to be coming from the plug at the electronic mower clutch. I have checked all the safety switches by un-plugging one at a time and jumping the plug with a piece of wire. Also un-plugged ignition switch, mower switch, fuse block. I haven't un-plugged the mower clutch wire. I am not a major motor head, but understand the basics. What's wrong?