Key switch will not engage the starter, however it will work by shorting the posts on the starter relay switch. I have replaced the key switch,starter relay/solenoid, clutch/brake and blade engagement safety switches Did not replace the seat safety switch since the engine when running will shut off when I get off the seat so I assumed it was o.k. HELP!

You likely have a broken wire... do you have a digital voltmeter and know how to use it... or a continuity tester?

You likely have a broken wire....do you have a digital voltmeter and know how to use it....or a continuity tester?

Yes to both and I will check for a broken wire, thanks, sometimes I make things more complicated than they really are!

Yes to both and I will check for a broken wire, thanks, sometimes I make things more complicated than they really are!

Its easy to overlook the obvious when you get in a rush... like seeing the grass getting high and your mower won't start. Happens to all of us from time to time.