I have a John Deere RX75 riding mower, and the starter sometimes refuses to "turn over" -- no click, no sound, nothing when I turn the key. The problem is intermittent; sometimes it fires up just fine, and sometimes it doesn't.

A dealer replaced the voltage regulator last year when I had the same problem. I've fiddled with the gearshift to make sure it's in neutral, checked all wiring that I can see, and all the other obvious things that occurred to me. Any ideas or guidance?

I realize this is a new post about an old problem. I got no responses on a post from a couple of years ago, so I figured I'd start fresh.

Thanks to all for any help.