A update, my problem was a loose spade connector on the starter. My 1st pass around , it look like it was secured but I did a 2nd full check of components.
I'm going to blame my cats on this, they been playing and crawling around my tractor. I bet they where on the loader arms and climb down...
Please update us on what you found. I'm tracking the same thing down now. workmaster 50 2016 model. I've pretty much tested ll switch ( operator presence , clutch pedal , and neutral switch on left side of the tunnel )
I'm going to retest the clutch-switch since the plunger feels like it'...