A few things on this model throughout the years that I found. The FIRST thing to check is that the brake linkage is pushing the brake switch all the way in. The switch is behind the plastic cowling below the battery. The linkage rod relaxes over time and doesnt push in the switch all the way. I usually just bend the linkage forward a bit so it pushes the switch. That has been the majority of my fixes. I've run into a few bad brake switches over the years as well. Another common issue I found is if the battery cable has corrosion up under the casing or in the terminal crimp. If all that looks good, run a hot wire from the battery to the spade terminal on the solenoid. Make sure your PTO is off because this will bypass any safety features! When you touch the wire to the terminal on the solenoid, she should crank no matter what the issue, unless your solenoid is bad. There is also a possibility that you're losing a little voltage through the aged switches and need to install a starter relay kit. They are simple to install. Reply back if any of this worked. Good luck!