Please check for a blown fuse. Your description of symptoms is consistent with a blown main fuse.
If you do not find the fuse to be blown, we need to test your ignition key switch. Do you have a 12 volt test light or a volt meter?
On other bit of maintenance you can do that might expose the problem is to check and clean the negative battery cable contact location where the negative cable attaches to the frame or engine. Find that location and remove the bolt holding the cable in place. Then clean off the cable end and the frame where the cable touches. Reassemble using a new bolt if the old one is rusted much.
If that does not help, refer to the fuse and key switch suggestion. Post back your situation.

This one drove me crazy, but I found a wire that had corroded away from the connection from the key switch into the main harness....odd for a tractor w/ only 88 hrs.....glad I found it though, thanks.

hope yer not in the habit of either storing the machine in outside weather... or washing/hosing it down with a garden hose or power washer.. can cause all sorts of corrosion probs.