Thanks for the information. I will test it Sunday. I needed to run the tractor yesterday and today, so I haven't been able to work on it. Thanks to everyone for your help.
The parking brake safety switch was working fine and suddenly quit. The tractor quits when I get off. I looked and the switch is not touching the the metal bar any more to engage the safety when I put the parking brake on. It isn't loose but it isn't far enough forward to hit the stop bar...