I have an update on post from yesterday about the Ag Leader Incommand 1200 shutting off when applying anhydrous ammonia.
After reading the responses last night, I knew it was over my head. I called my local tech. He came out this morning and proceeded to check things out. He found the issue quckly. One battery was putting out 11.7 volts. The other battery was putting out 9.6 volts. The tractor started with no problems. That was not enough voltage to properly run the Ag Leader equipment. 2 new batteries fixed the problem!! It worked fine all day.

I feel silly but learned something today about making sure there is the proper voltage to operate GPS equipment. 
Thanks for the responses to help guide the way.
Jim