[71scgc]

Is there a control box say, behind the seat?
See if there's some sort of shut off on it. Shut it off. Start the truck. Turn the unit back on and see if it resets.
Is there a start switch in the bucket for the truck? If so, try starting the truck from that switch.
The units sometimes get out of synch. I've had it happen to me many years ago, and I don't recall exactly what we did to clear it, but I seem to remember something along these lines.

Carter