Thanks to all who have commented in the past couple of days. Been looking everything over and checking things out on the tractor. Basically, it's only supposed to beep if it's left in gear, the PTO is engaged, or the brake is not set...after turning off the ignition. None of these apply and yet it continues to beep intermittently at all hours of the day and night. Sometimes it is silent for hours on end, then out of the blue, it will start chirping away again; eventually stopping again. Of note might be the fact that sometimes, the beeping is not consistent in that sometimes it will beep 2, 3, 4 short beeps and other times it will beep 8, 9, 10 beeps in a row; stopping for a few seconds/minutes, then starting again not following any consistent pattern. Still baffled.