Thank you, everyone, for the help! Between the wiring diagram, pulling all of the grounds, and power, cleaning everything up well, and putting quality grease (Schaeffer's) on all the connections, it took care of all of the issues we've been having with the track loader for years (lights intermittently having issues, and coolant temperature flashing and beeping at us intermittently). Guessing that the culprit was the ground that goes from the plate by the flywheel to the chassis ground. But they're all cleaned up, and all the crap is pressure washed out of the bottom of the track loader now...