The all wheel drive quit working on the grader :Banghead I don't even know were to start looking to fix this thing.
Try checking the fuses, then look for loose wires, making sure your getting proper voltage to everything. I'm no expert, but have talked to quite a few guys that had trouble with these. Usually the problem isn't to serious.
I can't find any loose wires or bad fuses for the front wheel drive maybe it is just the switch on this box:beatsme