O. K. In 1954 production ended for the model 77 tractors and production started in the fall for the Super 77 tractors. One of the features of the Super 77 tractor was the group 3 Hydra-lectric. The switches that work that unit are internal. The fleetline units are mounted on the steering collum.  Is this a diesel? If the unit was wired properly, there would be no power to the switch(S) with the key off. So since I am not sharpest tack please explain some more: Picture serial number? etc.