I have a Scag Cougar with a 20 hp Kohler, and 48" deck. The blades will not engage. I have tried replacing the switch to engage the deck. Also, I have traced the wires to examine for broken insulation or disconnections. Using a test light I have found that both wires on the clutch are producing a ground. I traced the wires back to the fuse on that line and it is producing a ground as well. Are the wires on the clutch supposed to be grounds, or hot, or one of each ?? Any help would be appreciated!!!