Ok, I also have a 36" scag w/b with 15 kohler that I cant get the blades to engage. I am a mechanic and am completely baffled. The clutch fried Connected directly to 12 volt battery, wouldnt even click. Ohmmeter showed bad. Ordered new clutch, installed and before plugging it up, I started the mower and was getting 38 volts at plug. checked the rectifier and it was 38 Ac on one side and 46 on the other leg ac. Showed ac on the middle plug on the rectifier. Figured the rectifier bad, replaced have about 13.6 volts DC now. plug up clutch. No go. Pto Switch ok also. Any one got any ideas??