To disable the Auto Sleep lift the hood and near the tool box closest to the engine you will find a Black Box/Computer. In one of the heavy wires attached to this box you will find a fuse holder. It is black rubber maybe one inch square. Open it up and remove the spade style fuse, Close the fuse holder up and it is disabled. You are now in control of the machines cutting ability. Should you ever want to enable it just put the fuse back in the holder.
AMMIX, don't know if you remember or if this helps, but this was in the upgrades to SC252 thread. Are you in the right place and right wire by this decription?? Mine of course doesn't have the box in there so I can't help there, but I would make sure you didn't get the wrong one.
I still really need someone with an older machine or service manual to take a picture of their clutch switch or wiring diagram for my messed up switch. You were right on yours being too new for me. Is Plyscamp, Apextreeservice or Stumper63 still around here??