With a full battery and all connections cleaned and tightened, when I turn the key the starter is not engaged. If I short out the two large poles on the solenoid the engine turns over so there is some issue of power not getting through. Using a meter I get over 12V to battery connection pole on the solenoid and to the small white wire above it when I turn the key. I've replaced the solenoid and have confirmed power going through the Clutch/ Brake and Attachment Clutch switches. Not sure how to check the seat switch since it is ground and has two black wires on one side of the switch and one on the other side. I've replaced the 20 amp fuse. I have power to the starter switch on points B and S. Any ideas on what further I should check?