I have a 2007 turf tigger with 27hp Kaw engine on it,will not start with switch but can jumper the the solenoid and will start. I have done the following replaced modgule and relay, checked all 4 safety switches and they are ok. I checked the switch and have a circut when i hold it in the start position. I am at witts end as to what the problem is any help or suggestion would be appreciated.