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In Reply to: Re: JD STX 38 mower - turn key, it clicks but won't start. posted by Jason on Monday, April 14, 2008:
With the starter motor installed, and connected up to the solenoid as if you were ready to start it, do the same again. Power up the small terminals. It will click again, and should crank the engine regardless of all the other switches. If it does crank, then the problem is in the wiring before the solenoid. If it doesn't crank, the problem is in the solenoid. Sometimes they click, but the big terminals don't bridge properly internally, so it sounds like it works, but it doesn't make contact.
The only other switch besides what you have mentioned is the PTO switch. If this has a problem with it, it functions much the same way as the other safety switches. The switch must be off to start the engine, but when they are bad, even though the switch is off, the contacts in the switch still make it think it is on, and it will not start.