It is not uncommon for a safety switch to get misaligned and not work correctly, also it is not uncommon for a switch not to work even if it is engaged.
You need to check all the switches that must all be properly aligned and engaged in order for the engine to start. As for the light blue wire, I am not sure 100% however typically blue wireds on wheel horse equipment are used in the ignition system. Depending on your model it may be the main ignition power line which runs from the ignition switch (S) connection or (start) connection, then goes to PTO interlock switch, then goes to the Pedal interlock switch, then finally to the starter solenoid. Which sounds like where you have to look because along this blue wire at many points and switches, there is a problem either with a connection (the lose blue wire) or a bad interlock switch along it's way to the starter solenoid. You should also check the PTO interlock switch because it also is connected to a kill relay that will prevent the engine from starting id it is faulty (that light click your hearing, the starter solenoid would be a louder click).
There is a typical ignition service manual available at
http://www.mywheelhorse.com/graphics/file/Engines/Engine-Electrical_Service-Manual.pdf It has the typical wireing diagram and all the information you will need presuming you have enough electrical background to use a multimeter.
The website at http://www.scribd.com/doc/47347708/Toro-wheelhorse-Demystification-Electical-wiring-diagrams-for-all-WheelHorse-tractors has diagrams specific for each model but you have to make an account (free) to use the website, and lastly the website http://www.mywheelhorse.com is a invaluable website for anyone who owns a Wheel Horse. Let me know what you figure out!
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