How do you know if its clutch switch or wiring?

97' Honda civic won't start and its not the starter...the car starts when a wire (that a mechanic ran from starter to battery) is tapped to the battery and someone is pressing the clutch...so is it bad wiring or bad clutch switch? If its the clutch switch how much do they cost?How do you know if its clutch switch or wiring?WELL IF IT WORKS WITH A BYPASS WIRE HOOKED TO THE STARTER THEN THE WIRING TO THE STARTER NEEDS TO BE CHECKED FOR TO MUCH RESISTANCE OR BEING OPEN OR SHORTED. I WOULD FIRST CHECK YOUR POWER ON THE EXCITER WIRE WHICH ACTUALLY MAKES THE STARTER ENGAGE WHEN YOU TURN THE KEY. ALSO CHECK YOUR RELAY AND FUSE. FOR SOME REASON YOU ARE NOT GETTING POWER DOWN TO IT.How do you know if its clutch switch or wiring?what did the mechanic say/ i mean you were right there/ if he is a mechanic why didnt he recommend a fix? and why not an estimate?