trying to help a friend out with zero turn 27h.Was parked after mowing when returned unit would not start ( no crank).I have bypassed all safetys brake,seat,both steering arm switches,replaced time delay module and pto switch and still no crank. With a 12v jumper and ignition on can touch start terminal on switch and start unit.You can check voltage at this terminal without jumper and see 12v and hear both relays clicking with no reaction at starter.I can also jump starter solenoid and start unit . Suspecting ignition switch but not adding up for there is 12v there now at start position am i missing a safety switch ? Any help greatly appreciated !