I have a Hyster S50XL Truck that has run fine for years. Today there is nothing, no click, no nothing. Battery is up, installed a new ignition switch this morning, parking brake safety is working. There is no seat safety on the truck. I can make the starter work, but no fire to the coil. It's like there is a wire that is not connected. One day it works great, the next day nothing. Can you help me with some advise on the starting circuit so I can continue to diagnose the problem.