Alright, I have tried searching but I can not find anything similar to my issue. My 87 5.0 will not start and any of the items that run when the key is in the on position will not work. At first I thought it might have been a fuseable link but I got to checking things with a multimeter and I have power to both of the yellow wires going into the ignition switch when the key is off. However when I turn the switch to the on and crank positions I lose all power to both wires. If it was a link there would be no power at anytime correct? Is it the ignition switch itself? I am about to run myself crazy studying wiring diagrams and trying to figure this out. Please help asap as I need to get this thing started again so I can finsh troubleshooting other issues.