Does anyone know what would cause a short to ground only when the ignition switch is turned on? Also the short is in the #1 50amp fuse terminal in the PDC which runs into the cab to the instrument cluster. I am curious to know if maybe the cluster is bad or maybe the ignition switch is causing the problem, I am not to sure but I am going to keep trucking ahead with the voltmeter and see what I can find. Maybe someone has an idea! Thanks