Having a no start issue with my 88 5.0. I put the key in and I get the normal "door open key in ignition" tone dome light on everything normal. Turn the key to accessory and everything still normal. As soon as I turn past accessory into "run" I loose almost all power. Door tone stops, dome light out, gauges dead. Only a slight noise from the back that sound like my fuel pump but weak. I have clean terminals and a good battery. I have already replaced the ignition switch also. I am not an electrician. This issues happened suddenly and without warning. Been a clean good running car for years.