After fighting for the last week to track down a short, I finally found it late last night. This a.m. I started the car and it ran great, but for some reason with the key in the off position power stayed on (the car even kept running until I closed the choke plate)to the coil and I came back to the car 10 minutes later to find the coil exploded. Thinking it was the ignition switch I went to my local used parts guy (if you need any used mustang part he probably has it)and got another coil and a replacement ignition switch. Tonight the car starts, runs, and turns off the way it should, but when the key is in the on position I have current going through the coil wire and also through the brown ignition wire that runs off the small I post on the starter relay. It would make sense to me that in the on position current should be running through the coil wire to provide current for the spark, but I thought the brown wire was only supposed to have power when the key was moved to the start position. Is that correct or incorrect? I just don't want to run it if it is going to fry something else if there is a problem but I don't understand enough at this point about the coil wiring to know if this is right or wrong. Any electrical gurus out there tonight?