I have a 1996 Cobra Mustang,the starter clicks. I have checked the battery, replaced the starter and had it bench tested. I checked the starter relay ire thats close to the battery, I took battery cables and jumped them down to the ignition module under the dash.Could it be my anti theft alarm or my clutch pedal position switch??
Try the coil and see what happens it seems that's the only thing that you have t tried, I guess at this point it's worth a shot.