what would cause a coil not to spark? all ignition parts were replaced appr year ago.car sat as long while worked on and life obstacles.tried starting to test brakes turns over checked coil output with spark plug no spark.i have 6+ volts at +on coil to neg battery post.across coil about 2v with key on,i put jumper from -on coil to neg post of batt.still no spark at cranking.1.3 ohms on coil .anything im missing here?thanks i checked forum and dodge repair book.it is still 6v pos grd