An improved general aviation igniter cable assembly includes either a single or double coil spring. The double coil spring has inner and outer portions. The outer portion has first and second ends. The first end rotatably engages the cylindrical recess in the ferrule. The outer portion surrounds the first end of the grommet with the second end bearing against the retainer. The distal end of the inner portion is located within the outer portion and bears against the first end of the grommet to put pressure on the spark plug contact button. For the magneto end of the cable, a sealing grommet fits slidably over an insulating sleeve of the cable and seals against a magneto plate when a surrounding threaded nut is tightened into a collar of the magneto plate and the plate is attached to a magneto, providing an airtight seal to the magneto plate and the magneto.